Author/Authors :
Stepanyan، نويسنده , , S. and Boyarinov، نويسنده , , S. and Egiyan، نويسنده , , H. and Guo، نويسنده , , L. and Dale، نويسنده , , D. and Gabrielyan، نويسنده , , M. and Gan، نويسنده , , L. and Gasparian، نويسنده , , A. and Glamazdin، نويسنده , , A. and Mecking، نويسنده , , B. and Nakagawa، نويسنده , , I. and Teymurazyan، نويسنده , , A. and Wood، نويسنده , , M.H.، نويسنده ,
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 % E γ . 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 .
Keywords :
Photon tagger , Photon beam , Energy corrections , Pair spectrometer , CLAS , Micro-strip detector
