Title :
Space charge effect on emittance exchange by skew quadrupoles
Author :
Franchetti, G. ; Hofmann, I.
Author_Institution :
Gesellschaft fur Schwerionenforschung mbH, Darmstadt, Germany
Abstract :
For the 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 compare it with a 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
Keywords :
particle beam injection; resonance; space charge; storage rings; synchrotrons; SIS; coherent tune shift; computer simulation; emittance exchange; horizontal multiturn injection; incoherent space charge tune shift; injection efficiency; multiturn injection efficiency; resonance width; second order difference resonance; self-consistent space charge; skew quadrupoles; space charge; synchrotron; vertical emittance; Analytical models; Bandwidth; Computational modeling; Computer simulation; Frequency; Lattices; Optical coupling; Resonance; Space charge; Synchrotrons;
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
DOI :
10.1109/PAC.1999.794258
