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Title: Methods for Optical Calibration of the BigBite Hadron Spectrometer

Methods for Optical Calibration of the BigBite Hadron Spectrometer The techniques for optical calibration of Jefferson Lab's large-acceptance magnetic hadron spectrometer, BigBite, have been examined. The most consistent and stable results were obtained by using a method based on singular value decomposition. In spite of the complexity of the optics, the particles positions and momenta at the target have been precisely reconstructed from the coordinates measured in the detectors by means of a single back-tracing matrix. The technique is applicable to any similar magnetic spectrometer and any particle type. For 0.55 GeV/c protons, we have established the vertex resolution of 1.2 cm, angular resolutions of 7 mrad and 16 mrad (in-plane and out-of-plane, respectively), and a relative momentum resolution of 1.6%.
Authors:
Publication Date:
OSTI Identifier:OSTI ID: 1043258
Report Number(s):JLAB-PHY-12-1410; DOE/OR/23177-1973; arXiv:1201.1442
Journal ID: ISSN 0168-9002; NIMAER; TRN: US1203051
DOE Contract Number:AC05-06OR23177
Resource Type:Journal Article
Resource Relation:Journal Name: Nuclear Instruments and Methods in Physics Research, Section A; Journal Volume: 686
Research Org:Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:USDOE Office of Science (SC)
Country of Publication:United States
Language:English
Subject: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CALIBRATION; HADRONS; MAGNETIC SPECTROMETERS; OPTICS; PROTONS; RESOLUTION; SPECTROMETERS; TARGETS