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Photonuclear reaction based high-energy x-ray spectrometer to cover from 2 MeV to 20 MeV.
- Source :
- Review of Scientific Instruments; 2014, Vol. 85 Issue 11, p1-3, 3p, 1 Diagram, 1 Chart, 2 Graphs
- Publication Year :
- 2014
-
Abstract
- 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 (N<subscript>e</subscript> = 1.0 x 10<superscript>-6</superscript> C, E<subscript>e</subscript> = 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<superscript>-7</superscript>, 10<superscript>-4</superscript>, 10<superscript>-5</superscript>, respectively, for 2-10, 11-15, and 15-25 MeV of photon energy ranges. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00346748
- Volume :
- 85
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- Review of Scientific Instruments
- Publication Type :
- Academic Journal
- Accession number :
- 99683144
- Full Text :
- https://doi.org/10.1063/1.4893943