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%.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1043258
- Report Number(s):
- JLAB-PHY-12-1410; DOE/OR/23177-1973; arXiv:1201.1442; NIMAER; TRN: US1203051
- Journal Information:
- Nuclear Instruments and Methods in Physics Research, Section A, Vol. 686; ISSN 0168-9002
- Country of Publication:
- United States
- Language:
- English
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