The AGS with four helical magnets

Tsoupas, N. ; Huang, H. ; MacKay, W.W. ; Roser, T. ; Trbojevic, D.

关键词: ACCELERATION;    BEAM INJECTION;    BETATRONS;    MAGNETS;    MODIFICATIONS;    OPTICAL PROPERTIES;    OPTICS;    POLARIZATION;    PROTON BEAMS;    SPIN relativistic heavy ion collider;   

DOI  :  10.2172/973140
RP-ID  :  BNL--91115-2010-IR
PID  :  OSTI ID: 973140
Others  :  R&D Project: KBCH139
Others  :  Other: KB0202011
Others  :  TRN: US1001902

学科分类：核物理和高能物理

美国|英语

来源: SciTech Connect

【 摘 要 】

The idea of using multiple partial helical magnets was applied successfully to the AGS synchrotron, to preserve the proton beam polarization. In this paper we explore in details the idea of using four helical magnets placed symmetrically in the AGS ring. This modification provides many advantages over the present setup of the AGS that uses two partial helical magnets. First, it provides a larger 'spin tune gap' for the placement of the vertical betatron tune of the AGS during acceleration, second, the vertical spin direction during the beam injection and extraction is closer to vertical, third, the symmetric placement of the snakes allows for a better control of the AGS optics, and for reduced values of the beta and eta functions, especially near injection, fourth, the optical properties of the helical magnets also favor the placement of the horizontal betatron tune in the 'spin tune gap', thus eliminating the horizontal spin resonances. In this paper we provide results on the spin tune and on the optics of the AGS with four partial helical magnets, and we compare these results with the present setup of the AGS that uses two partial helical magnets.