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Title: Overcoming Depolarizing Resonances with Dual Helical Partial Siberian Snakes

Abstract

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.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1];  [2];  [3]
  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)
Publication Date:
OSTI Identifier:
21024263
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 99; Journal Issue: 15; Other Information: DOI: 10.1103/PhysRevLett.99.154801; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATION; BEAM INJECTION; BEAM OPTICS; GEV RANGE 01-10; GEV RANGE 10-100; POLARIZATION; POLARIZED BEAMS; PROTON BEAMS; PROTONS; SPIN; SYNCHROTRONS

Citation Formats

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, Lin, F, and Takano, J. Overcoming Depolarizing Resonances with Dual Helical Partial Siberian Snakes. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.99.154801.
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, Lin, F, & Takano, J. Overcoming Depolarizing Resonances with Dual Helical Partial Siberian Snakes. United States. https://doi.org/10.1103/PHYSREVLETT.99.154801
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, Lin, F, and Takano, J. 2007. "Overcoming Depolarizing Resonances with Dual Helical Partial Siberian Snakes". United States. https://doi.org/10.1103/PHYSREVLETT.99.154801.
@article{osti_21024263,
title = {Overcoming Depolarizing Resonances with Dual Helical Partial Siberian Snakes},
author = {Huang, H and Ahrens, L A and Bai, M and Brown, K and Courant, E D and Gardner, C and Glenn, J W and Luccio, A U and MacKay, W W and Okamura, M and Ptitsyn, V and Roser, T and Tepikian, S and Tsoupas, N and Zelenski, A and Zeno, K and Lin, F and Takano, J},
abstractNote = {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.},
doi = {10.1103/PHYSREVLETT.99.154801},
url = {https://www.osti.gov/biblio/21024263}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 15,
volume = 99,
place = {United States},
year = {Fri Oct 12 00:00:00 EDT 2007},
month = {Fri Oct 12 00:00:00 EDT 2007}
}