Energy Calibration of the JLab Bremsstrahlung Tagging System

S. Stepanyan; S. Boyarinov; H. Egiyan; L. Guo; D. Dale; M. Gabrielyan; L. Gan; A. Gasparian; A. Glamazdin; B. Mecking; I. Nakagawa; A. Teymurazyan; M. H. Wood

doi:10.1016/j.nima.2006.12.009

arXiv · physics/0608302

Energy Calibration of the JLab Bremsstrahlung Tagging System

S. Stepanyan·S. Boyarinov·H. Egiyan·L. Guo·D. Dale·M. Gabrielyan·L. Gan·A. Gasparian·A. Glamazdin·B. Mecking·I. Nakagawa·A. Teymurazyan·M. H. Wood

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Abstract

In this report, we present the energy calibration of the Hall B bremsstrahlung tagging system at the Thomas Jefferson National Accelerator Facility. The calibration was performed using a magnetic pair spectrometer. The tagged photon energy spectrum was measured in coincidence with $e^+e^-$ pairs as a function of the pair spectrometer magnetic field. Taking advantage of the internal linearity of the pair spectrometer, the energy of the tagging system was calibrated at the level of $\pm 0.1% E_\gamma$. The absolute energy scale was determined using the $e^+e^-$ rate measurements close to the end-point of the photon spectrum. The energy variations across the full tagging range were found to be $<3$ MeV.

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S. Stepanyan, S. Boyarinov, H. Egiyan, L. Guo, D. Dale, M. Gabrielyan, L. Gan, A. Gasparian, A. Glamazdin, B. Mecking, I. Nakagawa, A. Teymurazyan, M. H. Wood. 2006-08-31. Energy Calibration of the JLab Bremsstrahlung Tagging System. https://doi.org/10.1016/j.nima.2006.12.009

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