IPAC'24 - 15th International Particle Accelerator Conference

Direct measurements of RHIC BPM data at the IP using linear regression

SUPG003

19 May 2024, 14:00

4h

Bluegrass (MCC Exhibit Hall A)

Student Poster Presentation MC5.D01 Beam Optics Lattices, Correction Schemes, Transport Student Poster Session

Speaker

William Fung (Facility for Rare Isotope Beams)

Description

Many mature methods to measure the betatron function of a lattice rely on beam position monitor (BPM) data and the model of the whole machine. In this study, specific sections of the Relativistic Heavy Ion Collider (RHIC) were analyzed, taking advantage of BPMs separated by drift spaces near interaction points (IPs) and B3/B4 magnet sections of RHIC. This (local) approach would provide a alternative measure of the linear optics at specific regions which can be compared to previous (global) methods. This process utilizes the phase transfer matrix built from existing BPM data from RHIC using Linear Regression (LR) techniques. Non-AC dipole BPM data as well as AC dipole data was used to measure the linear optics. It was found that the local method yields comparable beta beat to global methods; however, it differs significantly around IP6. This study demonstrates that using LR analysis has advantages and disadvantages, and that further studies are needed to improve the method.