Abstract
An 11.4% partial Siberian snake was used to successfully accelerate polarized protons through a strong intrinsic depolarizing spin resonance in the Alternating Gradient Synchrotron (AGS). No noticeable depolarization was observed. This opens up the possibility of using a 20% to 30% partial Siberian snake in the AGS or other medium energy proton synchrotrons to overcome all weak and strong depolarizing spin resonances.
Highlights
The high energy spin physics program in the Relativistic Heavy Ion Collider (RHIC) calls for collisions of highly polarized proton beams [1]
Since there is no mechanism for increasing the polarization of protons after they have been injected into RHIC, the level of polarization can only be maximized by increasing the initial polarization of the source and minimizing the depolarization throughout the whole set of accelerators and transfer lines
A depolarizing resonance is crossed whenever the spin precession frequency equals the frequency with which spin-perturbing magnetic fields are encountered
Summary
The high energy spin physics program in the Relativistic Heavy Ion Collider (RHIC) calls for collisions of highly polarized proton beams [1]. The level of polarization is limited primarily by depolarizing resonances during the Alternating Gradient Synchrotron (AGS) energy ramp. Acceleration of polarized proton beams to high energy in circular accelerators is difficult due to numerous depolarizing resonances. A depolarizing resonance is crossed whenever the spin precession frequency equals the frequency with which spin-perturbing magnetic fields are encountered. In the presence of the vertical magnetic dipole guide field in a circular accelerator, the spin precesses G times per orbit revolution, where G g ÿ 2=2 1:7928 is the coefficient of the gyromagnetic anomaly of the proton, and is the Lorentz factor. The number of precessions per revolution is called the spin tune sp and is equal to G in this case
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