First test of a partial Siberian snake during polarized beam acceleration

• Published in: Physical review letters Vol. 73; no. 12; pp. 1621 - 1623
• Main Authors: Blinov, BB, Chu, CM, Courant, ED, Crandell, DA, Kaufman, WA, Krisch, A, Nurushev, TS, Phelps, RA, Raczkowski, DB, Ratner, LG, Wong, VK, Caussyn, DD, Derbenev, YS, Ellison, TJ, Lee, SY, Rinckel, T, Schwandt, P, Sperisen, F, Stephenson, EJ, von Przewoski B, Baiod, R, Minty, MG, Ohmori, C, Wienands, U
• Format: Journal Article
• Language: English
• Published: United States 19-09-1994
• Subjects: ACCELERATION; ACCELERATORS; BARYONS; BEAMS; CORRECTIONS; CYCLIC ACCELERATORS; DATA; DEPOLARIZATION; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; HADRONS; INFORMATION; MEV RANGE; MEV RANGE 10-100; MEV RANGE 100-1000; NUCLEONS; NUMERICAL DATA; ORIENTATION 430200 > Particle Accelerators > Beam Dynamics, Field Calculations, & Ion Optics; PARTICLE ACCELERATORS; POLARIZED BEAMS; PROTONS; RESONANCE; SPIN ORIENTATION; THEORETICAL DATA
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.73.1621

We recently studied the first acceleration of a spin-polarized beam through a depolarizing resonance using a partial Siberian snake. We accelerated polarized protons from 95 to 140 MeV while ramping a 10% partial Siberian snake along with the acceleration cycle. The 10% partial snake suppressed all observable depolarization due to the [ital G][gamma]=2 imperfection depolarizing resonance which occurred near 108 MeV during acceleration. However, 20% and 30% partial Siberian snakes apparently moved the [ital G][gamma]=7[minus][nu][sub [ital y]] intrinsic depolarizing resonance from near 177 MeV into our energy range; this caused some interesting but not-yet-fully understood depolarization.