Speaker
Description
Nonlinear resonance crossing, which takes place under the conditions of a large space-charge tune spread and magnetic field errors, is one of the most important dynamic issues that limit the beam current and power of heavy-ion synchrotrons. In HIAF-BRing, space charge induced resonance crossing is very significant at injection plateau as the energy is low to tenth of MeV/u while the intensity can be up to the order of magnitude of 11. Large beam loss may lead to difficulties in long-term machine operation and maintenance. To address this detrimental issue, resonance compensations, which employ dedicated multipoles for corresponding resonance lines, become necessity. In practical conditions or the experience gained from previous beam experiments, the classical theory based on the combined resonance driving terms (CRDTs) allows a perfect resonance compensation through precisely pre-known TWISS parameters. In this contribution, the simulation study on the simultaneous compensation of five third-order resonances in BRing will be presented. The physical control program designed for automatic measurement and correction of nonlinear resonances will be introduced and the procedure will also be outlined for the resonance compensation experiments in BRing.
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