Author: Antaya, T.A.
Paper Title Page
MOPS021 Beam Dynamics of a Compact SC Isochronous Cyclotron - Preliminary Study of Central Region* 643
 
  • J.X. Zhang, T.A. Antaya, R.E. Block
    MIT/PSFC, Cambridge, Massachusetts, USA
 
  Funding: Pennsylvania State University ARL S11-07 and N00024-02-D-6604 US Defense Threat Reduction Agency
A compact high field superconducting isochronous cyclotron, Megatron (K250), is designed as a proof-of-principle for a single stage high power proton accelerator. This cyclotron is to accelerate proton to a final energy of 250 MeV with two 45° Dees with a radius ~40 cm. By employing a 20 mA external ECR proton source, the injected proton beam currents at high brightness are foreseen. Using phase selection in the center, a fully magnetized elliptical pole, low energy gain per turn, a precise relation between momentum and radius at large radius are expected. Two goals, a) to use this relationship to develop multi-turn extraction with passive elements only, to achieve a high external proton beam intensity (~1 mA); and b) to see if it is possible to achieve a high extraction efficiency (> 99%) without single turn extraction, with an energy spread |DE/E| ~0.1%. The RF acceleration is on the first harmonic with ωrf=ω0~64 MHz. Superconductor coils will provide a central field of B0 = 4.3 T and a peak hill field of 6.6 T. The general beam dynamics studies will be performed. Precise central field design including space charge effect will be shown in the presentation.