Newsletter November 2014
Dear colleagues and friends of the HI Jena,
welcome to the latest issue of the HI Jena newsletter. We use this opportunity to report about recent activities at the HI Jena, and to inform you about upcoming conferences and seminars.
Helmholtz Institute Jena
Research news and developments
Observation of Gigawatt Class THz Pulses from a Compact Laser-Driven Particle Accelerator
High-power laser generated plasmas are known to be compact sources of high frequency electromagnetic radiation. In addition to being useful secondary radiation source, analysis of these radiation can also reveal the inner dynamics of these complex plasmas. Because most of the studies on the plasma-generated radiation have concentrated on the visible, EUV and X-ray bands, little is known about laser-plasmas as low frequency radiation emitters. In our latest research, we have recorded extremely high-power terahertz radiation (T rays) from relativistic laser-solid interaction . T ray pulses with a minimum 700 μJ energy and sub-picosecond duration (that is, GW peak power levels) were generated by the transient sheath field which is responsible for the acceleration of protons and ions to MeV energies in laser-plasma experiments. The energy of this T-ray pulses are only rivaled by the light-sources based on conventional accelerators . Our latest work, characterized the generated T rays in space and time and investigated the relation between the ion acceleration process and the T ray emission. We have found that the power of the emitted radiation is proportional to the square of the particle number and their magnitude of acceleration. Our estimates suggest that about 1% of the energy is converted from ions to T rays.
The experiments were performed at the JETI laser system at IOQ. Special geometry collection optics and non-collinear single-shot pump-probe diagnostics ensured the optimum collection of the T-rays and their detection respectively. Two dimensional PIC simulations carried out by the group of Dr. Paul Gibbon at the Jülich Super Computing Centre evidenced the generation of transient current at the target rear surface which could lead the generation of T rays. Spatial and temporal analysis of the Poynting vector shows also the emission of non-collinear low frequency radiation.
Our work has shown that high-power laser-solid interaction is a promising scalable source of highpower T rays. Optimal focusing of this radiation could generate electric fields of the order of 109 V/m and associated magnetic fields of the order of few Tesla, thus opening the way for many exciting studies in nonlinear optics and material science. Moreover, the simultaneous generation of the highpower T rays and accelerated ion beam may be exploited to re-accelerate the ions to even higher energies by driving a miniaturized RF-cavity with T rays.
News and Announcements
ICAMDATA Conference was held at Helmholtz Institute Jena
The 9th International Conference on Atomic and Molecular Data and Their Applications (ICAMDATA 2014) took place on 21-15 September 2014 in Jena. The ICAMDATA 2014 was organized jointly by the Helmholtz Institute Jena and Friedrich Schiller University Jena. It was continuing the series of international conferences whose aim is to promote the use of atomic and molecular data in various fields of science and technology, and to provide a forum for the interaction of data producers, database designers and compilers, and data users. Almost 100 participants from more than 20 countries came to Jena in order to discuss a number of challenging topics, such as:
- Application and needs of atomic and molecular data
- Atomic and molecular data collections, assessment and dissemination
- Experimental and theoretical atomic and molecular data generation
Seminar room HI-Jena, Fröbelstieg 3
This tutorial-talk presents an introduction to the interaction of light and matter on the attosecond timescale. My aim is to overview the theoretical description of ultra-short time-delays, and to relate these to the phase of extreme ultraviolet (XUV) light pulses and to the asymptotic phase-shifts of photoelectron wave packets. Special emphasis is laid on time-delay experiments, where attosecond XUV pulses are used to photoionize target atoms at well-defined times, followed by a probing process in real time by a phase-locked, infrared laser field. In this way, the laser field serves as a "clock" to monitor the ionization event, but the observable delays do not correspond directly to the delay associated with single-photon ionization. Instead, a significant part of the observed delay originates from a measurement induced process, which obscures the single-photon ionization dynamics. This phase-lag effect is traced back to a phase-shift of the above-threshold ionization transition matrix element, which we call the continuum--continuum phase.
It arises due to the laser-stimulated transitions between Coulomb continuum states. As we shall show here, these measurement-induced effects can be separated from the single-photon ionization process, using analytical expressions of universal character, so that eventually the attosecond time-delays in photoionization can be accessed. Finally, I will show results of atomic delay calculations performed using diagrammatic many-body perturbation theory.
Kickoff meeting Matter and Technologies
Registration for the kickoff meeting Matter and Technologies is now open under
where you will also find more details about the meeting, about accomodations etc.
The program is slowly taking shape. It will consist of a plenary part, where the accelerator and the detector topic are together and discuss highlights and plans, and parallel sessions, where details of the ARD and the DTS topic will be discussed.
XXIX International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC)
The ICPEAC conference is held biennially since 1958 in order to promote the growth and exchange of information in the fields of collisions involving photons, electrons, ions, atoms, molecules, clusters, surfaces, and exotic particles. Recent expansions of the conference scope include collision with cold targets and attosecond science.
The scientific programme will consist of invited Plenary Lectures and Progress Reports. In addition, a number of oral Special Reports will be selected from the contributed abstracts. Plenary talks are of general interest to all participants. Progress Reports and Special Reports will be arranged in two parallel sessions, and describe recent work in different subfields. In particular, the Special Reports are short presentations on the most recent advances. Posters will be presented in afternoon sessions.
The XXIX ICPEAC will be hosted by the Universidad Autónoma de Madrid and the Consejo Superior de Investigaciones Científicas. The
convention venue will be the Toledo Congress Centre, just 70 km from Madrid (Spain). It is located in the historical centre of the city of Toledo, declared a World Heritage Site by UNESCO in 1986 for its extensive cultural and monumental heritage and historical co-existence of Christian, Muslim and Jewish cultures.
More information and registration: http://icpeac2015.com
A pulsed supersonic gas jet target for precision spectroscopy at the HITRAP facility at GSI
D. Tiedemann, K. E. Stiebing, D. F. A. Winters, W. Quint, V. Varentsov, A. Warczak, A. Malarz, and Th. Stöhlker
Nucl. Instr. Meth. Phys. Res. A 764, 387 (2014)
Determination of small level splittings in highly charged ions via angle-resolved measurements of characteristic x rays
Z. W. Wu, N. M. Kabachnik, A. Surzhykov, C. Z. Dong, and S. Fritzsche
Phys. Rev. A 90, 052515 (2014)
Electron-loss-to-continuum cusp in U⁸⁸⁺ + N₂ collisions
P.-M. Hillenbrand, S. Hagmann, A. B. Voitkiv, B. Najjari, D. Banaś, K.-H. Blumenhagen, C. Brandau, W. Chen, E. De Filippo, A. Gumberidze, D. L. Guo, C. Kozhuharov, M. Lestinsky, Yu. A. Litvinov, A. Müller, H. Rothard, S. Schippers, M. S. Schöffler, U. Spillmann, S. Trotsenko, X. L. Zhu, and Th. Stöhlker
Phys. Rev. A 90, 042713 (2014)
Relativistic calculations of x-ray emission following a Xe-Bi 83+ collision
Y. S. Kozhedub, V. M. Shabaev, I. I. Tupitsyn, A. Gumberidze, S. Hagmann, G. Plunien, and Th. Stöhlker
Phys. Rev. A 90, 042709 (2014)
Off-axis low-energy structures in above-threshold ionization
M. Möller, F. Meyer, A. M. Sayler, G. G. Paulus, M. F. Kling, B. E. Schmidt, W. Becker, and D. B. Milošević
Phys. Rev. A 90, 023412 (2014)
High precision measurement of undulator polarization in the regime of hard x-rays
B. Marx, K. S. Schulze, I. Uschmann, T. Kämpfer, O. Wehrhan, H. C. Wille, K. Schlage, R. Röhlsberger, E. Weckert, E. Förster, Th. Stöhlker, and G. G. Paulus
Appl. Phys. Lett. 105, 024103 (2014)
Collimated proton acceleration in light sail regime with a tailored pinhole target
H. Y. Wang, X. Q. Yan, and M. Zepf
Phys. Plasmas 21, 063113 (2014)
Design of a compact spectrometer for high-flux MeV gamma-ray beams
D. J. Corvan, G. Sarri, and M. Zepf
Rev. Sci. Instrum. 85, 6 (2014)
Development of a Joule-class Yb:YAG amplifier and its implementation in a CPA system generating 1 TW pulses
C. Wandt, S. Klingebiel, S. Keppler, M. Hornung, M. Loeser, M. Siebold, C. Skrobol, A. Kessel, S. Trushin, Z. Major, J. Hein, M. C. Kaluza, F. Krausz, and S. Karsch
Laser Photon. Rev. 8, 875 (2014)
Strong-field control of the dissociative ionization of N 2 O with near-single-cycle pulses
M. Kübel, A. S. Alnaser, B. Bergues, T. Pischke, J. Schmidt, Y. Deng, C. Jendrzejewski, J. Ullrich, G. G. Paulus, A. M. Azzeer, U. Kleineberg, R. Moshammer, and M. F. Kling
New J. Phys. 16, 065017 (2014)
Vortex algebra by multiply cascaded four-wave mixing of femtosecond optical beams
P. Hansinger, G. Maleshkov, I. L. Garanovich, D. V. Skryabin, D. N. Neshev, A. Dreischuh, and G. G. Paulus
Opt. Express 22, 11079 (2014)