Energy Calibration of the NewSUBARU Storage Ring for Laser Compton-Scattering Gamma Rays and Applications

• Published in: IEEE transactions on nuclear science 2014-06, Vol.61 (3), p.1252-1258
• Main Authors: Utsunomiya, Hiroaki, Shima, Tatsushi, Takahisa, Keiji, Filipescu, Dan Mihai, Tesileanu, Ovidiu, Gheorghe, Ioana, Nyhus, Hilde-Therese, Renstrom, Therese, Yiu-Wing Lui, Kitagawa, Yasuhisa, Amano, Sho, Miyamoto, Shuji
• Format: Article
• Language: English
• Subjects: Calibration; Detectors; Electron accelerators; Electron beams; gamma-ray detection; Laser beams; Measurement by laser beam; Ring lasers; storage ring; Storage rings
• ISSN: 0018-9499; 1558-1578
• DOI: 10.1109/TNS.2014.2312323

Using γ-ray beams produced in the inverse Compton scattering between CO 2 laser photons and relativistic electrons, we have calibrated electron beam energies in the nominal energy range 550-974 MeV at the synchrotron radiation facility New-SUBARU. The laser Compton-scattering (LCS) γ-ray beams were produced at energies from 561 to 1728 keV and detected with a high-purity germanium detector. The electron beam energies were determined by reproducing the full energy peaks of the γ-ray beams by Monte Carlo simulations. The accuracy of the calibration is (5.5 - 9.4) ×10 - 5 . The reproducibility of the electron beam energy is excellent in an independent injection and deceleration. The present energy calibration of the electron beams offers a standard for the energy calibration of high-energy LCS γ-ray beams produced with a Nd:YVO 4 laser. As applications of the energy calibration, we investigated the energy linearity of a 3.5 '' × 4.0 '' LaBr 3 (Ce) detector in the response to γ-rays at energies up to 10 MeV and the energy profile of the high-energy LCS γ-ray beams.