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

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.
Authors:
 [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Collider-Accelerator Dept.
Publication Date:
OSTI Identifier:
1127418
Report Number(s):
BNL--103871-2014-IR; BNL--C-A/AP/504
R&D Project: KBCH139; 18031; KB0202011; TRN: US1500101
DOE Contract Number:
AC02-98CH10886
Resource Type:
Technical Report
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BROOKHAVEN RHIC; APERTURES; BEAM TRANSPORT; PIPES; ALIGNMENT; ERRORS; RADIATION DETECTORS; BEAM POSITION