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Energy calibration of the JLab bremsstrahlung tagging system

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


Journal:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT


Issue Date:
2007


Abstract(summary):

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%E. 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. (c) 2007 Elsevier B.V. All rights reserved.


Page:
654---661


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