Observation of a Second-Order Spin-Depolarizing Resonance

Journal Article · Mon Sep 04 04:00:00 EDT 1995 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.75.1931· OSTI ID:250497

Ohmori, C; Sato, H ^[1]; Alexeeva, L V; Anferov, V A; Caussyn, D D; Chu, C M; Crandell, D A; Gladycheva, S E; Hu, S; Krisch, A D; Phelps, R A; Varzar, S M; Wong, V K ^[2]; Lee, S Y; Rinckel, T; Schwandt, P; Sperisen, F; Stephenson, E J; von Przewoski, B ^[3]; Baiod, R ; Russell, A D ^[4]

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1. KEK, National Laboratory for High Energy Physics, Tsukuba, Ibaraki 305 (Japan)
2. Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120 (United States)
3. Indiana University Cyclotron Facility, Bloomington, Indiana 47408-0768 (United States)
4. Fermilab, Batavia, Illinois 60510 (United States)

A recent experiment using a 160 MeV stored spin-polarized proton beam found clear evidence for a second-order intrinsic depolarizing resonance. With a 20% partial Siberian snake, we studied a first-order intrinsic depolarizing resonance; we then discovered and studied the second-order depolarizing resonance by changing both the horizontal and vertical betatron tunes. As expected, this second-order resonance is much weaker than the first-order resonance; it is probably due to sextupole fields plus coupling between the horizontal and vertical betatron oscillations caused by the 20% snake.

• OSTI ID: 250497
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 75; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
66 PHYSICS
BETATRON OSCILLATIONS
COUPLING
DEPOLARIZATION
POLARIZED BEAMS
PROTON BEAMS
RESONANCE
SPIN