Open AccessGamma-ray-based fusion burn measurements
Author(s) -
R. R. Berggren,
S. E. Caldwell,
J. R. Faulkner,
R. A. Lerche,
J. M. Mack,
K. Moy,
J. A. Oertel,
C. S. Young
Publication year - 2001
Publication title -
review of scientific instruments
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.605
H-Index - 165
eISSN - 1089-7623
pISSN - 0034-6748
DOI - 10.1063/1.1321003
Subject(s) - physics , detector , gamma ray , electromagnetic shielding , optics , monte carlo method , neutron , calorimeter (particle physics) , nuclear physics , cherenkov radiation , statistics , mathematics , quantum mechanics
A gas Cerenkov detector with a 12-MeV threshold for gamma-raydetection has been built for use on the OMEGA laser system to record high-energy gamma rays emitted during DT gas burn. Recording the 16.7-MeV gamma ray while discriminating against the lower energy 14-MeV neutron-induced gammas is an important objective using this detector system. Detector design, sensitivity, and background studies were possible using the Integrated Tiger Series Monte Carlo code modified to include Cerenkov production and full time-history of all particles. The results of this code were iterated with the ASAP optics code to optimize the light collection system, while providing the radiation shielding and stray light baffles to minimize backgrounds. As an initial test of the instrument, 8–20 MeV electrons from the Idaho State University linear accelerator were used in lieu of gamma rays. The primary results of these tests are that electron-produced Cerenkov has been observed and the Cerenkov threshold curve established for this instrument.
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