Photonuclear reaction based high-energy x-ray spectrometer to cover from 2 MeV to 20 MeV

A photonuclear-reaction-based hard x-ray spectrometer is developed to measure the number and energy spectrum of fast electrons generated by interactions between plasma and intense laser light. In this spectrometer, x-rays are converted to neutrons through photonuclear reactions, and the neutrons are...

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Bibliographic Details
Published in:Review of scientific instruments 2014-11, Vol.85 (11), p.11D629-11D629
Main Authors: Sakata, S, Arikawa, Y, Kojima, S, Ikenouchi, T, Nagai, T, Abe, Y, Inoue, H, Morace, A, Utsugi, M, Kato, R, Nishimura, H, Nakai, M, Shiraga, H, Fujioka, S, Azechi, H
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ACCURACY
BREMSSTRAHLUNG
BUBBLE DOSEMETERS
COMPUTERIZED SIMULATION
ELECTRONS
ENERGY SPECTRA
HARD X RADIATION
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
LASER RADIATION
LEAD
LINEAR ACCELERATORS
MEV RANGE
MONTE CARLO METHOD
NEUTRONS
PHOTONUCLEAR REACTIONS
PLASMA
QUANTUM EFFICIENCY
RESOLUTION
X-RAY SPECTROMETERS
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Summary:A photonuclear-reaction-based hard x-ray spectrometer is developed to measure the number and energy spectrum of fast electrons generated by interactions between plasma and intense laser light. In this spectrometer, x-rays are converted to neutrons through photonuclear reactions, and the neutrons are counted with a bubble detector that is insensitive to x-rays. The spectrometer consists of a bundle of hard x-ray detectors that respond to different photon-energy ranges. Proof-of-principle experiment was performed on a linear accelerator facility. A quasi-monoenergetic electron bunch (Ne = 1.0 × 10(-6) C, Ee = 16 ± 0.32 MeV) was injected into a 5-mm-thick lead plate. Bremsstrahlung x-rays, which emanate from the lead plate, were measured with the spectrometer. The measured spectral shape and intensity agree fairly well with those computed with a Monte Carlo simulation code. The result shows that high-energy x-rays can be measured absolutely with a photon-counting accuracy of 50%-70% in the energy range from 2 MeV to 20 MeV with a spectral resolution (Δhν/hν) of about 15%. Quantum efficiency of this spectrometer was designed to be 10(-7), 10(-4), 10(-5), respectively, for 2-10, 11-15, and 15-25 MeV of photon energy ranges.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4893943