D H H Hoffmann

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The super proton synchrotron, SPS is used as LHC in-jector, but also to accelerate and extract protons and ions for fixed target experiments and for producing neutrinos (CNGS). In particular the risks during the fast extraction of LHC and CNGS beams must be considered since any failure during this process can lead to serious equipment damage.When the SPS(More)
  • S Andriamonje, S Aune, D Autiero, K Barth, A Belov, B Beltrán +21 others
  • 2007
We have searched for solar axions or similar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup with improved conditions in all detectors. From the absence of excess X-rays when the magnet was pointing to the Sun, we set an upper limit on the axion-photon coupling of g aγ < 8.8×10 −11 GeV −1 at 95% CL for m a ∼ < 0.02(More)
Intense heavy ion beams from the Gesellschaft für Schwerionenforschung ~GSI, Darmstadt, Germany! accelerator facilities, together with two high energy laser systems: petawatt high energy laser for ion experiments ~PHELIX! and nanosecond high energy laser for ion experiments ~NHELIX! are a unique combination to facilitate pioneering beam-plasma interaction(More)
  • G Schaumann, M S Schollmeier, G Rodriguez-Prieto, A Blazevic, E Brambrink, M Geissel +5 others
  • 2005
High energy heavy ions were generated in laser produced plasma at moderate laser energy, with a large focal spot size of 0.5 mm diameter. The laser beam was provided by the 10 GW GSI-NHELIX laser systems, and the ions were observed spectroscopically in status nascendi with high spatial and spectral resolution. Due to the focal geometry, plasma jet was(More)
  • D Penache, C Niemann, A Tauschwitz, R Knobloch, S Neff, R Birkner +5 others
  • 2002
In inertial confinement fusion driven by heavy ions a critical issue is the transport of the ion beams through the reactor chamber. To successfully achieve ignition of the fuel pellet the ion beam must have a very well defined temporal and geometrical shape at the target position. In all plant scenarios the reactor has radii of 3-5 m and in some is(More)
We have searched for solar axions or other pseudoscalar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup. Whereas we previously have reported results from CAST with evacuated magnet bores (Phase I), setting limits on lower mass axions, here we report results from CAST where the magnet bores were filled with 4 He gas(More)
  • N A Tahir, V Kim, A Shutov, I V Lomonosov, A Matveichev, A Ostrik +3 others
  • 2007
In August 2007, experiments were carried out at the HHT experimental area to study thermal stress waves induced by uranium beam in targets made of different materials. This work is of importance to development of a solid target for the Super-FRS at FAIR [1]. The following beam and target parameters have been used in these experiments. The target is cylinder(More)
  • S Korostiy, O Rosmej, A Blazevic, D Varentsov, A Fertman, V Turtikov +4 others
  • 2006
Experimental investigations of the slowing-down process of calcium projectile ions traveling through the neon gas were carried out at the UNILAC facility at GSI in the frame of the project U-189 " X-ray spectroscopy of projectile ion and target radiation ". The main goal was to demonstrate the influence of the target density on the charge state distribution(More)
An analytical model for the linear Richtmyer-Meshkov instability in solids under conditions of high-energy density is presented, in order to describe the evolution of small perturbations at the solid-vacuum interface. The model shows that plasticity determines the maximum perturbation amplitude and provides simple scaling laws for it as well as for the time(More)