Methods for Optical Calibration of the BigBite Hadron Spectrometer
Abstract
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%.
Cite
@article{arxiv.1201.1442,
title = {Methods for Optical Calibration of the BigBite Hadron Spectrometer},
author = {M. Mihovilovic and K. Allada and B. D. Anderson and J. R. M. Annand and T. Averett and A. Camsonne and R. W. Chan and J. -P. Chen and K. Chirapatpimol and C. W. de Jager and S. Gilad and D. J. Hamilton and J. -O. Hansen and D. W. Higinbotham and J. Juang and X. Jiang and G. Jin and W. Korsch and J. J. LeRose and R. A. Lindgren and N. Liyanage and E. Long and R. Michaels and B. Moffit and P. Monaghan and V. Nelyubin and B. E. Norum and E. Piasetzky and X. Qian and Y. Qiang and S. Riordan and G. Ron and G. Rosner and B. Sawatzky and M. Shabestari and A. Shahinyan and R. Shneor and S. Sirca and R. Subedi and V. Sulkosky and J. W. Watson and Y. -W. Zhang},
journal= {arXiv preprint arXiv:1201.1442},
year = {2015}
}
Comments
26 pages, 13 figures