Space Charge Effect on Emittance Exchange by Skew Quadrupoles
نویسنده
چکیده
For high current synchrotron SIS it is crucial to improve the multiturn injection efficiency. We study active emittance exchange due to a second order (skew quadrupole) difference resonance which is modified by the presence of space charge. We start from an analytical expression for the coherent tune shift of this resonance and compared it with computer simulation for the SIS synchrotron lattice including self-consistent space charge calculation. The critical issue is the ratio of incoherent space charge tune shift and resonance width. We apply the results of simulation to the horizontal multiturn injection process with space charge and find an improvement of the injection efficiency from 65 % to 84 % (with a correspondent increase of the vertical emittance) in a typical example.
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