Author: Seidel, M.
Paper Title Page
MOPPT004 Status and Further Development of the PSI High Intensity Proton Facility 37
  • J. Grillenberger, J.M. Humbel, A.C. Mezger, M. Seidel, W. Tron
    PSI, Villigen PSI, Switzerland
  The High Intensity Proton Accelerator Facility of the Paul Scherrer Institut is routinely operated at an average beam power of 1.3 MW. Since the last cyclotron conference several highlights have been achieved. The maximum current extracted from the 590 MeV Ring Cyclotron could be increased from 2.2 mA to 2.4 mA during several beam development shifts. Furthermore, the availability of the facility has reached its highest level to date, beyond 93%. The new neutron source UCN which utilizes the full proton beam in pulsed mode, has been commissioned. To ensure reliable operation in the years to come and to further increase the intensity, an upgrade and refurbishment program is under way. Important parts of this program are the replacement of two resonators in Injector II and the installation of new RF amplifiers.  
TU2PB01 A Study of Multipacting Effects in Large Cyclotron Cavities by Means of Fully 3-Dimensional Simulations 142
  • C. Wang, B. Ji, Y. Lei, P.Z. Li, J.S. Xing, Z.G. Yin, T.J. Zhang
    CIAE, Beijing, People's Republic of China
  • A. Adelmann, A. Gsell, M. Seidel
    PSI, Villigen PSI, Switzerland
  The field emission model and the secondary emission model, as well as 3D boundary geometry handling capabilities, are needed to efficiently and precisely simulate multipacting phenomena. These models have been implemented in OPAL, a parallel framework for charged particle optics in accelerator structures and beam lines. The models and their implementation are carefully benchmarked against a non-stationary multipacting theory. A dedicated multipacting experiment with nanosecond time resolution for the classic parallel plate geometry has also successfully shown the validity of OPAL model. Multipacting phenomena, in the CYCIAE-100 cyclotron, under construction at China Institute of Atomic Energy, are expected to be more severe during the RF conditioning process than in separate-sector cyclotrons. This is because the magnetic fields in the valley are stronger, which may make the impact electrons easier to reach energies that lead to larger multipacting probabilities. We report on simulation results for CYCIAE-100, which gives us an insight view of the multipacting process and help to develop cures to suppress these phenomena.  
slides icon Slides TU2PB01 [7.012 MB]  
Conference Summary  
  • M. Seidel
    PSI, Villigen PSI, Switzerland
  Conference Summary  
slides icon Slides FR2PB03 [11.377 MB]