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

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)654-661
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume572
Issue number2
DOIs
StatePublished - Mar 11 2007

Bibliographical note

Funding Information:
We would like to acknowledge the outstanding efforts of the staff of the Accelerator and Physics Divisions at Jefferson Lab who made this measurements possible. We particularly wish to thank the Hall B technical staff for exceptional work in the installation of the experiment. Acknowledgments for the support go also to the National Science Foundation, MRI Grant PHY-0079840, Grants PHY-0457246, PHY-0099487, and PHY-0072391. This work authored by The Southeastern Universities Research Association, Inc. under U.S. DOE Contract No. DE-AC05-84150. The U.S. Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce this manuscript for U.S. Government purposes.

Keywords

  • CLAS
  • Energy corrections
  • Micro-strip detector
  • Pair spectrometer
  • Photon beam
  • Photon tagger

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