Orbit correction in an orbit separated cyclotron
Abstract
The orbit separated proton cyclotron (OSC) described in [1] differs in concept from that of a separated orbit cyclotron (SOC) [2]. Synchronous acceleration in an OSC is based on harmonic number jumps and orbit length adjustments via reverse bending. Four-turn acceleration in the OSC enables it to have four times fewer cryogenic-cavity systems than in a superconducting linac of the same high beam power and energy range.
Initial OSC studies identified a progressive distortion of the spiral beam orbits by the off-axis, transverse deflecting fields in its accelerating cavities. Compensation of the effects of these fields involves the repeated use of a cavity field map, in a 3-D linac tracking code, to determine the modified arc bends required for the OSC ring. Subsequent tracking studies confirm the compensation scheme and show low emittance growth in acceleration.- Publication:
-
Nuclear Instruments and Methods in Physics Research A
- Pub Date:
- April 2014
- DOI:
- 10.1016/j.nima.2014.01.022
- Bibcode:
- 2014NIMPA.744...48P
- Keywords:
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- Field map;
- OSC;
- SOC;
- Tracewin;
- Superfish;
- Microwave Studio