Tune Optimization for Alleviating Space Charge Effects and Suppressing Beam Instability in the RCS of CSNS
Mar 21, 20243 pages
Published in:
- JACoW HB2023 (2024) WEA2C1
Contribution to:
- Published: Mar 21, 2024
Citations per year
Abstract: (JACOW)
The design betatron tune of the Rapid Cycling Synchrotron (RCS) of China Spallation Neutron Source (CSNS) is (4.86, 4.80), which allows for incoherent tune shifts to avoid serious systematic betatron resonances. When the operational bare tune was set at the design value, serious beam instability in the horizontal plane and beam loss induced by half-integer resonance in the vertical plane under space charge detuning were observed. The tunes over the whole acceleration process are optimized based on space charge effects and beam instability. In the RCS, manipulating the tune during the beam acceleration process is a challenge due to the quadrupole magnets being powered by resonant circuits. In the RCS of CSNS, a method of waveform compensation for RCS magnets was investigated to accurately manipulate the magnetic field ramping process. The optimized tune pattern was able to well control the beam loss induced by space charge and beam instability. The beam power of CSNS achieved the design value of 100 kW with small uncontrolled beam loss.- space-charge
- resonance
- acceleration
- ECR
- simulation
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