CIAE, Beijing
PSI, Villigen
Abstract: Space charge effects play an important role in high intensity cyclotrons, as the most important collective effects. For cyclotrons with small turn separation, single bunch space charge effects are not the only contribution. The interaction of radially neighboring bunches are also present but their effect has, in greater detail, not yet been investigated. In this paper, for the first time, a new PIC based self-consistent numerical simulation model is presented, which covers neighboring bunch effects and is implemented in a three-dimensional object-oriented parallel code OPAL-cycl, a flavor of the OPAL framework. Apart from the full 3D tracking mode with space charge, the code is also capable to do single particle tracking and betatron tune calculation for ordinary cyclotron machine design. We present simulation results from the PSI 590 MeV Ring cyclotron in the light of the ongoing high intensity upgrade program, with the goal of 1.8 MW CW on target. We will also compare calculations with measurements from the Ring cyclotron.
PSI, Villigen
The cyclotron based high power proton accelerator facility at PSI drives a neutron spallation source and two Meson production targets with a CW proton beam at 590MeV kinetic energy. This talk concentrates on the operational and technical aspects specific to acceleration and transport of a high power beam. Furthermore a summary on upgrade plans to increase the beam power from presently 1.2MW to 1.8MW will be given.
RIKEN/RARF/CC, Saitama
RIKEN Nishina Center, Wako, Saitama
ANL, Argonne, Illinois
The accelerator complex for RIBF factory in RIKEN consists of the four ring cyclotrons with an injector linac. It can boost the energy of output beams from the linac up to 440 MeV/nucleon for light ions and 350 MeV/nucleon for very heavy ions. The first beam from the accelerator complex was successfully extracted at the end of 2006. An 28GHz SC-ECR ion source will be installed at the front end of the injector linac on a 100kV HV platform to increase the beam intensity of very heavy ions such as uranium. Beam dynamics from the ion source to the exit of the injector were simulated using TRACK. How much space charge forces affect on beam qualities in the successive ring cyclotrons will be discussed.