{"created":"2023-05-15T14:58:26.347830+00:00","id":79283,"links":{},"metadata":{"_buckets":{"deposit":"42dab99a-94e8-42f2-8f7e-9d4dc2473863"},"_deposit":{"created_by":1,"id":"79283","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"79283"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00079283","sets":["10:29"]},"author_link":["857985","857988","857982","857981","857979","857987","857983","857980","857986","857984"],"item_10005_date_7":{"attribute_name":"発表年月日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2020-01-08","subitem_date_issued_type":"Issued"}]},"item_10005_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"JT-60SA is a fully superconducting tokamak, which uses magnetic field to confine hot plasma in the shape of a torus. JT-60SA magnet system is composed of 18 Toroidal Field coils, 4 Central Solenoid modules and 6 Equilibrium Field coils. These coils need to be cooled by forced flow supercritical pressure helium at 4.5 K. The thermal shields surrounding the coils have to be provided with pressurized helium at 80 K. High temperature superconducting current leads require helium gas at 50 K. Cryopump panels in the plasma vacuum vessels need to be kept at 3.7 K for hydrogen and helium adsorption. The equivalent refrigeration capacity of the helium refrigerator system is about 9 kW at 4.5 K. The nominal compressor flow of 672 g/s is compressed from 0.1 MPa to 1.45 MPa by 8 screw compressors running in parallel. Liquid Nitrogen is used for pre-cooling from 300 K to 80 K. Two turbines in series are operated at about 10 K. Part of flow is expanded in third turbine to supply supercritical pressure helium at 5 K. In order to manage the 12 kW heat pulse from the coils by plasma operations, 7000 liter liquid helium bath is equipped as a thermal damper. The manufacture and installation of the helium refrigerator system were conducted in 2015. The commissioning was finished in October 2016. Performance tests after the commissioning were conducted annually, in order to debug the system and train operators before the first plasma campaign of JT-60SA. During these performance tests, automatic cool-down and warm-up, automatic purification, the total cooling capacity, and stable operation in several operation modes were demonstrated. In this presentation, we represents the summarized result of these performance tests.","subitem_description_type":"Abstract"}]},"item_10005_description_6":{"attribute_name":"会議概要（会議名, 開催地, 会期, 主催者等）","attribute_value_mlt":[{"subitem_description":"10th Asian Conference on Applied Superconductivity and Cryogenics (ACASC), 2nd International Cryogenic Materials Conference in Asia (Asian-ICMC), and the CSSJ meeting","subitem_description_type":"Other"}]},"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":"Natsume, Kyohei"}],"nameIdentifiers":[{"nameIdentifier":"857979","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Otsu, Kiichi"}],"nameIdentifiers":[{"nameIdentifier":"857980","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Kawano, Katsumi"}],"nameIdentifiers":[{"nameIdentifier":"857981","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Fukui, Kazuma"}],"nameIdentifiers":[{"nameIdentifier":"857982","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Hamada, Kazuya"}],"nameIdentifiers":[{"nameIdentifier":"857983","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Natsume, Kyohei","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"857984","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Otsu, Kiichi","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"857985","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Kawano, Katsumi","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"857986","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Fukui, Kazuma","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"857987","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Hamada, Kazuya","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"857988","nameIdentifierScheme":"WEKO"}]}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"conference object","resourceuri":"http://purl.org/coar/resource_type/c_c94f"}]},"item_title":"Performance tests of JT-60SA Helium Refrigerator System","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Performance tests of JT-60SA Helium Refrigerator System"}]},"item_type_id":"10005","owner":"1","path":["29"],"pubdate":{"attribute_name":"公開日","attribute_value":"2019-10-18"},"publish_date":"2019-10-18","publish_status":"0","recid":"79283","relation_version_is_last":true,"title":["Performance tests of JT-60SA Helium Refrigerator System"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-15T22:16:11.567048+00:00"}