Beam-based measurement of the center of the new STAR pipe

Robert-Demolaize, G.¹ 

[1]Brookhaven National Lab. (BNL), Upton, NY (United States). Collider-Accelerator Dept.

关键词: BROOKHAVEN RHIC;    APERTURES;    BEAM TRANSPORT;    PIPES;    ALIGNMENT;    ERRORS;    RADIATION DETECTORS;    BEAM POSITION;   

DOI  :  10.2172/1127418
RP-ID  :  BNL--103871-2014-IR
RP-ID  :  BNL--C-A/AP/504
PID  :  OSTI ID: 1127418
Others  :  R&D Project: KBCH139
Others  :  18031
Others  :  Other: KB0202011
Others  :  TRN: US1500101

学科分类：核物理和高能物理

美国|英语

来源: SciTech Connect

【 摘 要 】

During the RHIC Shutdown preceding Run13 for polarized protons, various upgrades were brought to the STAR detector, one of which being the partial installation of the Forward GEM Tracker (FGT). This installation includes a new beam pipe at the center of the detector with an internal radius half the size of what the replaced pipe was, from 40 mm to 20 mm. The following reviews the results of a vertical aperture scans in the STAR interaction region performed at injection energy with both beams, and gives an estimate of the measured transverse offset of the new STAR pipe.