Higher Order Spin Resonances in a 2.1 GeV/c Polarized Proton Beam

Details Higher Order Spin Resonances in a 2.1 GeV/c Polarized Proton Beam Higher Order Spin Resonances in a 2.1 GeV/c Polarized Proton Beam

2012-04-26

arxiv.org/abs/1204.6002v1

Physical Review Letters 108, 074801 (2012)

Physics

Accelerator Physics

5 pages, 5 figures Note that Fig. 5 did not appear in the PRL due to space limitation, but did appear in the March 2012 CERN C

Scientific paper

Spin resonances can depolarize or spin-flip a polarized beam. We studied 1st and higher order spin resonances with stored 2.1 GeV/c vertically polarized protons. The 1st order vertical ({\nu}y) resonance caused almost full spin-flip, while some higher order {\nu}y resonances caused partial depolarization. The 1st order horizontal ({\nu}x) resonance caused almost full depolarization, while some higher order {\nu}x resonances again caused partial depolarization. Moreover, a 2nd order {\nu}x resonance is about as strong as some 3rd order {\nu}x resonances, while some 3rd order {\nu}y resonances are much stronger than a 2nd order {\nu}y resonance. One thought that {\nu}y spin resonances are far stronger than {\nu}x, and that lower order resonances are stronger than higher order; the data do not support this.

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