Speaker
Yoshihiro Shobuda
(Japan Proton Accelerator Research Complex, Japan Atomic Energy Agency)
Description
The RCS at J-PARC is a kicker-impedance-dominant machine, which exceeds the impedance budget from a classical viewpoint. However, we have achieved a 1-MW beam without transverse feedback by fully utilizing the indirect space charge effect to suppress beam instabilities. Although the indirect space charge effect is beneficial, beam instability can still occur in a high-intensity beam with smaller transverse emittance. To address this, we installed diode stacks and resistors at the ends of the four kicker power cables and have successfully conducted routine operations. This approach opens the door to achieving high-quality, higher-intensity beams, including a 2-MW beam, as no transverse feedback is required.
Author
Yoshihiro Shobuda
(Japan Proton Accelerator Research Complex, Japan Atomic Energy Agency)
