{"created":"2023-07-27T06:50:06.324814+00:00","id":42585,"links":{},"metadata":{"_buckets":{"deposit":"fabea22a-e853-466f-ba82-5f25e77cbb7a"},"_deposit":{"created_by":18,"id":"42585","owners":[18],"pid":{"revision_id":0,"type":"depid","value":"42585"},"status":"published"},"_oai":{"id":"oai:kanazawa-u.repo.nii.ac.jp:00042585","sets":["2812:2813:2833"]},"author_link":["17600","67973"],"item_10007_biblio_info_24":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicPageStart":"41p.","bibliographicVolumeNumber":"1999-2000","bibliographic_titles":[{"bibliographic_title":"平成12(2000)年度 科学研究費補助金 基盤研究(C) 研究成果報告書"},{"bibliographic_title":"2000 Fiscal Year Final Research Report","bibliographic_titleLang":"en"}]}]},"item_10007_date_8":{"attribute_name":"報告年度","attribute_value_mlt":[{"subitem_date_issued_datetime":"2001-03","subitem_date_issued_type":"Issued"}]},"item_10007_description_13":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"本研究では超短パルス電子ビームを多段自動加速方式により実現し,この方式で二つのビーム長の異なる大強度電子ビームからの電磁波放射を観測した。ビーム長が装置長より長い場合と短い場合の電磁波放射現象の比較検討を行い,短いビームを用いた場合に,超放射の特徴に一致する現象を観測した。\n4段自動加速法方式を用い,ブルームライン型パルス整形線路から射出された,パルス幅10ns,エネルギー550keVの大強度相対論的電子ビームを,パルス幅1ns,エネルギー1.1MeVまで圧縮することに成功した。\nこの超短パルス大強度電子ビームを,一様磁場中に置かれた長さ60cmの円筒導波管中に入射したところ,ビーム速度と電磁波の群速度が一致する条件で,発生周波数の絞られた(17GHz付近)強い電磁波の出力を得た。この周波数は理論的に予想されたものに一致する。一方,装置長より長いビームを用いた場合,多くのモードからの多数の周波数が観測された。装置長(共鳴領域長)を変化させた実験では,いずれの場合も,発生周波数は距離とともに絞られるが,短いビームの場合その傾向が顕著であった。電磁波出力に関しては,いずれの場合も装置長とともに指数関数的に増大する。装置長より短いビームの場合の方が長いビームに比べ,伝搬距離に伴う出力の成長は早く,60cmの伝搬後の出力は短いビームの方が約10倍大きかった。ただし,短いビームの電磁波出力にはある距離で飽和することが観測された。これは,電磁波の再吸収が起こっているものと考えられ,外部磁場を増す等で対処が可能と考えている。粒子シミュレーションコードKARATを用いた結果も,実験結果がビーム長の効果であることを示した。\nこれらの結果は超短パルス大強度電子ビームによるサイクロトロン超放射で期待されるものと一致する。更に,発生電磁波出力への電流依存性等を検証する必要がある。","subitem_description_type":"Abstract"},{"subitem_description":"An ultrashort pulsed high power electron beam with width of 1 ns and energy of 1.1 MeV was obtained from an intense relativistic electron beam with width of 10 ns and energy of 0.55 MeV using 4-stage autoacceleration.\nThe ultrashort pulsed electron beam with width of 1 ns was injected into a cylindrical waveguide immersed in a uniform magnetic field. Intense radiated microwaves with narrow frequency spectrum were observed when the group velocity of the electromagnetic wave coincided with the beam electron velocity, while, the microwave spectrum with the beam with width of 10 ns showed many surplus peaks. The particle simulation code KARAT also indicated that the beam width affected the radiation spectrum.\nThe length of the drift tubes where the beam electrons interacted with the electromagnetic waves was changes. The output power of the radiated microwave increased exponentially with 1 ns and 10 ns beams. The output power of the microwave from 1 ns beam increased more rapidly than that from 10 ns beam. However, that saturated at the length of 40 cm. After 60 cm propagation, the output power from the 1 ns beam was 10 times larger than that from 10 ns beam.\nThese results suggest that the cyclotron superradiance was observed in the experiment. The dependence of the output power on the beam current should be investigated.","subitem_description_type":"Abstract"}]},"item_10007_description_14":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"研究課題/領域番号:11680480, 研究期間(年度):1999-2000","subitem_description_type":"Other"},{"subitem_description":"研究機関: 金沢大学自然科学研究科","subitem_description_type":"Other"},{"subitem_description":"出典：「大強度相対論的電子ビームからのサイクロトロン超放射の実験的検証」研究成果報告書　課題番号11680480\n  (KAKEN：科学研究費助成事業データベース（国立情報学研究所）)\n　　　本文データは著者版報告書より作成\n","subitem_description_type":"Other"}]},"item_10007_description_4":{"attribute_name":"研究代表者ID","attribute_value_mlt":[{"subitem_description":"90143875","subitem_description_type":"Other"}]},"item_10007_description_9":{"attribute_name":"研究課題番号","attribute_value_mlt":[{"subitem_description":"11680480","subitem_description_type":"Other"}]},"item_10007_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.24517/00048940","subitem_identifier_reg_type":"JaLC"}]},"item_10007_relation_17":{"attribute_name":"関連サイト","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_text":"https://kaken.nii.ac.jp/search/?qm=90143875"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/search/?qm=90143875","subitem_relation_type_select":"URI"}},{"subitem_relation_name":[{"subitem_relation_name_text":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11680480/"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11680480/","subitem_relation_type_select":"URI"}},{"subitem_relation_name":[{"subitem_relation_name_text":"https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-11680480/116804802000kenkyu_seika_hokoku_gaiyo/"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-11680480/116804802000kenkyu_seika_hokoku_gaiyo/","subitem_relation_type_select":"URI"}}]},"item_10007_version_type_20":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_ab4af688f83e57aa","subitem_version_type":"AM"}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-11-16"}],"displaytype":"detail","filename":"SC-PR-KAMADA-K-kaken 2001-41p.pdf","filesize":[{"value":"1.8 MB"}],"format":"application/pdf","licensetype":"license_11","mimetype":"application/pdf","url":{"label":"SC-PR-KAMADA-K-kaken 2001-41p.pdf","url":"https://kanazawa-u.repo.nii.ac.jp/record/42585/files/SC-PR-KAMADA-K-kaken 2001-41p.pdf"},"version_id":"00c1d39f-704c-4b54-9a8d-469ea3fa5416"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"大強度相対論的電子ビーム","subitem_subject_scheme":"Other"},{"subitem_subject":"超放射","subitem_subject_scheme":"Other"},{"subitem_subject":"電子サイクロトロンメーザー","subitem_subject_scheme":"Other"},{"subitem_subject":"大強度電磁波源","subitem_subject_scheme":"Other"},{"subitem_subject":"自動加速","subitem_subject_scheme":"Other"},{"subitem_subject":"intense relativistic electron beam","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"autoacceleration","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"superradiance","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"high-power millimeter wave source","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"electron cyclotron maser","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_researcher":{"attribute_name":"研究代表者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"鎌田, 啓一"}],"nameIdentifiers":[{"nameIdentifier":"67973","nameIdentifierScheme":"WEKO"},{"nameIdentifier":"90143875","nameIdentifierScheme":"e-Rad","nameIdentifierURI":"https://kaken.nii.ac.jp/ja/search/?qm=90143875"}]},{"creatorNames":[{"creatorName":"Kamada, Keiichi"}],"nameIdentifiers":[{"nameIdentifier":"17600","nameIdentifierScheme":"WEKO"},{"nameIdentifier":"90143875","nameIdentifierScheme":"e-Rad","nameIdentifierURI":"https://kaken.nii.ac.jp/ja/search/?qm=90143875"}]}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"research report","resourceuri":"http://purl.org/coar/resource_type/c_18ws"}]},"item_title":"大強度相対論的電子ビームからのサイクロトロン超放射の実験的検証","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"大強度相対論的電子ビームからのサイクロトロン超放射の実験的検証"},{"subitem_title":"Experimental Observation of Cyclotron Superradiance from an Intense Relativistic Electron Beam","subitem_title_language":"en"}]},"item_type_id":"10007","owner":"18","path":["2833"],"pubdate":{"attribute_name":"公開日","attribute_value":"2017-11-16"},"publish_date":"2017-11-16","publish_status":"0","recid":"42585","relation_version_is_last":true,"title":["大強度相対論的電子ビームからのサイクロトロン超放射の実験的検証"],"weko_creator_id":"18","weko_shared_id":-1},"updated":"2023-07-27T14:45:50.226806+00:00"}