2025/02/20 by Fung, W., Hao, Y., Gu, X. +1
#Accelerator Physics (physics.acc-ph) #FOS: Physical sciences #Nuclear Experiment (nucl-ex)
paper · doi:10.48550/arxiv.2502.15847
In order to aid in luminosity maximization at the interaction point (IP), the collision location sIP must be equivalent to the location of the minimum value of the beta function s^*. Accurate optics measurements and s^* movements are therefore essential to luminosity optimization. However, according to current Relativistic Heavy Ion Collider (RHIC) operations measurements, average horizontal beta beat measurements between operating IPs are around 20% along with significant variation in s^* measurements. A sensitivity matrix was shown to successfully move s^* and the linear optics to their desired values using power supply currents at the 8 o'clock interaction region (IR8). A method to measure the linear optics using the one-turn map within IRs was explored and compared with other mature methods. An error analysis was also included for all optics measurements methods. Through these methods, a 10% beat reduction was consistently achieved while moving s^*x as well significant improvement to variations in s^* measurements. These methods used at the RHIC control room will be updated for future linear optics analysis and control.