{"created":"2023-06-20T15:12:42.202639+00:00","id":9530,"links":{},"metadata":{"_buckets":{"deposit":"51d2aaaf-6e5d-436c-a744-b7fbe4750adc"},"_deposit":{"created_by":3,"id":"9530","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"9530"},"status":"published"},"_oai":{"id":"oai:ynu.repo.nii.ac.jp:00009530","sets":["495:496"]},"author_link":["35036","714","35039","35037","35040","35038"],"item_2_biblio_info_8":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2019-02-28","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"8","bibliographicPageEnd":"083301-21","bibliographicPageStart":"083301-01","bibliographicVolumeNumber":"125","bibliographic_titles":[{"bibliographic_title":"Journal of applied physics"}]}]},"item_2_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"A microplasma thruster of the electrothermal type has been developed with X-band (f = 11 GHz) microwaves and Ar as a propellant. The emphasis was placed on an understanding of distinguished features of the microplasma generation and thrust performance by X-band microwaves, compared with those by S-band (f = 4 GHz) ones. The thruster consisted of a microplasma source 2 mm in the inner diameter and 3–12 mm long with a rod antenna on the axis, followed by a converging-diverging micronozzle. Azimuthally symmetric surface wave-excited plasmas were established by microwaves at powers of ≤6 W, with the source pressure in the range 2–50 kPa at flow rates of 10–70 sccm. The plasma generation, nozzle flow, and thrust performance were numerically analyzed using a two-dimensional fluid model, coupled with an electromagnetic model for microwaves interacting with plasmas in the source region. Simulations indicated that higher frequency f = 11 GHz with the source chamber length Ls ≈ 1/4 of the driving wavelength λ is preferred for the microplasma thruster in terms of efficient plasma generation, gas heating, and thus thrust performance as well as system compactness; moreover, in f = 11 GHz discharges with longer Ls ≈ 3λ/4, standing-wave striation-like plasma structures occur in the axial direction. Experiments were made for f = 11 and 4 GHz microwaves with the respective Ls ≈ λ/4, where the plasma electron density and gas temperature in the microplasma source were measured by optical emission spectroscopy with a small amount of H2 and N2 added. The electron density and gas temperature were in the range of (4–12) × 1019 m−3 and 800–1000 K for f = 11 GHz, being ∼10%–50% higher than those for f = 4 GHz. The thrust performance was also measured by a target-type microthrust stand, giving a thrust, specific impulse, and thrust efficiency in the range 0.2–1.8 mN, 65–90 s, and 2%–14% for f = 11 GHz, which were ∼10%–15% higher than those for f = 4 GHz. These experimental results were consistent with those of simulations, depending on microwave frequency, power, chamber size, and gas flow rate.","subitem_description_type":"Abstract"}]},"item_2_relation_13":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_type":"isIdenticalTo","subitem_relation_type_id":{"subitem_relation_type_id_text":"info:doi/10.1063/1.5054790","subitem_relation_type_select":"DOI"}}]},"item_2_rights_14":{"attribute_name":"権利","attribute_value_mlt":[{"subitem_rights":"©2019 AIP Publishing. "}]},"item_2_source_id_11":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AA00693547","subitem_source_identifier_type":"NCID"}]},"item_2_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"00218979","subitem_source_identifier_type":"ISSN"}]},"item_2_text_4":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"Department of Aeronautics and Astronautics, Graduate School of Engineering, Kyoto University, Present address: Sigma Corporation"},{"subitem_text_value":"Department of Aeronautics and Astronautics, Graduate School of Engineering, Kyoto University, Present address: Mitsubishi Heavy Industries, Ltd., Nagoya Aerospace Systems Works"},{"subitem_text_value":"Department of Aeronautics and Astronautics, Graduate School of Engineering, Kyoto University,  Present address: Hitachi Ltd., Central Research Laboratory"},{"subitem_text_value":"Department of Aeronautics and Astronautics, Graduate School of Engineering, Kyoto University, Present address: Division of Systems Research, Faculty of Engineering, Yokohama National University"},{"subitem_text_value":"Department of Aeronautics and Astronautics, Graduate School of Engineering, Kyoto University"},{"subitem_text_value":"Department of Aeronautics and Astronautics, Graduate School of Engineering, Kyoto University, Joining and Welding Research Institute, Osaka University"}]},"item_2_version_type_18":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Takahashi, Takeshi"}],"nameIdentifiers":[{"nameIdentifier":"35038","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Mori, Daisuke"}],"nameIdentifiers":[{"nameIdentifier":"35036","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Kawanabe, Tetsuo"}],"nameIdentifiers":[{"nameIdentifier":"35037","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Takao, Yoshinori"}],"nameIdentifiers":[{"nameIdentifier":"714","nameIdentifierScheme":"WEKO"},{"nameIdentifier":"80552661","nameIdentifierScheme":"e-Rad","nameIdentifierURI":"https://kaken.nii.ac.jp/ja/search/?qm=80552661"}]},{"creatorNames":[{"creatorName":"Eriguchi, Koji"}],"nameIdentifiers":[{"nameIdentifier":"35039","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Ono, Kouichi"}],"nameIdentifiers":[{"nameIdentifier":"35040","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2019-02-25"}],"displaytype":"detail","filename":"2019.Takahashi,T.JAP.125.083301.pdf","filesize":[{"value":"4.0 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"1.2019.Takahashi,T.JAP.125.083301.pdf","url":"https://ynu.repo.nii.ac.jp/record/9530/files/2019.Takahashi,T.JAP.125.083301.pdf"},"version_id":"a57173ed-dfe8-4987-b784-e8dab434af0f"}]},"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":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"Microplasma thruster powered by X-band microwaves","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Microplasma thruster powered by X-band microwaves"}]},"item_type_id":"2","owner":"3","path":["496"],"pubdate":{"attribute_name":"公開日","attribute_value":"2019-02-25"},"publish_date":"2019-02-25","publish_status":"0","recid":"9530","relation_version_is_last":true,"title":["Microplasma thruster powered by X-band microwaves"],"weko_creator_id":"3","weko_shared_id":3},"updated":"2023-06-20T18:31:29.755256+00:00"}