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
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 0.1% Eγ. 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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