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TUPS03 Closed Orbit Correction in 2 MeV Electron Cooler Section at COSY-Juelich electron, ion, dipole, closed-orbit 92
 
  • L. J. Mao, J. Dietrich, V. Kamerdzhiev, B. Lorentz, H.-J. Stein
    FZJ, Jülich
  A 2 MeV magnetized electron cooling system will be installed in COSY to boost the luminosity for future high density internal target experiments. For an effective electron cooling, the proton beam and electron beam have to overlap coaxially, it lead to the necessity of a good orbit correction in cooler section. Since the toroid magnets, the proton beam orbit distortion is anti-symmetric in horizontal plane. With steerers at each side of cooler, the proton beam can be made coaxial in the cooler and the deflection can be compensated. The distortion caused by bending coils in toroid is symmetric in vertical plane. A four-bump method is suggested for correction. Using the magnetic field data measured in BINP, we calculated the orbit distortion of proton beam at injection energy, and investigated the scheme of closed orbit correction. The simulation of orbit distortion and result of the correction are presented in this paper.  
 
TUPS19 Simulation Study of Barrier Bucket Accumulation with Stochastic Cooling at the GSI ESR accumulation, electron, simulation, kicker 136
 
  • T. Katayama, F. Nolden, G. Schreiber, M. Steck
    GSI, Darmstadt
  • T. Kikuchi
    Nagaoka University of Technology, Nagaoka, Niigata
  • H. Stockhorst
    FZJ, Jülich
  The beam accumulation experiments with use of barrier bucket cavity and stochastic cooling was successfully performed at the ESR, GSI. The two methods of barrier voltage operation, moving barrier and fixed barrier cases were tried, and for some cases the electron cooling was additionally employed as well as the stochastic cooling. In the present paper, the beam accumulation process are simulated with particle tracking method where the cooling force (stochastic and electron cooling), the diffusion force and the barrier voltage force are included as well as the IBS diffusion effects. The simulation results are well in agreement with the experimental results.  
 
TUPS20 Demonstration of Longitudinal Stacking in the ESR with Barrier Buckets and Stochastic Cooling antiproton, kicker, accumulation, synchrotron 140
 
  • M. Steck, C. Dimopoulou, B. Franzke, O. E. Gorda, T. Katayama, F. Nolden, G. Schreiber
    GSI, Darmstadt
  • I. N. Meshkov, A. O. Sidorin, G. V. Trubnikov
    JINR, Dubna, Moscow Region
  • D. Möhl
    CERN, Geneva
  • R. Stassen, H. Stockhorst
    FZJ, Jülich
  Fast longitudinal beam accumulation has been demonstrated in the ESR at GSI with an Ar18+ beam coming from the synchrotron SIS18 at 400 MeV/u. Continuous application of stochastic cooling in all three phase space directions, merges the stack with the new injected bunch. Longitudinal beam compression was achieved by using either short barrier bucket rf pulses or by successive injections onto the unstable fixed point of the rf bucket at h=1. This recent experiment in the ESR provides the proof of principle for the planned longitudinal stacking of pre-cooled antiprotons in the HESR, injected from the CR.  
 
TUPS22 Deceleration of Carbon Ions at the Heavy Ion Storage Ring TSR ion, electron, controls, storage-ring 147
 
  • S. T. Artikova, K. Blaum, M. Grieser, J. Ullrich, A. Wolf
    MPI-K, Heidelberg
  In order to evaluate the beam quality obtained after deceleration of 12C6+ ions at the heavy ion storage ring TSR, it is important to consider the possible sources of beam heating. In our experiments at the TSR Heidelberg carbon ions are injected at an energy of 73.3 MeV and decelerated them to 9.7 MeV in a cycle that includes two steps where beam cooling are applied. In this contribution we discuss the influences of intrabeam scattering (IBS) and the heating mechanisms on circulating ions. We will present results on the deceleration efficiency, the scaling of IBS rates with the beam energy and intensity, and studies of the phase space distribution during deceleration.