Events during the next 4 weeks

• 10:00 am -- IT/EE-Palaver
  Seminarraum Theorie, Südbau, III. Stock GSI

  Herr Kayser, Herr Klaproth, Fa. SmartOptics:

  "WDM Grundlagen"

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• 2:30 pm -- Physik dichter Plasmen mit Schwerionen- und Laserstrahlen
  Seminarraum Theorie, Südbau, III. Stock GSI

  Mathias Winkel, Jülich Supercomputer Centre, Institute for Advanced Simulation, Forschungszentrum Jülich:

  "Electronic Correlations in Nanoclusters: Tree Code Simulations"

  Recent developments in short pulse laser technology combined with advances in the preparation of metallic nanoclusters have led to new possibilities in the exploration of the electronic properties of nano-scale materials. Since the quasi free electrons inside the cluster are confined to a very small volume, their collective properties significantly change in comparison to bulk matter. Extending earlier simulations of Raitza et al., we examine optical properties of laser-excited nano¬clusters. In particular, we study electronic correlations in a sodium-like material. To cover a broad range from nano- to microscale, the momentum autocorrelation function is evaluated in classical molecular dynamics simulations for systems with several hundred up to few million electrons. Computations at this scale are made possible through the use of the highly scalable parallel Barnes-Hut tree code PEPC developed at JSC. It was recently extended to exploit hybrid supercomputer architectures such as the BlueGene/Q. First results for electronic resonances in metallic nanoclusters are shown and compared to the respective bulk properties.
  
  

• 4:15 pm -- GSI-Festkolloquium

  aus Anlass des 85. Geburtstags von Prof. Rudolf Bock
  Hörsaal GSI

  Reinhard Stock, University of Frankfurt:

  "50 Years in Life and Science with Rudolf Bock"

  In honor of Rudolf Bock, at the occasion of his 85th birthday, I will recall some outstanding stations of his life in science. This ranges from the foundation of GSI and, at about the same time, the first crucial steps in extending heavy ion physics to relativistic energy, in the early 70ties. He founded the GSI-LBL Collaboration at the Berkeley Bevalac, which shaped all subsequent research in strongly interacting matter at high energy density until today due to the construction of large acceptance "4Pi" detector systems: an approach governing the future key experiments, from the CERN SPS NA49 and WA89 experiments via STAR at RHIC, to ALICE at the LHC. From initial insight concerning the hadronic matter equation of state at the Bevalac and at the SIS synchrotron of GSI, Rudolf Bock has moved onward with the field developing into the analysis of the "Quark Matter"-state of QCD, notably by securing a crucial role of GSI in constructing the CERN-SPS-program with ultrarelativistic Lead(Pb208) beams. This work has found a continuation to the present ALICE experiment at the CERN LHC, with GSI again contributing the heart of this detector. From the early Bevalac times, a second, completely novel research theme arose with the idea to induce thermonuclear pellet fusion by inertial confinement under bombardment with heavy relativistic nuclear beams of unprecedented luminosity. Rudolf Bock has rooted this research at GSI, and he still serves this program as a "spiritus mentor", until today! Congratulations, Rudolf!
  
  

• 5:00 pm -- Physikalisches Kolloquium
  Hörsaal des Instituts für Kernphysik, Becherweg 45 Mainz

  Prof. Dr. Makoto C. Fujiwara, Triumf, Canada:

  "Casting Light on Antimatter: Fundamental Physics with Trapped Antihydrogen Atoms"

  
  

• 11:00 am -- NuSTAR Seminar
  Seminarraum Theorie, Südbau, III. Stock GSI

  Haik Simon, GSI:

  "Stepping stones across the dripline"

  In my presentation I'd like to focus on the very exotic 13Li nucleus, its subsystems, and the associated stepping stone 14Be being studied by particular breakup reactions. I'd like to present selected examples to illustrate the validity and range of the used methods and will put a focus on the reaction mechanism, allowing to tailor the properties of the populated unbound extremely neutron rich systems. Ambiguities in the interpretation of different data sets will be presented and discussed. I'd like to show future prospects for reaction studies in the R3B setup at FAIR and show examples of prototype developments and its applications in the current R3B/Cave-C e.g. for neutron-rich oxygen isotopes.
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• 5:00 pm -- Seminar für Kern- und Kosmochemie
  Seminarraum Bau T, MPI für Chemie, Becherweg 25 Mainz

  Philippe Claeys, Vrije Universiteit Brussels:

  "Impacts throughout geological history: The good, the bad and the maybes"

  
  

• 5:00 pm -- Physikalisches Kolloquium
  Hörsaal 100, Heinrich-Plett-Straße 40 Kassel

  Prof. Dr. Christiane Koch, Fachbereich Mathematik und Naturwissenschaften:

  "Antrittsvorlesung: Toward the coherent control of light-induced binary reactions"

  
  

• 5:00 pm -- Physikalisches Kolloquium
  Kirchhoff-Institut für Physik, INF 227, HS 1 Heidelberg

  Prof. Chris Greene, Department of Physics and JILA, University of Colorado, Boulder:

  "Universal Few-Body Physics: from Nuclear Physics to the Ultracold"

  
  

• 5:15 pm -- Physikalisches Kolloquium
  Hörsaal S2/14/24, Institut für Kernphysik, Schlossgartenstr. 9 Darmstadt

  Prof. Dr. Michael Kobel, Institut f. Kern- und Teilchenphysik, TU Dresden:

  "The importance of particle masses and the search for their origin at CERN's Large Hadron Collider"

  
  

• 2:30 pm -- Physik dichter Plasmen mit Schwerionen- und Laserstrahlen
  Seminarraum Theorie, Südbau, III. Stock GSI

  Tim Rienecker and Steffen Faik, Goethe University, Frankfurt and Plasma Physics Dept. of GSI, Darmstadt:

  "Experimental and numerical investigations of a combined hohlraum target for experiments on heavy ion stopping in plasmas"

  The unique combination of a Petawatt High-Energy Laser System for ion beam experiments – “Phelix” (Nd:glass) - and heavy ion beams of the UNILAC accelerator at GSI allows the investigation of the heavy ion stopping in dense laser produced plasmas. In order to gain a high degree of plasma homogeneity during the ion–plasma interaction time of 3–5 ns, a combined hohlraum-target concept has been investigated, where the cold matter is volumetrically heated by means of X-rays generated in a gold hohlraum. The application of low density CHO-foam layers for plasma production has demonstrated high hydrodynamic stability and uniformity of plasma compared to the solid density foils of the same areal density. The set of X-ray diagnostics used in the experiments allows obtaining spectral, temporal and spatial information about the hohlraum plasma and the X-ray heated low density foams. Currently, the first combined experiment on the stopp¬ing of 4.77 MeV/u Ti-ions in hohlraum heated foams has been carried out. The results on the Ti-ion stopping in indirectly heated 2 mg/cc TAC-foam layers show the increase in the plasma stopping power by up to a factor 1.5 – 2 compared to the cold foam target. Theoretical modeling of hohlraums requires sophisticated hydrodynamic simul¬at¬ions with radiation transport. In this presentation the results of a 2D simulation of the empty cylindrical gold hohlraum used in the recent experiments are presented. As a further step, the simulated configuration was augmented with a carbon foam on a copper washer. It is shown that for the recently used ion-stopping measurement setup the current target configuration can provide a homogeneous plasma state of the foam with the plasma temperature of 20 – 40 eV for about 14 ns. Furthermore, the simulation explains the experimentally observed rise in the ion stopping between the first and the second ion bunches and shows how the target dimensions can be changed to maintain adequate plasma conditions for the second ion bunch.
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• 5:00 pm -- Physikalisches Kolloquium
  Hörsaal des Instituts für Kernphysik, Becherweg 45 Mainz

  Prof. Dr. Massimo Inguscio, LENS and Dipartimento di Fisica e Astronomia, Università di Firenze, INO-CNR:

  "Simulation of disorder physics with ultra-cold atoms"

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• 11:00 am -- Atomphysik-Seminar
  Vorraum Atomphysik, Südbau, II. Stock GSI

  Dietrich Bernhardt, Univ. Giessen:

  "Dielectronic recombination of lithium- and berylliumlike xenon ions"

  In recent years dielectronic recombination was developed from the study of the recombination process itself to a tool which allows to study plasma rate coefficients, excitation energies, isotope effects and transition rates of highly charged ions. Here, experimental results for the dielectronic recombination (DR) of lithium- and berylliumlike xenon ions are presented. Absolute rate coefficients for DR have been measured at the heavy-ion storage ring ESR. For the measurement the electron cooler was alternatingly used as an electron target and for ion-beam cooling. The investigated center-of-mass energy range 0 - 550 eV covers all DR resonances belonging to the intra-L-shell excitations. Measurements are compared with multiconfiguration Dirac-Fock calculations. Intra-L-shell excitation energies are extracted from the measured DR spectra and are compared with calculations and spectroscopic results. For berylliumlike xenon in addition to the prominent ground-state DR resonances, DR associated with metastable 2s2p 3P0 parent ions was also observed. For the investigated xenon isotope no single-photon deexcitations of this state are allowed. Thus, this state is long-lived with a E1M1 two-photon transition to the ground state being its dominant decay channel. The depopulation of the metastable beamfraction is observed and compared with theoretical predictions for the E1M1 two-photon-transitions. DR resonance spectroscopy seems to be well suited for further studies of E1M1 two-photon-transitions in heavy berylliumlike ions.
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• 5:00 pm -- Seminar für Kern- und Kosmochemie
  Seminarraum Bau T, MPI für Chemie, Becherweg 25 Mainz

  Yves Marocchi, CRPG-CNRS, Nancy:

  "Sulfur behavior in chondrule formation"

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• 5:00 pm -- Physikalisches Kolloquium
  Großer Hörsaal, Raum 0.111, Max-von-Laue-Str. 1 Frankfurt

  Prof. Dr. Jozef Spalek, Leiter des Condensed Matter Theory and Nanophysics Departments des Marian Smoluchowski Institutes of Physics, Jagiellonian University, Krakau (Polen) :

  "Supraconductivity from magnetism: selected topics in high-temperature and heavy-fermion superconductivity"

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• 3:00 pm -- Biophysics Seminar
  Seminarraum Theorie, Südbau, III. Stock GSI

  Bruno Merk, GSI:

  "A laser microbeam for the heavy-ion microbeam "

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• 4:00 pm -- Seminar über Atomphysik
  Strahlenzentrum, Leihgesterner Weg 217, Seminarraum, EG, Raum 023 Gießen

  Dr. Kristof Holste, Institut für Atom- und Molekülphysik, Universität Giessen:

  "Methoden und Anwendungen der Elektronenspektroskopie"

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• 5:00 pm -- Physikalisches Kolloquium
  Kirchhoff-Institut, INF 227, Otto-Haxel-Hörsaal Heidelberg

  Prof. Nir Davidson, Weizmann Institute of Science, Rehovot:

  "Cold atom collisions and long coherence times: the good, the bad and the ugly"

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• 5:15 pm -- Physikalisches Kolloquium
  Hörsaal S2/14/24, Institut für Kernphysik, Schlossgartenstr. 9 Darmstadt

  Prof. Dr. Gabriel Martinez-Pinedo, Institut f. Kernphysik, TU Darmstadt:

  "Antrittsvorlesung: Explosive nucleosynthesis of heavy elements: current challenges and future possibilities"

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• 10:00 am -- IT/EE-Palaver
  Seminarraum Theorie, Südbau, III. Stock GSI

  Stefan Haller, GSI:

  "Konferenzbericht Linuxtag 2012"

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• 11:00 am -- Atomphysik-Seminar
  Vorraum Atomphysik, Südbau, II. Stock GSI

  Stanislav Tashenov, Univ. Heidelberg:

  "Spin dynamics of electrons in strong fields studied via bremsstrahlung from a polarized electron beam"

  Linear polarization of hard x-rays emitted in the process of the atomic field electron bremsstrahlung has been measured with a polarized electron beam. The correlation between the initial orientation of the electron spin and the angle of photon polarization has been systematically studied by means of Compton and Rayleigh polarimetry techniques applied to a segmented germanium detector. The results are in a good agreement with the fully-relativistic calculations. They are also explained classically and in a unique way manifest that due to the spin-orbital interaction the electron scattering trajectory is not confined to a single scattering plane. The developed photon polarimetry technique with a passive scatterer is very efficient and accurate and thus allows for novel applications. Bremsstrahlung polarization correlations lead to a new method of polarimetry of electron beams. Such a method is sensitive to all three components of the electron spin. It can be applied in a broad range of the electron beam energies from ≈100 keV up to a few 10 MeV. The results of the test measurement at 100 keV will be shown. The optimum scheme for electron polarimetry will be analyzed and the relevant theoretical predictions will be presented.
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• 4:15 pm -- HIC for FAIR
  Physik und Technik von Beschleunigern
  Hörsaal S2/17, Raum 103, Schlossgartenstr. 8 Darmstadt

  Dr. Markus Steck, GSI:

  "Storage Rings at GSI and FAIR – Status and New Ideas"

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• 10:00 am -- IT/EE-Palaver
  Seminarraum Theorie, Südbau, III. Stock GSI

  Dr. Daniel Baumeister, Continental Teves AG & Co. oHG:

  "Evaluation of Chip-Level Irradiation Effects in a 32-bit Safety Microcontroller for Automotive Braking Applications"

  A custom-specific microcontroller unit with a dual-redundant lock-step architecture was irradiated with alpha and neutron particles in static and dynamic modes. Static tests were performed on SRAMs. Dynamic tests operate the device in a hardware-in-the-loop setup, executing an anti-lock braking maneuver during irradiation. The lock-step architecture of the microcontroller along with various on-chip monitors provides an increased visibility to system-level single event effects where non-redundant systems supply less monitoring capabilities. Data from the accelerated static and dynamic tests will be discussed and correlated to each other as well as to automotive field return rates.
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