Author: Grieser, M.
Paper Title Page
TUPC082 Beam Current Measurements at the TSR Heidelberg 1195
 
  • M. Grieser, S.T. Artikova, K. Blaum, F. Laux, J. Ullrich
    MPI-K, Heidelberg, Germany
 
  To conduct experiments using low energy ion beams at the TSR heavy ion storage ring, the beam deceleration process must be well understood. During deceleration of the beam the revolution frequency decreases, resulting in low current, which is difficult to measure with a common DC transformer. The number of particles in a bunch is determined by measuring the voltage signal in the time domain using a capacitive pick-up. If the ratio of bunch length and RF period does not change during the deceleration or acceleration, measuring the pick-up signal spectrum, where the signal is directly proportional to the number of particles in a bunch, is a more sensitive method. An alternative method is using a beam profile monitor (BPM) for determining the number of particles in the storage ring via ionization rate measurements of the residual gas. A summary of these different methods to determine the number of particles is presented.  
 
WEPS005 Investigation of Intrabeam Scattering in the Heavy Ion Storage Ring TSR 2490
 
  • S.T. Artikova, M. Grieser, J. Ullrich
    MPI-K, Heidelberg, Germany
 
  Intrabeam scattering (IBS) is a multiple scattering effect between stored beam particles. It leads to diffusion in all three spatial dimensions and thus, causes an expansion of the whole beam. IBS plays an important role in the equilibrium diameter of a low-velocity, electron-cooled ion beam. IBS effects for coasting and bunched 12C6+ ion beams at an energy of 73.3 MeV were studied using the TSR heavy ion cooler storage ring. Experimental results of the IBS rates are presented.  
 
THPS006 Present Status of Beam Cooling and Related Research at S-LSR 3436
 
  • A. Noda, M. Nakao, H. Souda, H. Tongu
    Kyoto ICR, Uji, Kyoto, Japan
  • T. Fujimoto, S.I. Iwata, S. Shibuya
    AEC, Chiba, Japan
  • M. Grieser
    MPI-K, Heidelberg, Germany
  • K. Ito, H. Okamoto
    HU/AdSM, Higashi-Hiroshima, Japan
  • K. Jimbo
    Kyoto IAE, Kyoto, Japan
  • K. Noda, T. Shirai
    NIRS, Chiba-shi, Japan
 
  Funding: Work supported by Advanced Compact Accelerator Development project of MEXT, and Global COE Program, "The Next Generation of Physics, Spun from Universality and Emergence" at Kyoto University.
With the use of Ion Storage and Cooler Ring, S-LSR at ICR, Kyoto University, Mg ion beam with 40 keV has been laser cooled not only in the longitudinal direction but also in the horizontal direction by "Synchro-Betatron Coupling". Laser cooling is now tried to be extended to vertical direction with horizontal and vertical coupling with the use of a solenoid magnetic field. At S-LSR, an electron beam cooling is also applied for 7MeV proton beam, resulting an ordered state. Electron beam cooling is also applied for rf captured bunched beam and a short pulse proton beam with the duration of ~3 ns is fast extracted in order to enable beam irradiation. A beam course is now being constructed to irradiate bio-molecular cells vertically from the bottom through a thin film separating the accelerator vacuum from the cultivating liquid containing the cells in the air.