Spin flipping through an intrinsic depolarizing resonance by strengthening it

Anferov, V. A.
Rinckel, T.
Lee, S. Y.
Chu, C. M.
Wong, V. K.
Ratner, L. G.
Phelps, R. A.
Liu, T. J.
Caussyn, D. D.
Blinov, B. B.
Crandell, D. A.
Berglund, M.
Von Przewoski, B.
Stephenson, E. J.
Krisch, A. D.
Koutin, S. V.
Sperisen, F.
Schwandt, P.
Derbenev, Ya S.
Hu, S. Q.

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Publication date

January 1996

DOI

10.1103/physrevlett.77.1763

ISSN

0031-9007

Journal

Physical Review Letters

Abstract

We recently accelerated a polarized proton beam from 95 to 380 MeV through both the Gγ = 2 imperfection depolarizing resonance and the Gγ = 7 -vγintrinsic depolarizing resonance. The imperfection resonance flipped the spin, while the intrinsic resonance initially caused partial depolarization. We then pulsed a vertical kicker magnet for about 500 ns to increase the beam's vertical betatron amplitude; this made the intrinsic resonance much stronger. By varying the strength and start time of the kicker, we observed a sharp spin flip due to the now very strong intrinsic depolarizing resonance.Link_to_subscribed_fulltex