Crossing intrinsic depolarizing resonances by varying a partial Siberian snake

Journal Article · Sun Mar 31 23:00:00 EST 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.76.2714· OSTI ID:284489

Alexeeva, L V; Anferov, V A; Crandell, D A; Hu, S; Krisch, A D; Phelps, R A; Ratner, L G; Varzar, S M; Wong, V K ^[1]; Lee, S Y; Rinckel, T; Schwandt, P; Sperisen, F; Stephenson, E J; von Przewoski, B ^[2]; Baiod, R; Martin, P S; Russell, A D ^[3]; Sato, H ^[4]; Minty, M G ^[5]

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1. Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120 (United States)
2. Indiana University Cyclotron Facility, Bloomington, Indiana 47408-0768 (United States)
3. Fermilab, Batavia, Illinois 60510 (United States)
4. KEK, National Laboratory for High Energy Physics, Tsukuba, Ibaraki 305 (Japan)
5. Stanford Linear Accelerator Center, Stanford, California 94309 (United States)

We recently forced a 140 MeV polarized proton beam to cross intrinsic depolarizing resonances by varying a partial Siberian snake{close_quote}s strength for different values of the vertical and horizontal betatron tunes {nu}{sub {ital y}} and {nu}{sub {ital x}}. A weak second-order intrinsic resonance was observed in the {nu}{sub {ital x}} sweep; moreover, an unexpected partial spin flip was found in the {nu}{sub {ital y}} sweep. We also varied the snake ramp time to identify the {nu}{sub {ital y}} and {nu}{sub {ital x}} regions where the resonance crossings occurred during the snake variation; in these crossings the polarization partially deviated from Froissart-Stora behavior. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 284489
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 15 Vol. 76; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
66 PHYSICS
BETATRON OSCILLATIONS
BETATRONS
CROSSING-OVER
POLARIZATION
POLARIZED BEAMS
PROTON BEAMS
RESONANCE
SPIN FLIP