{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1390011251797886592.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1585/pfr.17.2405087"}},{"identifier":{"@type":"URI","@value":"https://www.jstage.jst.go.jp/article/pfr/17/0/17_2405087/_pdf"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@language":"en","@value":"Effective Decomposition of Water Vapor in Radio-Frequency Plasma with Carbon Deposition on Vessel Wall"}],"dc:language":"en","description":[{"type":"abstract","notation":[{"@language":"en","@value":"<p>In a thermonuclear fusion reactor, a fuel cycle system that recovers and reuses unburnt hydrogen isotopes is indispensable. Oxygen (O) and carbon (C) impurities are chemically combined with the unburnt hydrogen isotopes and exhausted from the plasma vessel of the fusion reactor. The impurities must be decomposed in the fuel cycle system to recover the hydrogen isotopes, especially tritium. In this study, a flow-type reactor using a radio-frequency (RF) plasma was applied to decompose water vapor (H<sub>2</sub>O) molecules. The effect of C deposition on the vessel wall (stainless steel) was confirmed experimentally to promote reactions relating to the decomposition. At RF powers of 30 - 150 W, the decomposition ratio was around 30% with an argon gas mixed with 5% H<sub>2</sub>O at the pressure of 100 Pa (5 Pa for H<sub>2</sub>O) and the flow rate of 20 sccm (1 sccm for H<sub>2</sub>O). The decomposition was enhanced by C depositions on the vessel wall; the decomposition ratio was largely increased to be 75% at the RF power of 150 W. Reasons for the increased ratio may be a reduction of O atoms and molecules and a production of carbon monoxide through the interaction with C depositions. The reduction of O products promoted the decomposition of H<sub>2</sub>O in the plasma because the recombination of O and H can be suppressed.</p>"}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1420001326206654848","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"10804750"},{"@type":"NRID","@value":"1000010804750"},{"@type":"NRID","@value":"9000408953212"},{"@type":"NRID","@value":"9000412276552"}],"foaf:name":[{"@language":"en","@value":"OYA Makoto"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Faculty of Engineering Sciences, Kyushu University"}]},{"@id":"https://cir.nii.ac.jp/crid/1410011251797886721","@type":"Researcher","foaf:name":[{"@language":"en","@value":"IKEDA Ryosuke"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Interdisciplinary Graduate School of Engineering Sciences, Kyushu University"}]},{"@id":"https://cir.nii.ac.jp/crid/1410011251797886592","@type":"Researcher","foaf:name":[{"@language":"en","@value":"KATAYAMA Kazunari"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Faculty of Engineering Sciences, Kyushu University"}]}],"publication":{"publicationIdentifier":[{"@type":"EISSN","@value":"18806821"},{"@type":"LISSN","@value":"18806821"}],"prism:publicationName":[{"@language":"en","@value":"Plasma and Fusion Research"},{"@language":"en","@value":"Plasma and Fusion Research"}],"dc:publisher":[{"@language":"en","@value":"The Japan Society of Plasma Science and Nuclear Fusion Research"},{"@language":"ja","@value":"一般社団法人 プラズマ・核融合学会"}],"prism:publicationDate":"2022-07-08","prism:volume":"17","prism:number":"0","prism:startingPage":"2405087","prism:endingPage":"2405087"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","url":[{"@id":"https://www.jstage.jst.go.jp/article/pfr/17/0/17_2405087/_pdf"}],"availableAt":"2022-07-08","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=fusion%20reactor","dc:title":"fusion reactor"},{"@id":"https://cir.nii.ac.jp/all?q=fuel%20cycle","dc:title":"fuel cycle"},{"@id":"https://cir.nii.ac.jp/all?q=tokamak%20exhaust%20process%20system","dc:title":"tokamak exhaust process system"},{"@id":"https://cir.nii.ac.jp/all?q=hydrogen%20isotope%20recovery","dc:title":"hydrogen isotope recovery"},{"@id":"https://cir.nii.ac.jp/all?q=water%20vapor","dc:title":"water vapor"},{"@id":"https://cir.nii.ac.jp/all?q=plasma%20decomposition","dc:title":"plasma decomposition"},{"@id":"https://cir.nii.ac.jp/all?q=carbon%20deposition","dc:title":"carbon deposition"}],"project":[{"@id":"https://cir.nii.ac.jp/crid/1040850857192563072","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"21K13899"},{"@type":"JGN","@value":"JP21K13899"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21K13899/"}],"notation":[{"@language":"ja","@value":"プラズマを用いたトリチウム化水素化合物ガスの分解によるトリチウム抽出法"},{"@language":"en","@value":"Tritium recovery by plasma decomposition of gaseous tritiated compounds"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360286437446638336","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Tritium fuel cycle in ITER and DEMO: Issues in handling large amount of fuel"}]},{"@id":"https://cir.nii.ac.jp/crid/1360292621123044736","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Plasma 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