{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,13]],"date-time":"2026-03-13T16:46:41Z","timestamp":1773420401378,"version":"3.50.1"},"reference-count":33,"publisher":"AIP Publishing","issue":"9","funder":[{"name":"NIFS Collaboration Research Program","award":["KOAH037"],"award-info":[{"award-number":["KOAH037"]}]},{"name":"NINS Program of Promoting Research"},{"name":"Networking Among Institutions","award":["01411702"],"award-info":[{"award-number":["01411702"]}]},{"name":"Thailand Science and Research and Innovative","award":["2589646"],"award-info":[{"award-number":["2589646"]}]},{"name":"NSRF Via the Program Management Unit for Human Resources and Institutional Development, Research and Innovation","award":["B05F640224"],"award-info":[{"award-number":["B05F640224"]}]}],"content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2022,9,1]]},"abstract":"<jats:p>The perpendicular line-of-sight compact neutron emission spectrometer (perpendicular CNES) was newly installed to understand the helically trapped fast-ion behavior through deuterium\u2013deuterium (D\u2013D) neutron energy spectrum measurement in the Large Helical Device (LHD). The energy calibration of the EJ-301 liquid scintillation detector system for perpendicular CNES was performed on an accelerator-based D\u2013D neutron source. We installed two EJ-301 liquid scintillation detectors, which view the LHD plasma vertically from the lower side through the multichannel collimator. The D\u2013D neutron energy spectrum was measured in a deuterium perpendicular-neutral-beam-heated deuterium plasma. By the derivative unfolding technique, it was found that the D\u2013D neutron energy spectrum had a double-humped shape with peaks at \u223c2.33 and \u223c2.65\u00a0MeV. D\u2013D neutron energy spectrum was calculated based on the fast ion distribution function using guiding center orbit-following models considering the detector\u2019s energy resolution. The calculated peak energies in the D\u2013D neutron energy spectrum almost match the experiment. In addition, a feasibility study toward the measurement of the energy distribution of ion-cyclotron-range-of-frequency-wave-accelerated beam ions was performed.<\/jats:p>","DOI":"10.1063\/5.0100494","type":"journal-article","created":{"date-parts":[[2022,9,12]],"date-time":"2022-09-12T12:32:49Z","timestamp":1662985969000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":10,"title":["Initial operation of perpendicular line-of-sight compact neutron emission spectrometer in the large helical device"],"prefix":"10.1063","volume":"93","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0160-0468","authenticated-orcid":false,"given":"S.","family":"Sangaroon","sequence":"first","affiliation":[{"name":"Energy Research Unit, Department of Physics, Faculty of Science, Mahasarakham University 1 , Maha Sarakham 44150, Thailand"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4555-1837","authenticated-orcid":false,"given":"K.","family":"Ogawa","sequence":"additional","affiliation":[{"name":"National Institute for Fusion Science, National Institutes of Natural Sciences 2 , Toki 509-5292, Japan"},{"name":"The Graduate University for Advanced Studies, SOKENDAI 3 , Toki 509-5292, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3572-1882","authenticated-orcid":false,"given":"M.","family":"Isobe","sequence":"additional","affiliation":[{"name":"National Institute for Fusion Science, National Institutes of Natural Sciences 2 , Toki 509-5292, Japan"},{"name":"The Graduate University for Advanced Studies, SOKENDAI 3 , Toki 509-5292, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"317","published-online":{"date-parts":[[2022,9,12]]},"reference":[{"key":"2023081102213798700_c1","doi-asserted-by":"publisher","first-page":"S264","DOI":"10.1088\/0029-5515\/47\/6\/s05","volume":"47","year":"2007","journal-title":"Nucl. 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