{"created":"2023-05-15T15:01:19.409551+00:00","id":83192,"links":{},"metadata":{"_buckets":{"deposit":"604d755a-e7d1-45fc-b5cf-1df8f62b8eb9"},"_deposit":{"created_by":1,"id":"83192","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"83192"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00083192","sets":["2"]},"author_link":["997247","997246","997251","997250","997252","997248","997249"],"item_10003_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2021-05","bibliographicIssueDateType":"Issued"},"bibliographic_titles":[{"bibliographic_title":"Proceedings of the 28th IAEA Fusion Energy Conference (FEC2020)"}]}]},"item_10003_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Avoidance of Runaway Electrons (REs) – one of the main objectives of the ITER Disruption Mitigation System (DMS) – may require rising the electron density by a factor 20-40 or more. The present baseline has assumed the assimilation of a small quantity of neon and a large quantity of hydrogen by means of Shattered Pellet Injection (SPI). This paper presents numerical modelling of SPI assimilation using the 1.5D disruption simulator INDEX. In order to identify a pre-thermal quench (pre-TQ) SPI scheme that maximises the electron density, a comparison has been made between the injection of pure hydrogen pellets and that of neon mixed hydrogen pellets (composite pellets). High velocity injection (> 500 m/s) and relatively large shard sizes of the composite pellets can decouple the penetration of pellet shards from that of the radiative cold front, allowing direct core fuelling by pellet ablation before TQ. Otherwise, pre-emptive injection of pure hydrogen pellets is more efficient to raise the electron density. The amount of material that can be assimilated strongly depends on the thermal energy of the target plasma. Concerning the hydrogen L-mode plasma in the non-nuclear operation, the stored energy available for ionizing and ablating the injected material is insufficient to avoid the avalanche growth at the maximum plasma current. Two-step (staggered) injection – hydrogen SPI followed by neon/neon-mixed SPI – is then considered as a promising scheme for RE avoidance by slowing down the hot-tail seed electrons with moderate dilution cooling. The full spec 15 MA DT H-mode operation is more favourable to raise the density with SPI. However, open questions remain regarding the energy balance after TQ to maintain low E/Ec with massive deuterium deposition, and difficulties may arise if one loses the H-mode.","subitem_description_type":"Abstract"}]},"item_10003_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"International Atomic Energy Agency, Vienna"}]},"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":"Akinobu, Matsuyama"}],"nameIdentifiers":[{"nameIdentifier":"997246","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Nardon, Eric"}],"nameIdentifiers":[{"nameIdentifier":"997247","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Honda, Mitsuru"}],"nameIdentifiers":[{"nameIdentifier":"997248","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Takashi, Shiroto"}],"nameIdentifiers":[{"nameIdentifier":"997249","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Lehnen, Michael"}],"nameIdentifiers":[{"nameIdentifier":"997250","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Akinobu, Matsuyama","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"997251","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Takashi, Shiroto","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"997252","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 paper","resourceuri":"http://purl.org/coar/resource_type/c_5794"}]},"item_title":"Requirements for Runaway Electron Avoidance in ITER Disruption Mitigation Scenario by Shattered Pellet Injection","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Requirements for Runaway Electron Avoidance in ITER Disruption Mitigation Scenario by Shattered Pellet Injection"}]},"item_type_id":"10003","owner":"1","path":["2"],"pubdate":{"attribute_name":"公開日","attribute_value":"2021-08-10"},"publish_date":"2021-08-10","publish_status":"0","recid":"83192","relation_version_is_last":true,"title":["Requirements for Runaway Electron Avoidance in ITER Disruption Mitigation Scenario by Shattered Pellet Injection"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-15T19:54:09.015250+00:00"}