Crossing a coupling spin resonance with an RF dipole

Details Crossing a coupling spin resonance with an RF dipole Crossing a coupling spin resonance with an RF dipole

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..570..741b&link_type=abstract

The fourteenth international spin physics symposium, SPIN2000. AIP Conference Proceedings, Volume 570, pp. 741-745 (2001).

Physics

Synchrotrons, Polarized Beams

Scientific paper

In accelerators, due to quadrupole roll errors and solenoid fields, the polarized proton acceleration often encounters coupling spin resonances. In the Brookhaven AGS, the coupling effect comes from the solenoid partial snake which is used to overcome imperfection resonances. The coupling spin resonance strength is proportional to the amount of coupling as well as the strength of the corresponding intrinsic spin resonance. The coupling resonance can cause substantial beam polarization loss if its corresponding intrinsic spin resonance is very strong. A new method of using an horizontal RF dipole to induce a full spin flip crossing both the intrinsic and its coupling spin resonances is studied in the Brookhaven's AGS. Numerical simulations show that a full spin flip can be induced after crossing the two resonances by using a horizontal RF dipole to induce a large vertical coherent oscillation. .

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