Energy Calibration of the JLab Bremsstrahlung Tagging System
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{sup +}e{sup -} 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{sub {gamma}}. The absolute energy scale was determined using the e{sup +}e{sup -} 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.
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA
- Sponsoring Organization:
- USDOE - Office of Energy Research (ER)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 890520
- Report Number(s):
- JLAB-PHY-06-535; DOE/ER/40150-4009
- Journal Information:
- Nucl.Instrum.Meth.A, Journal Name: Nucl.Instrum.Meth.A Journal Issue: 2 Vol. 572
- Country of Publication:
- United States
- Language:
- English
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