Overcoming Depolarizing Resonances with Dual Helical Partial Siberian Snakes

Journal Article · Fri Oct 12 00:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.99.154801· OSTI ID:21024263

Huang, H; Ahrens, L A; Bai, M; Brown, K; Courant, E D; Gardner, C; Glenn, J W; Luccio, A U; MacKay, W W; Okamura, M; Ptitsyn, V; Roser, T; Tepikian, S; Tsoupas, N; Zelenski, A; Zeno, K ^[1]; Lin, F ^[2]; Takano, J ^[3]

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1. Brookhaven National Laboratory, Upton, New York 11973 (United States)
2. Indiana University, Bloomington, Indiana 47405 (United States)
3. RIKEN, Wako, Saitama, 315-0198 (Japan)

Acceleration of polarized protons in the energy range of 5 to 25 GeV is challenging. In a medium energy accelerator, the depolarizing spin resonances are strong enough to cause significant polarization loss but full Siberian snakes cause intolerably large orbit excursions and are also not feasible since straight sections usually are too short. Recently, two helical partial Siberian snakes with double pitch design have been installed in the Brookhaven Alternating Gradient Synchrotron (AGS). With a careful setup of optics at injection and along the energy ramp, this combination can eliminate the intrinsic and imperfection depolarizing resonances otherwise encountered during acceleration to maintain a high intensity polarized beam in medium energy synchrotrons. The observation of partial snake resonances of higher than second order will also be described.

• OSTI ID: 21024263
• Journal Information: Physical Review Letters, Vol. 99, Issue 15; Other Information: DOI: 10.1103/PhysRevLett.99.154801; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATION
BEAM INJECTION
BEAM OPTICS
GEV RANGE 01-10
GEV RANGE 10-100
POLARIZATION
POLARIZED BEAMS
PROTON BEAMS
PROTONS
SPIN
SYNCHROTRONS