Investigation of residual vertical intrinsic resonances with dual partial Siberian snakes in the AGS

Author

Lin, F. ; Lee, S.Y. ; Ahrens, L.A. ; Bai, M. ; Brown, K.A. ; Courant, E.D. ; Glenn, J.W. ; Huang, H. ; Luccio, A.U. ; MacKay, W.W. ; Roser, T. ; Tsoupas, N.

Author_Institution

Indiana Univ., Bloomington

fYear

2007

fDate

25-29 June 2007

Firstpage

3534

Lastpage

3536

Abstract

Two partial helical dipole snakes were found to be able to overcome all imperfection and intrinsic spin resonances provided that the vertical betatron tunes were maintained in the spin tune gap near the integer 9. Recent vertical betatron tune scan showed that the two weak resonances at the beginning of the acceleration cycle may be the cause of polarization loss. This result has been confirmed by the vertical polarization profile measurement, and spin tracking simulations. Possible cure of the remaining beam polarization is discussed.

Keywords

beam handling equipment; betatrons; particle beam injection; proton accelerators; proton polarisation; synchrotrons; AGS; dual partial Siberian snakes; intrinsic spin resonances; partial helical dipole snakes; polarized proton beam injection; spin polarization loss; spin tracking simulations; spin tune gap; vertical betatron tunes; Acceleration; Frequency; Laboratories; Lattices; Magnetic fields; Magnetic resonance; Particle beams; Polarization; Protons; Synchrotrons;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2007. PAC. IEEE

Conference_Location

Albuquerque, NM

Print_ISBN

978-1-4244-0916-7

Type

conf

DOI

10.1109/PAC.2007.4440483

Filename

4440483