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A broadband gamma-ray spectrometry using novel unfolding algorithms for characterization of laser wakefield-generated betatron radiation

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Title
A broadband gamma-ray spectrometry using novel unfolding algorithms for characterization of laser wakefield-generated betatron radiation
Author(s)
Jong Ho Jeon; Kazuhisa Nakajima; Hyung Taek Kim; Yong Joo Rhee; Vishwa Bandhu Pathak; Myung Hoon Cho; Jung Hun Shin; Byung Ju Yoo; Calin Hojbota; Jo, SH; Kang Woo Shin; Jae Hee Sung; Seung Ku Lee; Byeoung Ick Cho; Il Woo Choi; Chang Hee Nam
Publication Date
2015-12
Journal
REVIEW OF SCIENTIFIC INSTRUMENTS, v.86, no.12, pp.123116 -
Publisher
AMER INST PHYSICS
Abstract
We present a high-flux, broadband gamma-ray spectrometry capable of characterizing the betatron radiation spectrum over the photon energy range from 10 keV to 20 MeV with respect to the peak photon energy, spectral bandwidth, and unique discrimination from background radiations, using a differential filtering spectrometer and the unfolding procedure based on the Monte Carlo code GEANT4. These properties are experimentally verified by measuring betatron radiation from a cm-scale laser wakefield accelerator (LWFA) driven by a 1-PW laser, using a differential filtering spectrometer consisting of a 15-filter and image plate stack. The gamma-ray spectra were derived by unfolding the photostimulated luminescence (PSL) values recorded on the image plates, using the spectrometer response matrix modeled with the Monte Carlo code GEANT4. The accuracy of unfolded betatron radiation spectra was assessed by unfolding the test PSL data simulated with GEANT4, showing an ambiguity of less than 20% and clear discrimination from the background radiation with less than 10%. The spectral analysis of betatron radiation from laser wakefield-accelerated electron beams with energies up to 3 GeV revealed radiation spectra characterized by synchrotron radiation with the critical photon energy up to 7 MeV. The gamma-ray spectrometer and unfolding method presented here facilitate an in-depth understanding of betatron radiation from LWFA process and a novel radiation source of high-quality photon beams in the MeV regime. (C) 2015 AIP Publishing LLC
URI
https://pr.ibs.re.kr/handle/8788114/2400
ISSN
0034-6748
Appears in Collections:
Center for Relativistic Laser Science(초강력 레이저과학 연구단) > Journal Papers (저널논문)
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