{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,28]],"date-time":"2026-02-28T04:53:58Z","timestamp":1772254438046,"version":"3.50.1"},"reference-count":29,"publisher":"AIP Publishing","issue":"12","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2015,12,1]]},"abstract":"<jats:p>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.<\/jats:p>","DOI":"10.1063\/1.4939014","type":"journal-article","created":{"date-parts":[[2015,12,31]],"date-time":"2015-12-31T18:04:57Z","timestamp":1451585097000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":19,"title":["A broadband gamma-ray spectrometry using novel unfolding algorithms for characterization of laser wakefield-generated betatron radiation"],"prefix":"10.1063","volume":"86","author":[{"given":"Jong Ho","family":"Jeon","sequence":"first","affiliation":[{"name":"Institute for Basic Science (IBS) 1 Center for Relativistic Laser Science, , Gwangju 500-712, South Korea"}]},{"given":"Kazuhisa","family":"Nakajima","sequence":"additional","affiliation":[{"name":"Institute for Basic Science (IBS) 1 Center for Relativistic Laser Science, , Gwangju 500-712, South Korea"}]},{"given":"Hyung Taek","family":"Kim","sequence":"additional","affiliation":[{"name":"Institute for Basic Science (IBS) 1 Center for Relativistic Laser Science, , Gwangju 500-712, South Korea"},{"name":"Advanced Photonics Research Institute 2 , GIST, Gwangju 500-712, South Korea"}]},{"given":"Yong Joo","family":"Rhee","sequence":"additional","affiliation":[{"name":"Korea Atomic Energy Research Institute 3 Nuclear Data Center, , Daejeon 305-353, South Korea"}]},{"given":"Vishwa Bandhu","family":"Pathak","sequence":"additional","affiliation":[{"name":"Institute for Basic Science (IBS) 1 Center for Relativistic Laser Science, , Gwangju 500-712, South Korea"}]},{"given":"Myung Hoon","family":"Cho","sequence":"additional","affiliation":[{"name":"Institute for Basic Science (IBS) 1 Center for Relativistic Laser Science, , Gwangju 500-712, South Korea"}]},{"given":"Jung Hun","family":"Shin","sequence":"additional","affiliation":[{"name":"Advanced Photonics Research Institute 2 , GIST, Gwangju 500-712, South Korea"}]},{"given":"Byung Ju","family":"Yoo","sequence":"additional","affiliation":[{"name":"Institute for Basic Science (IBS) 1 Center for Relativistic Laser Science, , Gwangju 500-712, South Korea"}]},{"given":"Calin","family":"Hojbota","sequence":"additional","affiliation":[{"name":"Institute for Basic Science (IBS) 1 Center for Relativistic Laser Science, , Gwangju 500-712, South Korea"},{"name":"GIST 4 Department of Physics and Photon Science, , Gwangju 500-712, South Korea"}]},{"given":"Sung Ha","family":"Jo","sequence":"additional","affiliation":[{"name":"Advanced Photonics Research Institute 2 , GIST, Gwangju 500-712, South Korea"}]},{"given":"Kang Woo","family":"Shin","sequence":"additional","affiliation":[{"name":"Institute for Basic Science (IBS) 1 Center for Relativistic Laser Science, , Gwangju 500-712, South Korea"}]},{"given":"Jae Hee","family":"Sung","sequence":"additional","affiliation":[{"name":"Institute for Basic Science (IBS) 1 Center for Relativistic Laser Science, , Gwangju 500-712, South Korea"},{"name":"Advanced Photonics Research Institute 2 , GIST, Gwangju 500-712, South Korea"}]},{"given":"Seung Ku","family":"Lee","sequence":"additional","affiliation":[{"name":"Institute for Basic Science (IBS) 1 Center for Relativistic Laser Science, , Gwangju 500-712, South Korea"},{"name":"Advanced Photonics Research Institute 2 , GIST, Gwangju 500-712, South Korea"}]},{"given":"Byeoung Ick","family":"Cho","sequence":"additional","affiliation":[{"name":"Institute for Basic Science (IBS) 1 Center for Relativistic Laser Science, , Gwangju 500-712, South Korea"},{"name":"GIST 4 Department of Physics and Photon Science, , Gwangju 500-712, South Korea"}]},{"given":"Il Woo","family":"Choi","sequence":"additional","affiliation":[{"name":"Institute for Basic Science (IBS) 1 Center for Relativistic Laser Science, , Gwangju 500-712, South Korea"},{"name":"Advanced Photonics Research Institute 2 , GIST, Gwangju 500-712, South Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8203-0702","authenticated-orcid":false,"given":"Chang Hee","family":"Nam","sequence":"additional","affiliation":[{"name":"Institute for Basic Science (IBS) 1 Center for Relativistic Laser Science, , Gwangju 500-712, South Korea"},{"name":"GIST 4 Department of Physics and Photon Science, , Gwangju 500-712, South Korea"}]}],"member":"317","published-online":{"date-parts":[[2015,12,31]]},"reference":[{"key":"2023072906271835200_c1","doi-asserted-by":"publisher","first-page":"267","DOI":"10.1103\/PhysRevLett.43.267","volume":"43","year":"1979","journal-title":"Phys. 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