{"created":"2023-05-15T14:40:03.745728+00:00","id":54977,"links":{},"metadata":{"_buckets":{"deposit":"c51c1b87-c058-41e0-9318-49deb682c120"},"_deposit":{"created_by":1,"id":"54977","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"54977"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00054977","sets":["2"]},"author_link":["562369","562395","562406","562371","562365","562401","562388","562384","562392","562373","562408","562415","562386","562413","562366","562380","562398","562374","562382","562381","562367","562387","562409","562370","562368","562397","562393","562416","562376","562383","562379","562372","562405","562407","562390","562389","562377","562391","562378","562396","562404","562394","562400","562375","562403","562414","562399","562385","562411","562410","562402","562412"],"item_10003_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2016-10","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"8","bibliographicPageStart":"1","bibliographicVolumeNumber":"26","bibliographic_titles":[{"bibliographic_title":"FEC 2016 proceedings"}]}]},"item_10003_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Pulse duration of the ITER-relevant high power density hydrogen negative ion beams at 1 MeV has been successfully extended from 0.4 s to 60 s by using a prototype Multi-Aperture and Multi-Grid accelerator for the ITER and JT-60SA neutral beam systems. This significant progress was achieved based on developments of technology for the design of a voltage holding capability and improvement of a beam optics, which are directly applicable to ITER and JT-60SA. In the design of the voltage holding capability, one of critical remaining issues was a multi-grid effect. This was experimentally investigated by using a multi-grid configuration. The voltage holding capability predicted based on this experimental investigation showed good agreement with experimental results obtained in the JT-60SA negative ion source within 10 % deviation. This result was also applied to improve the beam optics by tuning the acceleration gap. In addition, the extractor configuration was optimized. These tunings significantly contributed to reduce the grid power load from 15 % to 9 % of the total beam acceleration power and to increase the current density up to 1.4 times higher. As the result, 0.97 MeV, 190 A/m2 negative ion beams were generated stably without any breakdowns and any thermal damages on the acceleration grids. This pulse length of the beams with the ITER-relevant energy and current density is the longest one in the world and contributes to assure the 1 MeV accelerator for the ITER NB system.","subitem_description_type":"Abstract"}]},"item_10003_relation_17":{"attribute_name":"関連サイト","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_text":"https://nucleus.iaea.org/sites/fusionportal/Shared%20Documents/FEC%202016/fec2016-preprints/preprint0246.pdf"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://nucleus.iaea.org/sites/fusionportal/Shared%20Documents/FEC%202016/fec2016-preprints/preprint0246.pdf","subitem_relation_type_select":"URI"}}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"metadata only access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_14cb"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"平塚, 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