Methods for optical calibration of the BigBite hadron spectrometer

M. Mihovilovič, S. Širca, K. Allada, B. D. Anderson, J. R.M. Annand, T. Averett, A. Camsonne, R. W. Chan, J. P. Chen, K. Chirapatpimol, C. W. De Jager, S. Gilad, D. J. Hamilton, J. O. Hansen, D. W. Higinbotham, J. Huang, X. Jiang, G. Jin, W. Korsch, J. J. LeroseR. A. Lindgren, N. Liyanage, E. Long, R. Michaels, B. Moffit, P. Monaghan, V. Nelyubin, B. E. Norum, E. Piasetzky, X. Qian, Y. Qiang, S. Riordan, G. Ron, G. Rosner, B. Sawatzky, M. Shabestari, A. Shahinyan, R. Shneor, R. Subedi, V. Sulkosky, J. W. Watson, Y. W. Zhang

Research output: Contribution to journalArticlepeer-review


The techniques for the optical calibration of Jefferson Labs large-acceptance magnetic hadron spectrometer, BigBite, have been examined. The most consistent and stable results were obtained 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 a vertex resolution of 1.2 cm, angular resolutions of 7 mrad and 13 mrad (in-plane and out-of-plane, respectively), and a relative momentum resolution of 1.6%.


  • BigBite
  • Magnetic spectrometers
  • Optical calibration
  • Track reconstruction

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation


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