17–22 May 2026
C.I.D
Europe/Zurich timezone

Compensation of second-order random resonances in the J-PARC RCS

WEP4604
20 May 2026, 16:00
2h
C.I.D

C.I.D

Deauville, France
Poster Presentation MC4.A04: Hadron accelerators: Circular Accelerators Poster session

Speaker

Kunihiro Kojima (Japan Atomic Energy Agency)

Description

In the J-PARC 3-GeV rapid cycling synchrotron, second-order random resonances are excited by shifting the operating point to a higher tune side. To mitigate resonance-induced beam loss and further enhance tunability of the operating point, we studied the compensation of second-order resonances. By controlling the timing when the beam approaches resonance through adjusting the momentum offset and chromaticity-induced tune shift, the optimal resonance compensation is explored, considering the time dependence of lattice imperfections that drive the resonances. The analysis of resonance driving terms and numerical simulation was employed to deepen the understanding of the lattice imperfections. In this article, details of the method and experimental results will be reported.

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Author

Kunihiro Kojima (Japan Atomic Energy Agency)

Co-authors

Hiroyuki Harada (Japan Atomic Energy Agency) Motoki Chimura (Japan Atomic Energy Agency) Pranab Saha (Japan Proton Accelerator Research Complex)

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