Title: ENERGY CALIBRATION IN THE AGS USING DEPOLARIZATION THROUGH VERTICAL INTRINSIC SPIN RESONANCES
Abstract:The AGS tune jump system consists of two fast pulsed quadrupoles used to accelerate the crossing of 82 horizontal intrinsic resonances. Timing of the tune jumps requires accurate tune and energy measu...The AGS tune jump system consists of two fast pulsed quadrupoles used to accelerate the crossing of 82 horizontal intrinsic resonances. Timing of the tune jumps requires accurate tune and energy measurements. Although cross calibration using measurements of the beam revolution frequency shows good accuracy for most of the AGS energy range it is not adequately sensitive as the beam becomes highly relativistic. This drives a strong interest for a new independent energy measurement method. Reduction in the vertical tune across vertical intrinsic spin resonances can induce significant depolarization of the beam. Therefore it was proposed to use the negative vertical tune shift created by this tune jump system to calibrate the energy measurement at few locations along the AGS acceleration cycle. The fast tune jump, of Q 0:02 within 100 s in the vertical plane, allows to accurately locate the spin resonant condition, independently from orbit or field conditions. Simulations using the AGS Zgoubi online model facilitate the interpretation of the experimental results. This paper introduces the experimental procedure and shows some of the latest results.Read More
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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