Speaker
Description
A detailed study on random resonances was conducted to facilitate further beam power ramp-up in the 3-GeV rapid cycling synchrotron of the Japan Proton Accelerator Research Complex. Systematic experiments employing a low-intensity beam revealed considerable excitation of the 2nd-order random resonances, namely horizontal half-integer and linear sum resonances, located just above the current operating point. The half-integer resonance was well compensated by using a trim quadrupole magnet, without simultaneously exciting the other higher-order resonances. Similarly, the linear sum resonance was found to be compensated by making local bumps in the location of sextupole fields. We identified the source of lattice imperfection driving the random resonances as the leakage field from extraction magnets by implementing a theoretical procedure based on resonance driving terms. These resonance compensation schemes have been confirmed to mitigate beam loss even for high-intensity beams and effectively improve the operating point tunability.
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