Events Archive

Spring Meeting of DPG Section “Atome, Moleküle, Quantenoptik und Plasmen”

Institutsseminar

Detection Schemes for Vacuum Birefringence With a Case Study for PW-class Lasers and Optical Probes

Dr. Stefan Ataman
ELI-NP, Bucharest

Abstract:

The still to be tested predictions of quantum electrodynamics are the ones stemming from the non-perturbative regime described by the Heisenberg-Euler (HE) Lagrangian [1]. They include  phenomena such as light-by-light scattering [2], light splitting [3] and vacuum birefringence (VBir) [4]. The latter is addressed in this talk. The theoretical as well as experimental efforts in order to measure VBir are briefly detailed, including the magnetic field-based experiments as well as the x-ray and γ-ray probes with petawatt (PW) laser pump proposals. We elaborate on the feasibility of an interferometric, all-optical, Mach-Zehnder-based VBir experiment [5]. The experimental proposal is based on a pump-probe configuration combining a 10 PW pump laser and a lower power pulsed probe beam. Taking into account realistic pump laser parameters (30 fs pulse duration and a focus waist 3-5 µm), for a nearly counter-propagating probe laser beam the ideal probe duration is found to be significantly longer (100 to 700 fs), thus allowing a lower minimum required probe power. We discuss in detail an experimental scheme able to implement the required pump-probe interaction geometry. In order to mitigate the undesired effect of mechanical vibrations,  we also put forward an automatic compensation mechanism, able to significantly reduce this unwanted effect. Finally, we discuss avenues of further improvement via the employment of non-classical states of light for the probe beam, namely the coherent plus squeezed vacuum input. Given today's technology, keeping the same probe power and employing the squeezed vacuum input leads to an improvement of one order of magnitude in the expected interferometric phase sensitivity.

[1] W. Heisenberg and H. Euler, “Folgerungen aus der Diracschen Theorie des Positrons”, Z. Physik 98, 714 (1936).

[2] R. Karplus, M. Neuman, “Scattering Processes Produced by Electrons in Negative Energy States”, Phys. Rev., 83, 776 (1951).

[3] Z. Bialynicka-Birula and I. Bialynicki-Birula, “Nonlinear Effects in Quantum Electrodynamics. Photon Propagation and Photon Splitting in an External Field”, Phys. Rev. D, 2, 2341 (1970); F. Karbstein, “Probing Vacuum Polarization Effects with High-Intensity Lasers”, Particles 3, 39 (2020)

[4] J. J. Klein and B. P. Nigam, “Birefringence of the vacuum”, Phys. Rev., 135, B1279 (1964).

[5] S. Ataman, “Vacuum birefringence detection in all-optical scenarios”, Phys. Rev. A, 97, 063811 (2018);  “Vacuum Birefringence Measurement via All-Optical Interferometric Schemes”, J. Phys.: Conf. Ser. 2494 012019 (2023); S. Ataman  et al., “All-Optical Vacuum Birefringence with PW-Class Lasers: Case Study for the ELI-NP Parameters”, J. Phys.: Conf. Ser. 2894 012020 (2023).

Institutsseminar

Technology and Science at the European XFEL

Dr. Harald Sinn
XFEL, Hamburg

RS-APS Seminar

Material-Specific and High-Resolution Imaging Using Extreme Ultraviolet Ptychography

Wilhelm Eschen
IAP and Helmholtz-Institut Jena

Institutsseminar

Digital Twins of Laser Plasma Simulations

Dr. Michael Bussmann
HZDR, Dresden

Institutsseminar

High Energy Density – From Alien Worlds to Energy and New Materials

Prof. Dr. Dominik Kraus
HZDR, Dresden

Abstract:

The interiors of planets and stars exhibit extreme conditions: High temperatures and enormous pressures create environments which are poorly understood and hard to encompass for established physics models and difficult to recreate and probe in the laboratory. New theoretical and computational developments in combination with new experimental capabilities provided by high-energy lasers and X-ray free electron lasers now finally allow for detailed studies of matter at megabar to gigabar pressures. This will substantially improve our understanding of planets and stars. At the same time, highly interesting new materials, such as “better diamonds”, may be formed via peculiar chemistry at high energy density conditions. Finally, creating states comparable to stellar interiors in the laboratory may also allow to harvest nuclear fusion, the energy source of the stars, on Earth. I will present a showcase of our recent highlight results and provide an outlook for future developments planned for the new High Energy Density Institute (HEDI) in Rostock.

Annual Meeting of the ErUM-FSP APPA 2025

RS-APS Seminar

Compton Polarimetry up to 1 MeV

Tobias Over
IOQ and Helmholtz-Institut Jena

RS-APS Seminar

Preparation and Realisation of first Dielectronic Recombination Experiments at CRYRING@ESR

Esther Menz
GSI and Helmholtz-Institut Jena

Institutsseminar

Accessing the Ultrafast Time Domain Using Coincidence Measurements

Prof. Dr. Till Jahnke
University of Frankfurt

Abstract:

Recording real-time movies of dynamical processes in molecules, as, for example, progressing chemical reactions, has been a driving force for many disciplines in fundamental sciences during the last decades. Comparably new are experimental techniques, that address single molecules in the gas phase and that involve coincident single-particle detection for imaging these dynamics are Coulomb explosion imaging and Photoelectron diffraction imaging. The latter employs the interference pattern of (photo)electrons emitted from molecules to infer the initial molecular geometry, the former uses (for example) ultrashort light pulses to (heavily) fragment the inspected molecules in order to gather such information from the breakup pattern. X-ray free-electron lasers are able to produce ultrashort light pulses with highest intensity, which are perfectly suitable to perform measurements along these lines. In particular, these light sources allow for time-resolved studies in a pump-probe scheme by adding ultrashort UV pulses that are synchronized with the X-ray flashes.

Since almost five years a dedicated COLTRIMS reaction microscope [1,2] is available at the SQS-instrument of the European X-ray free-electron laser, which was used recently to perform Coulomb explosion imaging (see Fig. 1) and Photoelectron diffraction imaging measurements. Some examples will be presented in the talk. The COLTRIMS technique is a powerful coincidence measurement approach, which allows in addition to examine in some cases molecular dynamics on a femtosecond time scale without the need for ultrashort light pulses. The talk will present some examples of synchrotron-based measurements along this theme, as well.

RS-APS Seminar

Energy Scaling in Compact Multi-pass Cells for Spectral Broadening

Nayla Jimenez De la vega
DESY and Helmholtz-Institut Jena

Institutsseminar

Laser-Plasma Accelerators: Particle Acceleration in a Nutshell

Prof. Dr. Matthias Fuchs
KIT, Karlsruhe

Abstract:

High-power lasers, relativistic electron beams, ultrashort X-ray pulses, plasma accelerators … Oh My!

In this talk I will discuss laser-plasma accelerators – a novel technology that has the potential to become the next generation of particle accelerators.

Particle accelerators are key drivers for research and innovation and while mostly hidden from view, they have enabled many scientific discoveries and technological breakthroughs that have changed our way of life. However, they are often costly and high-energy machines are kilometer-scale facilities of which only a few exist worldwide.

Laser-plasma acceleration (LPA) can shrink the cost and dimension of accelerators by nearly three orders of magnitude compared to current technology. In LPAs, an ultrashort high-power laser is focused into a plasma, where it generates a plasma wave in its wake. Electrons can be injected into this plasma wave and are accelerated by its massive electric field to relativistic energies over a distance of only a few millimeters to centimeters.

I will present an overview of the field of laser-plasma acceleration and its current state-of-the art, introduce some applications of LPAs, including compact X-ray sources, and give an outlook over future developments.

Elfte gemeinsame Lecture Week von RS-APS und HGS-HIRe

Machine Learning from scratch

RS-APS Seminar

Comparison Between Velocity and Length Gauge in Strong-field Approximation Under Partial-wave Representation

Kefei Zou
TPI and Helmholtz-Institut Jena

11th International Conference on Nuclear Physics at Storage Rings (STORI 24)

Institutsseminar

Photoionization with Shaped Femtosecond Laser Pulses

Prof. Dr. Matthias Wollenhaupt
University of Oldenburg

Abstract:

In this talk, we demonstrate the manipulation of the 3D photoelectron momentum distribution (3D PMD) by multiphoton ionization (MPI) of atoms with polarization-shaped femtosecond laser pulses. After introducing the physical mechanisms of the coherent control of MPI, we present recent photoelectron tomography measurements from perturbative and non-perturbative MPI. Experimental results on the generation and manipulation of free-electron vortices with single-color and bichromatic polarization-shaped pulses will be presented, together with a novel Fourier-based analysis technique to extract the quantum mechanical phase of the 3D PMD. The latter provides insights into the underlying dynamics of the MPI. In addition, we present the first experimental demonstration of shaped electron vortices (SEVs), created by perturbative and non-perturbative atomic MPI with oppositely chirped, counterrotating circularly polarized (CRCP) pulses and study the absorption delay in (1+2) resonance-enhanced MPI using transform limited CRCP pulse sequences. Finally, we investigate and control ultrafast spin-orbit wave packet dynamics in the potassium 4p fine-structure doublet using bichromatic pump-probe sequences.

Institutsseminar

Fragmentation Mechanism of Molecular Dimers Induced in Ionizing Collisions

Dr. Xinwen Ma
IMP Lanzhou

Abstract:

Based on the Reaction Microscope in Lanzhou (ReMiLa), the fragmentation of Van der Waals cluster clusters of N₂Ar, ArCH₄ and hydrogen-bounded cluster of C₂H₂-C₂H₂ induced by charged ions (Ne⁸⁺, He²⁺) and electrons have been studied. New fragmentation mechanisms will be reported which are found in the fragmentation processes. Such as heavy ion transfer, proton transfer, and ICD induced break-up of molecular covalent bond. The finding of these new mechanisms enriches our understanding of the microscopic mechanisms of molecular and cluster dissociation fragmentation and provides insights for developing new cancer radiotherapy strategies.

Institutsseminar

High-Intensity Laser Plasma Theory

Dr. Daniel Seipt
Helmholtz Institute Jena

MT Annual Meeting 2024

21st SPARC Topical Workshop

The 21^st SPARC Topical Workshop will take place between 6th and 10th of September 2024 in the lecture theatre Angewandte Physik Hörsaal of the Münster University, Germany.

21st International Conference on the Physics of Highly Charged Ions (HCI)

15th International Symposium on Electron Beam Ion Sources and Traps (EBIST2024)

Institutsseminar

Observing Ultrafast Molecular Energy-Conversion Using Free-Electron Lasers

Prof. Dr. Markus Gühr
DESY and University of Hamburg

Abstract:

At the center of this talk is the conversion of light energy into other forms of energy in molecules. Many light-energy conversion processes in nature occur on an ultrafast (sub-picosecond) timescale, such as retinal light harvesting, optical switching of green and yellow fluorescent proteins, and nucleobase photoprotection. To fully monitor and understand the ultrafast dynamics of a molecule, combined knowledge of two realms—nuclear geometry and electronic structure—is required. Specifically, this involves understanding the molecular geometry changes that drive the molecule towards regions of strong coupling among electronic states and the resulting changes in these states.

After a brief introduction to molecular light harvesting, I will present new results we obtained on nucleobases. We use soft x-ray absorption and photoemission spectroscopy to gain insight into changes in the molecular electronic structure after (optical) light excitation. The element- and site-selective nature of this method allows us to gain information about valence charge dynamics with Angstrom precision in space and on a femtosecond timescale. To investigate the light-induced changes in molecular geometry, we use Coulomb-Explosion Imaging, a method that employs an intense and short x-ray pulse to highly ionize the molecules and then resolve the momenta of the exploding molecular fragments. The combination of both methods delivers unprecedented experimental insight into the light-energy conversion dynamics in molecules.

RS-APS Seminar

Towards Microscopic Ghost Imaging in the XUV

Sukyoon Oh
IOQ and Helmholtz Institute Jena

Institutsseminar

Particle Dynamics in Strong Electromagnetic Fields: Simulations and Analytics

Dr. Tom Blackburn
University of Gothenburg

RS-APS Seminar

SXR Microscopy of Wet Samples

Sophia Kaleta
IOQ and Helmholtz Institute Jena

Institutsseminar

Nuclear Radii for Precision Atomic Spectroscopy

Dr. Natalia Oreshkina
Max Planck Institute for Nuclear Physics, Heidelberg

RS-APS Seminar

Sub-picosecond Dynamics during Relativistic Laser–Plasma Interaction

Mohammed Almassarani
IOQ and Helmholtz Institute Jena

Institutsseminar

Structure and Dynamics of Small Quantum Systems Accessed by Nonlinear Interaction With X-rays: FEL Science at the SQS Instrument

Dr. Tommaso Mazza
XFEL, Hamburg

Institutsseminar

Polarized Beams for Plasma Accelerators

Prof. Dr. Markus Büscher
FZ Jülich

RS-APS Seminar

Optimized Generation of Maximally Entangled Photon Pairs

Richard Bernecker
TPI and Helmholtz Institute Jena

Institutsseminar

Innovative Coating Technologies for Fundamental Research and Applications

Dr. Kai Schlage
DESY, Hamburg

HI Jena Semiannual Meeting

Spring Meeting of DPG Section “Kondensierte Materie”

German Mössbauer Workshop 2024

Spring Meeting of DPG Section “Atome, Moleküle, Quantenoptik und Plasmen”

Institutsseminar

Studies of Crystallization in Supercooled Atomic Liquids

Dr. Robert Grisenti
Institut für Kernphysik, Goethe-Universität Frankfurt am Main

Abstract:

Freezing of a liquid is a ubiquitous change of state, but many aspects of this so familiar phase transition are still poorly understood. At the microscopic level, crystallization is classically viewed as a two-steps process. Thermal fluctuations in the supercooled liquid — that is, in the metastable state below its melting point — initially trigger the spontaneous formation of a critical nucleus of the new ordered phase, which subsequently grows to macroscopic dimensions. However, crystallization is by far more complex than represented by this classical description and many details of the process still lack an adequate microscopic understanding. Here, we combine x-ray scattering with microscopic liquid jets of the atomic elements argon and krypton as a powerful approach to the study of crystal nucleation and growth in supercooled liquids, ad- dressing the problems of very short time scale and the inherently stochastic nature of the crys- tallization process [1]. Our results highlight, for example, the importance of thermodynamic as- pects in describing the crystal growth kinetics in binary liquids [2] and provide stringent limits to the validity of classical nucleation theory in atomic liquids, while offering the long-sought per- spective of testing non-classical extensions of the theory [3]. Furthermore, in combination with computer simulations and state-of-the-art ML-based techniques for data analysis, we expect to be able to gain even deeper insights into many aspects of the crystallization process, providing new benchmarks for current theories of crystal nucleation and growth.

[1] Grisenti et al., Adv. Phys. X 3, 1418183 (2018)
[2] Schottelius et al., Nat. Mater. 19, 512 (2020)
[3] Möller et al., Phys. Rev. Lett., in review (2024)

RS-APS Seminar

The Influence of Modal Content of Seed Light on the Transverse Mode Instability Threshold in High-power Fiber Amplifier

Yiming Tu
Fraunhofer IOF and Helmholtz Institute Jena

Annual Meeting of the ErUM-FSP APPA 2024

Institutsseminar

Precision Experiments at the Intersection of Atomic, Nuclear, Plasma and Astro Physics

Prof. Dr. Yury Litvinov
GSI, Darmstadt

RS-APS Seminar

High-Dimensional Quantum Information Processing and Quantum Computing

Baghdasar Baghdasaryan
TPI and Helmholtz Institute Jena

Institutsseminar

Ionization Induced Dynamics in Liquids Uncovered via Ultrafast Time-resolved X-ray Absorption Spectroscopy

Dr. Ludger Inhester
DESY, Hamburg

Abstract:

Our understanding of the immediate response of matter to ionization is crucial for many fields. Experimental developments in ultrafast x-ray spectroscopy and experimental setups with liquid jets provide novel insights into the creation of ions and radicals by ionization and how they further interact with a liquid environment. The species and their evolution are of immediate relevance for corrosion effects, space travel, and medical applications.

To interpret time-resolved ultrafast x-ray spectroscopy experiments, ab-initio modelling of the involved dynamics and the connected evolving spectroscopic features is often imperative. In my talk, I will present our research on tracking fundamental reaction processes via ultrafast x-ray absorption spectroscopy and ab-initio calculations.

My talk will cover the primary steps in radiolysis of water, where our techniques resolves the immediate creation of the OH radical and the hydronium cation [1]. Further insights into the solvation process of electrons in liquid water are presented [2]. Moreover, I will show how our investigations recently uncovered that the primary processes induced by ionization in an aqueous urea solutions is a proton transfer reaction between neighboring urea molecules [3, 4]. I will also give an outlook addressing more recent experiments approaching the attosecond regime revealing the involved dynamics of ionization cascades in liquid water [5].

[1] Loh, Z.-H., Doumy, G., Arnold, C. et al. Science 367 179 (2020)
[2] Sopena, A. M., Li, S. et al. in review
[3] Shakya, Y., Inhester, L. et al. Struct. Dyn. 8, 034102 (2021).
[4] Yin, Z., Chang, Y.-P. et al. Nature 619 749-754 (2023)
[5] Li, S., Lu L. et al. in preparation

HI Jena Semiannual Meeting

RS-APS Seminar

Pointing Jitter Feedback Systems

Maksim Valialshchikov
Helmholtz Institute Jena

Institutsseminar

Towards Laser Excitation of Highly Ionized ²²⁹Th in an Ion Storage Ring

Dr. Carsten Brandau
GSI, Darmstadt

Institutsseminar

Elastic Scattering of Photons: From Low-Energy Resonances to Electron−Positron Pair Production

Prof. Dr. Andrey Surzhykov
PTB and Technical University, Braunschweig

Woche der Teilchenwelt

EMMI Workshop “Towards a Vacuum Birefringence Experiment at the Helmholtz International Beamline for Extreme Fields”

The recent inauguration of the Helmholtz International Beamline for Extreme Fields -- a worldwide unique combination of an XFEL and an intense laser -- at the European XFEL, advances in high-precision x-ray polarimetry, refinements of prospective discovery scenarios and progress in their accurate theoretical modeling have set the stage for performing an actual discovery experiment right now.

The goal of this EMMI Collaboration Meeting is to reach agreement on the most promising experimental setup and to work out a roadmap towards the first detection of this effect in a concerted effort of theory and experiment.

MT Annual Meeting 2023

MML Workshop 2023

RS-APS Seminar

Capture and Non-Destructive Detection of Ion Bunches for High-Intensity Laser Experiments

Markus Kiffer
Institute of Optics and Quantum Electronics, University of Jena

RS-APS Seminar

To Be Announced

Israa Salaheldin
Helmholtz Institute Jena

Institutsseminar

X-ray Wave Mixing: Observing Spontaneous and Stimulated Processes

Dr. Christina Bömer
DESY, Hamburg

Institutsseminar

Ion Track Nanotechnology: From Filter Production to Highly Sensitive Biomimetic Sensors and Energy Materials

Dr. Maria Eugenia Toimil Molares
GSI, Materials Research Department

Institutsseminar

Pushing the Particle Energy Frontier: Plasma Wakefield Acceleration and the AWAKE Experiment at CERN

Dr. Edda Geschwendtner
CERN

Institutsseminar

From Quantum Imaging to Computing – Exploiting the versatile correlations of photonic quantum states

Dr. René Sondenheimer
Fraunhofer IOF

Abstract:

In this talk, I will give a brief overview on different applications of photonic quantum information theory. In particular, we will discuss three main topics. First, I will give an introduction into quantum imaging with undetected photons which is an imaging technique based on correlations of biphoton states that have been generated in nonlinear processes. These correlations allow for obtaining an image of an object with light that never interacted with that object. After highlighting the importance of nontrivial correlations within bipartite quantum systems, I will motivate that the generation of higher harmonics might offer a novel tool to generate such resource states for quantum information processing in the near future. Finally, I will discuss how the correlations between different photonic modes can be exploited to solve computationally hard tasks.

RS-APS Seminar

Signatures of Quantum Vacuum Nonlinearity in Two-Beam Laser Collisions

Chantal Sundqvist
Institute of Theoretical Physics, University of Jena

Institutsseminar

Observation of the radiative decay of the low energy thorium-229 isomer: En route towards a nuclear clock

Dr. Sandro Krämer
KU Leuven

Institutsseminar

Technology developments towards high-resolution, ultra-large microcalorimeter arrays for photon science

Prof. Dr. Sebastian Kempf
Karlsruhe Institute of Technology

Abstract:

In recent years, cryogenic microcalorimeters have impressively proven to advance the state of the art in the detection of ionizing radiation as they combine an excellent energy resolution and fast signal rise time with a quantum efficiency close to 100%. For this reason, microcalorimeter arrays are hot candidates for future instrumentation at next-generation brilliant light sources. However, the resolution of present arrays still lacks behind existing wavelength-dispersive spectrometers. Similarly, the sensitive area is still significantly smaller as compared to semiconductor-based X-ray spectrometers. To overcome these limitations, technology developments are of utmost importance to allow for closely-packed microcalorimeter arrays consisting of thousands of individual detector, each providing sub-eV energy resolution. Within this context, this talk will present our most recent progress related to the development of such outstanding instruments. More precisely, we will discuss several multiplexing strategies as well as novel detector concepts for reaching sub-eV energy resolution.

Spring Meeting of DPG Section “Kondensierte Materie”

Spring Meeting of DPG Section “Atome, Moleküle, Quantenoptik und Plasmen”

Zehnte gemeinsame Lecture Week von RS-APS und HGS-HIRe

HI Jena Semiannual Meeting

Institutsseminar

Strong Field Quantum Electrodynamics Through Precision Spectroscopy of Highly Charged Ions and Exotic Atoms

Nancy Paul
Sorbonne University, Paris

Institutsseminar

Laser Spectroscopy of Antiprotonic Helium Atoms and Pionic Helium Atoms

Masaki Hori
Max Planck Institute for Quantum Optics, Garching

RS-APS Seminar

Time-Frequency Analysis of the SFQED Scattering Processes

Nikita Larin
Institute of Optics and Quantum Electronics, University of Jena

RS-APS Seminar

Continuously Tunable High Photon Flux High Harmonic Source

Alexander Kirsche
Institute of Applied Physics, University of Jena

Institutsseminar

Characterization of the Brain at Sub-Cellular Level Using Synchrotron X-ray Imaging

Dr. Marina Eckermann
European Synchrotron Radiation Facility (ESRF), Grenoble

RS-APS Seminar

Interaction of atoms with vortex light beams in the presence of the oscillating magnetic field

Shreyas Ramakrishna
Institute of Theoretical Physics, University of Jena

Institutsseminar

High Energy Density Science at the European XFEL: Combining Bright X-rays, Tiny Diamonds and Intense Lasers

Ulf Zastrau
XFEL, Hamburg

RS-APS Seminar

Superconducting Tunnel Junctions for Energy-Resolved Radiation Detection in the XUV Range

Nikhilesh Dilwaliya
Leibniz Institute of Photonic Technology

Institutsseminar

Innovative Cancer Therapies Using Charged Particle Irradiation

Claudia Fournier
GSI Helmholtzzentrum für Schwerionenforschung

RS-APS Seminar

Polarization-Flipped Quantum Vacuum Signal in Laser Beam Collisions

Fabian Schütze
Institute of Theoretical Physics, University of Jena

Institutsseminar

Electron-Ion Collisions - Absolute Cross Sections for Astrophysics and Plasma Physics and Spectroscopy of Highly Charged Ions

Stefan Schippers
University of Giessen

Electron-impact ionization and electron-ion recombination are basic atomic processses that govern the charge balance in plasma. Accurate cross sections for the processes are required for being able to model and understand man-made and cosmic plasmas. In my talk I will provide and overview of past and present efforts aiming at providing benchmark cross-sections from electron-ion collision experiments at the Giessen electron-ion crossed-beams setup and at the electron coolers of heavy-ion storage rings. Moreover, the potential of cold electron beams for precision spectroscopy of highly charged ions will be pointed out  and future directions of electron-ion collision work at, in particular, CRYRING will be discussed.

Institute’s Seminar

Towards Frequency Metrology of the Optical Hyperfine Structure of Highly Charged Ions Using Quantum Logic

Peter Micke
BASE Collaboration, CERN, Geneva

Highly charged ions (HCI) are extreme atoms with favorable properties for the study of fundamental physics and the search for new physics [1]. They feature a simple atomic structure due to a small number of bound electrons, strong electromagnetic fields to which the electrons are exposed, and a low sensitivity to external perturbing fields [2]. Recent developments such as Coulomb crystallization [3], the application of quantum logic [4], and algorithmic ground-state cooling [5] have made HCI accessible for use in the most accurate measurement devices: optical atomic clocks, which today reach fractional uncertainties of 10^-18.

In this talk, I will briefly review how we overcame all previous obstacles to realize the first optical atomic clock based on an HCI. I will present our frequency ratio measurement of the ground-state fine-structure transition in Ar¹³⁺ at 441 nm against the electric-octupole transition in ¹⁷¹Yb⁺ at a fractional uncertainty of about 1x10^-16, limited by statistics and improving the previous uncertainty level by eight orders of magnitude [6]. By comparing the transition frequencies of the two isotopes ⁴⁰Ar¹³⁺ and ³⁶Ar¹³⁺, we determined the isotope shift with a relative uncertainty of 5.7x10^-11, an improvement of nine orders of magnitude that resolves the QED nuclear recoil contribution [6]. In the second part of my talk, I will discuss how the measurement concept can be extended to optical hyperfine-structure transitions which are available in heavy hydrogen-like or lithium-like HCI.

1. M. S. Safronova et al., Rev. Mod. Phys. 90, 025008 (2018)
2. M. G. Kozlov et al., Rev. Mod. Phys. 90, 045005 (2018)
3. L. Schmöger et al., Science 347, 1233–1236 (2015)
4. P. Micke et al., Nature 578, 60–65 (2020)
5. S. A. King et al., Phys. Rev. X 11, 041049 (2021)
6. S. A. King et al., Nature (in print)

26th Conference on the Application of Accelerators in Research and Industry (CAARI)

Institute’s Seminar

Imaging Techniques in Mössbauer Spectroscopy: Carrier Trapping on Iron Impurities in Si Solar Cells and Carbon Diffusion in Fe Steel

Yutaka Yoshida
Helmholtz Institute Jena

Institute’s Seminar

Collinear Laser Spectroscopy of Highly Charged Ions for Nuclear Structure and Fundamental Research

Wilfried Nörtershäuser
TU Darmstadt

Collinear laser spectroscopy has been applied on beams of highly charged ions from the keV to the GeV range. Helium-like systems of light isotopes are studied at the Collinear Apparatus for Laser Spectroscopy and Applied Sience (COALA) at TU Darmstadt to extract nuclear charge radii and nuclear moments of stable isotopes. This approach is based on nonrelativistic QED calculations with the highest currently achievable accuracy. At the Experimental Storag Ring (ESR) at GSI Darmstadt, heavy highly charged ions were studied to test QED in the strongest magnetic fields available in the laboratory. Here, laser spectrosocpy is performed on hydrogen-like Bi⁸²⁺ and lithium-like Bi⁸⁰⁺ ions at about 70% of the speed of light. I will present the status of these experiments and provide an outlook for further studies on short-lived species and at higher accuracy. 

Annual Meeting of the Helmholtz Programm “Matter and Technologies”

Trapped Charged Particles Conference 2022 (TCP2022)

28th International Nuclear Physics Conference (INPC2022)

German Conference for Research with Synchrotron Radiation, Neutrons and Ion Beams at Large Facilities (SNI2022)

19th SPARC Topical Workshop

0

20th International Conference on the Physics of Highly Charged Ions (HCI)

RS-APS Seminar

Ponderomotive Scattering as a Means of Intensity Measurement in Focus

Tom Teter
HI Jena

EMMI Workshop on “HITRAP Facility and Experiments – Status and Future Perspectives”

Institute´s Seminar

Impact of the Laser Spatio-Temporal Shape on Breit-Wheeler Pair Production

Anthony Mercuri-Baron
Sorbonne Univ., Paris

Institute´s Seminar

New Horizons for Ultrafast Pulse Compression

Marcus Seidel
DESY

RS-APS Seminar

0

14th European Conference on Atoms, Molecules and Photons (ECAMP)

RS-APS Seminar

Multispectral Imaging in the Extreme Ultraviolet by Spectral Tuning of High Order Harmonics

Sici Wang
HI Jena/IAP

14th International Symposium of EBIS/T

11th International Conference on Precision Physics of Simple Atomic Systems (PSAS)

RS-APS Seminar

Relativistic Electron-Cyclotron Resonances in Laser Wakefield Acceleration

Matthew Schwab
IOQ

Institute´s Seminar

Optical Advances in Hard X-Ray Spectroscopy

Hasan Yavas
SLAC

Plasma Physics Seminar

Spring Meeting of DPG Section “Atome, Moleküle, Quantenoptik und Plasmen”

Semiannual Meeting of the HI Jena

IOQ Seminar

IOQ Seminar

RS-APS Seminar

IOQ Seminar

RS-APS Seminar

IOQ Seminar

AP Seminar

IOQ Seminar

RS-APS Seminar

0

IOQ Seminar

IOQ Seminar

IOQ Seminar

RS-APS Seminar

IOQ Seminar

MML Workshop 2021

0

IOQ Seminar

IOQ Seminar

RS-APS Seminar

IOQ Seminar

RS-APS Seminar

9th Joint Lecture Week of RS-APS and HGS-HIRe

This lecture week will be organized by RS-APS in cooperation with HGS-HIRe. Owing to the ongoing pandemic situation, this event will be an online-only videoconference, realized through the Zoom service.

Topic: Novel Applications of Modern Laser Technologies

Semiannual Meeting of the HI Jena

Meeting of DPG Section “Atome, Moleküle, Quantenoptik und Plasmen”

ExHILP 2021

18th SPARC Topical Workshop

0

Doctoral students conference on optics DoKDoK 2021

Meeting of DPG Section “Materie und Kosmos”

XXXII International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC)

0

IOQ Seminar

RS-APS Seminar

IOQ Seminar

RS-APS Seminar

0

52nd Conference of the European Group on Atomic Systems (EGAS)

AP Seminar

0

IOQ Seminar

RS-APS Seminar

IOQ Seminar

IOQ Seminar

Annual Meeting of the Helmholtz Programm "Matter and Technologies"

0

RS-APS Seminar

IOQ Colloquium

IOQ Seminar

IOQ Seminar

RS-APS Seminar

IOQ Seminar

IOQ Seminar

IOQ Seminar

IOQ Seminar

RS-APS Seminar

IOQ Seminar

IOQ Seminar

RS-APS Seminar

Thüringer Forschungspreis 2021

0

Semiannual Meeting of the HI Jena

RS-APS Seminar

IOQ Seminar

Annual Meeting of the Helmholtz Programm "Matter and Technologies"

The seventh annual meeting of the programme Matter and Technologies will take place from Tuesday, February 2, 2021 to Wednesday, February 3, 2021.

The day before the workshop, Monday, February 1, 2021, students connected to the programme will organize the Seventh MT student retreat, starting around noon on Monday.

IOQ Seminar

RS-APS Seminar

AP Seminar

IOQ Seminar

Annual Meeting of the ErUM-FSP APPA 2021

SPARC User and Collaboration Workshop: Stored and Cooled Heavy Ions at FAIR Phase-0 2021

RS-APS Seminar

0

Institute´s Seminar

0

RS-APS Seminar

0

RS-APS Seminar

0

Semiannual Meeting of the HI Jena

Eigth Joint Lecture Week of RS-APS and HGS-HIRe

This lecture week will be organized by RS-APS in cooperation with HGS-HIRe. Owing to the current situation, this event will be an online-only videoconference, realized through the Zoom service.

Topic: The Prospects of Cryogenic Detectors and Superconducting Electronics: From Fundamental Research to Applications

German Mössbauer Workshop 2020

0

17th SPARC Topical Workshop

0

Joint International Symposium on Microbial and Biomolecular Interactions

Student Workshop in cooperation with NaWi School e.V.

Institute´s Seminar

0

Institute´s Seminar

0

Institute´s Seminar

0

Semiannual Meeting of the HI Jena

Institute´s Seminar

0

APPA R&D Collaboration Meeting 2020

Institute´s Seminar

0

Institute´s Seminar

0

Seventh Joint Lecture Week of RS-APS and HGS-HIRe

This lecture week will be organized by RS-APS in cooperation with HGS-HIRe.

Topic: Imaging Techniques from the Optical to the X-Ray Regime

HGS-HIRe SUMMER STUDENT PROGRAM at GSI / FAIR

Institute´s Seminar

0

EMMI Workshop on "Functional Methods in Strongly Correlated Systems"

COST-THOR Spring School on Science Communication

0

Annual Meeting of the Helmholtz Programm "Matter and Technologies"

The fifth annual meeting of the programme Matter and Technologies will take place at Helmholtz Institute Jena from Tuesday, March 5, 2019 to Thursday, March 7, 2019.

The day before the workshop, Monday, March 4, 2019, there will be the opportunity for topical meetings. In addition the students connected to the programme will organize the Fifth MT student retreat, starting around noon on Monday.

Semiannual Meeting of the HI Jena

RS-APS Seminar

We talk about one-dimensional quantum walk driven by entangled coins. We will demonstrate that the entanglement, introduced by the coins, enables one to steer the walker's state from a classical to standard quantum-walk behavior, and to novel behavior not found for one-dimensional walks otherwise. We also show that states with a symmetric density distribution and a maximum or minimum of the entropy are found only for maximally entangled initial states (Bell states). On the other hand, the type of probability density distribution and its variance are only determined by entangled coins. In addition, we explain how the entanglement of initial state determines the most probable place to find the walker.

Institute´s Seminar

0

RS-APS Seminar

0

Institute´s Seminar

0

Sixth Joint Lecture Week of RS-APS and HGS-HIRe

This lecture week will be organized by RS-APS in cooperation with HGS-HIRe.

Topic: Interface between Atomic- and Nuclear Physics

Institute´s Seminar

0

EMMI Rapid Reaction Task Force Workshop

0

Doctoral students conference on optics DoKDoK 2018

Take part in the 7th DoKDoK! The conference provides a great opportunity for young researchers, academicians and industry players working in Optics and Photonics to present their newest findings, share experience, and network in a friendly and collegial atmosphere. The conference is held entirely in English and has an international focus.

PhD students are cordially invited to submit their original contributions. The technical program will include invited talks from academicians and industry representatives.

Abstract submission deadline: 30th June 2018

15th SPARC Topical Workshop

0

19th international Conference on Physics of Highly Charge Ions (HCI 2018)

Institute´s Seminar

0

26th International Conference on Atomic Physics, ICAP

0

RS-APS Seminar

0

Institute´s Seminar

0

50th Anniversary European Group on Atomic Systems (EGAS)

0

RS-APS Seminar

0

RS-APS Seminar

0

Institute´s Seminar

0

Institute´s Seminar

0

RS-APS Seminar

0

PSAS´2018 – the International Conference on Precision Physics of Simple Atomic Systems

Semiannual Meeting of the HI Jena

RS-APS Seminar

0

SCS Instrument Early User Workshop

SQS Instrument Early User Workshop

Institute´s Seminar

0

APPA R&D collaboration meeting

Institute´s Seminar

0

RS-APS Seminar

0

Seminar

0

Institute´s Seminar

0

Institute´s Seminar

0

RS-APS Seminar

0

Institute´s Seminar

0

RS-APS Seminar

This thesis describes the development of a particle counter based on a Cerium activated yttrium aluminium perovskite (YAP:Ce) scintillator. The detector is designed for charge exchange experiments at the relocated ion storage ring CRYRING at the GSI Helmholtz Zentrum für Schwerionenforschung in Darmstadt. It will be used for charge exchange experiments. The suggested detector design was developed regarding the requirements set by the desired ultra high vacuum conditions of up to 10⁻¹² mbar at CRYRING in combination with a high radiation hardness against ion irradiation. The design was kept as simple as possible offering an easy exchange of the scintillator (not limited to YAP:Ce) if necessary.

For an estimation of the detector lifetime the radiation hardness was systematically investigated for Hydrogen, Oxygen and Iodine irradiation in the energy regime of 1 – 10 MeV. The measurement took place at the JULIA tandem accelerator. For the measurement of detector degradation the light yield was used. Values determined for the critical fluence, defined as fluence at half the initial light yield, varied from 1 × 10¹⁵ cm⁻² in the case of hydrogen down to 1.7 × 10¹² cm⁻² for iodine irradiation.

Prior to the hardness investigation, the used photomultiplier tube (PMT) was tested for anomalous behaviour like temporal or spatial dependence of the output signal. Taking the experimental uncertainties into account no such dependencies could be observed. It was concluded that the investigated PMT was well suited for the use in the experiment and later on the particle counter.

Institute´s Seminar

0

RS-APS Seminar

0

Institute´s Seminar

The Institut Laue-Langevin operates a number of instruments for neutron capture based gamma ray spectroscopy. Amongst them there are the ultra-high resolution crystal spectrometers GAMS, which operate at a tangential beam tube of ILL’s neutron high flux reactor. From targets in this beam tube gamma rays in an energy range from 50–8000 keV and intensities of 10⁹ s^-1 cm^-2 eV^-1 can be obtained. Based on these extra-ordinary intensities it was possible to develop unique techniques based on gamma ray monochromatisation via diffraction at perfect crystals. The talk gives an overview on a number of experiments in nuclear, fundamental and applied physics profiting from the outstanding performances of the GAMS spectrometers. A particular focus will be made on the recent research of gamma ray optics and an experiment for nuclear resonance fluorescence based radiography of lithium. The future perspectives of these techniques at tunable gamma ray sources such as ELI-NP will be detailed.

Doctoral students conference on optics DoKDoK 2017

0

Fifth Joint Lecture Week of RS-APS and HGS-HIRe

0

SPARC Topical Workshop 2017

0

19th International Conference on “Physics of Highly Charged Ions” HCI

0

5th International FAIR School

24th Euroschool on Exotic Beams

0

Institute´s Seminar

0

International EMMI Workshop on Plasma Physics at FAIR

The Plasma Physics program at FAIR, one essential part of the FAIR project, will exploit a dedicated beamline and target area with unprecedented ion intensities. This offers worldwide unique capabilities to the plasma physics community.  Already during the construction phase it will be possible to run an attractive experimental program at the SIS-18 target area or using the PHELIX laser. The three-day workshop will give an opportunity to discuss upcoming experiments and continue developing the science program of the plasma physics community at FAIR.

Workshop topics include:

• Physics of high energy density states: theory, experiments, diagnostics
• EOS of matter under extreme conditions
• Energy transport in warm dense matter
• Atomic processes in strongly coupled plasmas
• Laser based photon and particle sources for HED/WDM-diagnostics
• Materials research, atomic physics, and biophysics related to plasma physics
• Experiments with ion beams in 2018–2019 from SIS 18
• Combined laser and ion beam experiments

Institute´s Seminar

0

RS-APS Seminar

0

OMA School on Medical Accelerators

0

Institute´s Seminar

0

RS-APS Seminar

0

Institute´s Seminar

0

Open House at FAIR and GSI

Accelerators and experiments at the existing GSI facility open their doors to the public. The future FAIR facility presents their plans for civil construction and the experimental program. Dive into a world of science and explore “the universe in the laboratory.”

Semiannual Meeting of the HI Jena

0

RS-APS Seminar

0

APPA R&D Kick-Off Meeting

0

RS-APS Seminar

0

RS-APS Seminar

0

Institute´s Seminar

0

RS-APS Seminar

0

Institute´s Seminar

0

Institute´s Seminar

0

RS-APS Seminar

0

Atomic Physics with (super) Heavy Atoms and Ions

0

Institute´s Seminar

0

Fourth Joint Lecture Week of RS-APS and HGS-HIRe

This lecture week will be organized by RS-APS in cooperation with HGS-HIRe.

Topic: Innovative detectors for photons and particles

Doctoral students conference on optics DoKDoK 2016

0

Institute´s Seminar

0

SPARC Topical Workshop 2016

The 13^th SPARC Topical Workshop will take place between 16^th and 20^th September 2016 at Marian Smoluchowski Institute of Physics of the Jagiellonian University in Kraków, Poland.

Topics include

• Atomic Collisions with Highly Charged Ions
• Critical and Super-critical Fields
• Laser and X-ray Spectroscopy
• Cross-link between Atomic and Nuclear Physics
• CRYRING: Status and Instrumentation
• HESR: Status and Instrumentation
• HITRAP: Status and Instrumentation
• APPA cave: Experiments and Instrumentation
• SPARC Relevant International Facilities
• Status SPARC Collaboration

18th International Conference on the Physics of Highly Charged Ions (HCI-2016)

The 18th International Conference on the Physics of Highly Charged Ions will be held from 11 to 16 September 2016 in Kielce, Poland. The HCI-2016 follows a series of biennial HCI conferences, with last three meetings held in San Carlos de Bariloche (Argentina, 2014), Heidelberg (Germany, 2012) and Shanghai (China, 2010). The HCI-2016 will be organized by the Institute of Physics of the Jan Kochanowski University (UJK) in Kielce, which is located in Central Poland in the heart of the Holy Cross Mountains, just between Warsaw (Warszawa) and Cracow (Krakow), the present and former Polish capitals.

International Student Summer Programme on X-Ray and Neutron Science

17th Advanced Accelerator Concepts Workshop (AAC 2016)

The 17th Advanced Accelerator Concepts Workshop (AAC 2016) will be held at the Gaylord National Resort & Convention Center from July 31st to August 5th, 2016.

AAC 2016 is a by-invitation-only biennial forum for intensive discussions on long-term research in advanced accelerator physics and technology, for applications ranging from high energy physics to photon science. AAC 2016 will organize into working groups covering the following topical areas:

• Laser-Plasma Wakefield Acceleration
• Computations for Accelerator Physics
• Laser and High-Gradient Structure-Based Acceleration
• Beam-Driven Acceleration
• Beam Sources, Monitoring, and Control
• Laser-Plasma Acceleration of Ions
• Radiation Generation and Advanced Concepts
• Advanced Laser and Beam Technology and Facilities

HGS-HIRe Summer Student Program at GSI/FAIR

Institute´s Seminar

0

Semiannual Meeting of the HI Jena

0

43rd European Physical Society Conference on Plasma Physics

The 43rd European Physical Society Conference on Plasma Physics will take place in Leuven, Belgium, from 4 to 8 July 2016. This series of EPS plasma physics conferences is organized by the EPS Plasma Physics Division and covers the wide field of plasma physics, ranging from nuclear fusion research to low temperature plasmas, including space and astrophysical plasmas as well.

RS-APS Seminar

0

Institute´s Seminar

The interaction of matter with high-intensity lasers is traditionally described by modelling the laser as a plane wave background field. This description becomes invalid (i) at ultra-high intensities requiring strong focussing and (ii) whenever there is substantial back-reaction on the external field yielding e.g. beam depletion. I will describe a number of theoretical attempts aimed at improving the current methodology to deal with these rather extreme, but soon experimentally feasible, conditions.

Physik in Hollywood

0

Institute´s Seminar

0

RS-APS Seminar

0

Institute´s Seminar

0

RS-APS Seminar

0

PSAS´2016: International Conference on Precision Physics of Simple Atomic Systems

The conference is devoted to precision studies of simple atoms and molecules in order to develop new approaches and to access various fundamental issues within and beyond atomic physics, and possible new physics. Applications include aspects from particle and nuclear physics, atomic and molecular physics, astrophysics, metrology, etc.

Conference topics include :

• Precision spectroscopy of hydrogen, its isotopes and other light atoms
• Precision frequency measurements and determination of fundamental constants
• Quantum electrodynamics and advanced quantum mechanics
• Study of pure leptonic systems, muonic and exotic atoms
• Study of few-electron ions with medium and high Z
• Search for variation of fundamental constants and tests of fundamental symmetries
• Casimir Effect and its applications
• Structure of light nuclei and other hadronic effects
• Fundamental constants of particle physics
• Quantum Information
• (Astrophysics and Cosmology)
• (New SI system)

RS-APS Seminar

0

Institute´s Seminar

0

RS-APS Seminar

0

Institute´s Seminar

0

607. Wilhelm und Else Heraeus-Seminar on “Semiconductor detectors in astronomy, medicine, particle physics and photon science”

The 607. Wilhelm und Else Heraeus-Seminar on “Semiconductor detectors in astronomy, medicine, particle physics and photon science” brings together young and senior scientists, scientists from academia and industry and researchers from university and laboratories with interests in the field of semiconductors.

The goals of the seminar are

• to get informed on the state-of-the-art in the field of semiconductor detectors
• to bring together leading scientists, detector builders and detector users in astronomy, astrophysics, medicine, particle physics and photon science
• to review and to identify new trends and challenges
• to promote young scientists

The program consists of invited talks with ample time for discussion and a podium discussion. We encourage everyone, in particular young scientists, to contribute a poster to the poster session.
The three best posters will be awarded a prize. The Wilhelm und Else Heraeus-Foundation kindly supports the accommodation of all participants and will cover full board accommodation during the seminar (beverages not included).

RS-APS Seminar

0

Institute´s Seminar

0

Institute´s Seminar

0

RS-APS Seminar

0

Institute´s Seminar

0

RS-APS Seminar

0

RS-APS Seminar

0

RS-APS Seminar

0

Work & Laser Safety Instructions 2015

0

Institute´s Seminar

Laser plasma accelerators (LPAs) hold great promise as ultra-compact electron sources because of their high acceleration gradients (~GeV/cm) and flexible format, but have yet to gain wide-spread acceptance due to limitations in their tunability and stability. These limitations, caused by the fluid nature of the accelerator formation, have required the development of sophisticated new techniques tailored to manage the microscopic dynamics of the laser-plasma interaction. This talk will highlight recent work aimed at addressing the unique control challenges of this accelerator format, including the use of multiple-pulse collisions to trigger electron injection, the use of tomography to see through walls, the use of spectroscopic imaging to track gas-plume and laser evolution and the use of chirped-pulse interferometry to resolve wake-induced Raman shifts. These methods provide a tremendous wealth of in-situ, shot-by-shot information from within the accelerator, enabling control of and shining new light on what has previously been a black box accessible primarily by simulation.

Semiannual Palaver Helmholtz Institute Jena

Institutsseminar des IFK

0

Institute´s Seminar

0

Seminar

0

RS-APS Seminar

0

Institute´s Seminar

0

International Conference on Accelerator Optimization

12th Topical Workshop of the SPARC Collaboration

Please note that hotel conditions at the conference site make an early registration deadline of August 10^th necessary.

Third Joint Lecture Week of RS-APS and HGS-HIRe

This lecture week will be organized by RS-APS in cooperation with HGS-HIRe.

Topic: (Laser) Spectroscopy of Stored and Trapped Ions

4th International FAIR School

The 4th International FAIR School, will take place in September in Castiglione della Pescaia in Italy. It is designed for young students with research interests in FAIR physics and is a good start to get an overview on what's happening at FAIR.

Local costs are covered, there is limited support for travel as well. The selection of students will be made early June, the deadline for application is May 31.

Seminar

0

HIC4FAIR Workshop Detectors and Accelerators

XXIX International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC)

0

35. Summer student program at GSI/FAIR 2015

For the summer student program 2015 we shall welcome 37 students from 17 countries in Europe and East Asia. During the eight weeks of the program each student is going to work on a small scientific project supervised by a tutor. In addition a lecture series will be held that presents the various research fields and applications at GSI. The program will be complemented by introductory soft skill courses.

24th International Symposium on Ion Atom Collisions (ISIAC 2015)

Institute´s Seminar

0

Semiannual Meeting of the HI Jena

0

Institute´s Seminar

0

European Summer School 2015: LIGHT! An introduction to modern Physics of Light

39th International conference on Vacuum Ultraviolet and X-ray Physics, VUVX2016

Institute´s Seminar

0

RS-APS Seminar

0

Seminar

0

Institute´s Seminar

0

RS-APS Seminar

We present a demonstration of the plasma lensing effect measured with an all-optical two-stage setup at the JETI laser system in Jena, Germany: In the first stage electrons are accelerated via laser wake field acceleration. This electron bunch was then focused by a second stage without any external fields applied. To our knowledge, this is the first experiment showing plasma lensing with LWFA accelerated electrons and a passive focusing stage, i.e. where the bunch self-focuses inside the focusing plasma stage.

Institute´s Seminar

0

RS-APS Seminar

0

Institute´s Seminar

In collisions of relativistic nuclei of gold (the RHIC collider) or lead (the LHC collider) electric and magnetic fields may exceed by several orders of magnitude the critical Schwinger field, but these fields act during a very short time. In this report I present a small review of our papers related to electromagnetic processes at the RHIC and LHC colliders. It includes such topics as: Strong-field effects in the lepton pair production; Large contribution of the virtual Delbrueck scattering into nuclear bremsstrahlung; Production of bound-free e⁺e^- pairs.

9th International Symposium on Swift Heavy Ions in Matter

RS-APS Seminar

0

Institute´s Seminar

0