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      Development of a gamma-ray beam profile monitor for the high-intensity gamma-ray source

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      Date
      2003-10-17
      Author
      Regier, Thomas Zachary
      Type
      Thesis
      Degree Level
      Masters
      Metadata
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      Abstract
      Beam profile monitors provide position and flux distribution information to facilitate the configuration of an experimental apparatus and are an important component of any accelerator facilities beam diagnostic system. Nuclear physics experiments typically involve the incidence of high energy particles or gamma-rays on some target material and the detection of the products of the ensuing interactions. Therefore, knowing the profile of the incident radiation beam is desirable. To address the need for a profile monitor for the High-Intensity Gamma-Ray Source, development of a CCD-based gamma-ray beam profiler was undertaken. The profiler consisted of plastic scintillator, a lens system and a Starlight Express MX5 CCD camera, all contained within a light tight box. The scintillation pattern, created by the interaction between the incident gamma-rays and the scintillator, could be focused onto the CCD. Simulations were used to determine the amount of power that would be absorbed for different beam energies and scintillator thicknesses. The use of a converter material, placed directly against the scintillator to improve power deposition, was also investigated. The system was tested in order to and the camera noise characteristics, the optical resolution and magnification and the systems responsivity to power absorption in the scintillator. Using a 137Cs source, preliminary beam profiles were obtained. By combining the results of the testing and simulation, predictions of the required length of exposure were made. It was determined that a beam with a flux of 10^6/s and a diameter of 2.5 cm could be profiled, using 6.0 mm of plastic scintillator and 0.6 mm of iron converter, to within 5% error per 0.64 mm x 0.91 mm resolving unit, in less than 1 minute.
      Degree
      Master of Science (M.Sc.)
      Department
      Physics and Engineering Physics
      Program
      Physics and Engineering Physics
      Committee
      Kolb, Norman R.; Igarashi, Ru
      Copyright Date
      October 2003
      URI
      http://hdl.handle.net/10388/etd-10282003-163528
      Subject
      CCD beam profile monitor
      High Intensity Gamma-Ray Source
      gamma-ray beam diagnostics
      gamma-ray beam profiling
      beam profiling
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      • Graduate Theses and Dissertations

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