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The simulation results reveal that the q value, which at first decreases in accordance with current peaking subject to ohmic heating, starts increasing in the q \u003c 1 region due to strong excitation of nonlinear resistive kink modes and tends to be bottom-flattened. When the q profile is largely flattened in the q \u003c 1 region, the dynanlic pressure of the m= 1 kink mode pushes the hot core plasma in the main flow direction and the hot core deviates from the magnetic axis. Then, a strong plasma compression occurs at the stagnation point of the directed plasma flow which is coincident with the m=1 rational surface. Consequently, the poloidal magnetic field lines are driven to reconnect rapidly with each other across the q=1 surface, and the deviated hot core is pushed out towards the wall to destroy its confinement . The driven magnetic reconnection leading to the crash is found to occur as a result of the q-profile flattening, in contrast to Kadomtsev\u0027s model where the q-profile becomes flattened as a result of reconnection exchanging the magnetic flux. The crash is governed by the MHD time scale, about 100 poloidal Alfven transit times, which is much faster than the Kadomtsev reconnection time. The resistive kink mode and its nonlinear behavior control the whole process of the sawtooth osllation. Especially, the m= I plasma flow induced by the resistive kink instability, neither the magnetic force nor the pressure force, plays a decisive role in triggering the crash.\"", "subitem_description_type": "Abstract"}]}, "item_5_source_id_10": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "0915-633X", "subitem_source_identifier_type": "ISSN"}]}, "item_5_text_25": {"attribute_name": "登録情報", "attribute_value_mlt": [{"subitem_text_value": "Made available in DSpace on 2010-02-05T10:19:37Z (GMT). No. of bitstreams: 0\n Previous issue date: 1993-07"}]}, "item_5_text_8": {"attribute_name": "報告書番号", "attribute_value_mlt": [{"subitem_text_value": "NIFS-238"}]}, "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": "\"Watanabe, K.", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "65336", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Sato, T.", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "65337", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Nakayama, Y.\"", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "65338", "nameIdentifierScheme": "WEKO"}]}]}, "item_keyword": {"attribute_name": "キーワード", "attribute_value_mlt": [{"subitem_subject": "tokamak", "subitem_subject_language": "en", "subitem_subject_scheme": "Other"}, {"subitem_subject": "sawtooth oscillation", "subitem_subject_language": "en", "subitem_subject_scheme": "Other"}, {"subitem_subject": "computer simulation", "subitem_subject_language": "en", "subitem_subject_scheme": "Other"}, {"subitem_subject": "magnetohydrodynamics", "subitem_subject_language": "en", "subitem_subject_scheme": "Other"}, {"subitem_subject": "magnetic reconnection", "subitem_subject_language": "en", "subitem_subject_scheme": "Other"}]}, "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": "research report", "resourceuri": "http://purl.org/coar/resource_type/c_18ws"}]}, "item_title": "Q-profile Flattening due to Nonlinear Development of Resistive Kink Mode and Ensuing Fast Crash in Sawtooth Oscillations", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "Q-profile Flattening due to Nonlinear Development of Resistive Kink Mode and Ensuing Fast Crash in Sawtooth Oscillations", "subitem_title_language": "en"}]}, "item_type_id": "5", "owner": "3", "path": ["32"], "permalink_uri": "http://hdl.handle.net/10655/3065", "pubdate": {"attribute_name": "公開日", "attribute_value": "2010-02-05"}, "publish_date": "2010-02-05", "publish_status": "0", "recid": "10394", "relation": {}, "relation_version_is_last": true, "title": ["Q-profile Flattening due to Nonlinear Development of Resistive Kink Mode and Ensuing Fast Crash in Sawtooth Oscillations"], "weko_shared_id": -1}
Q-profile Flattening due to Nonlinear Development of Resistive Kink Mode and Ensuing Fast Crash in Sawtooth Oscillations
http://hdl.handle.net/10655/3065
http://hdl.handle.net/10655/3065db3c9c17-3185-49a1-8341-2b106866b5a2
Item type | 研究報告書 / Research Paper(1) | |||||
---|---|---|---|---|---|---|
公開日 | 2010-02-05 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Q-profile Flattening due to Nonlinear Development of Resistive Kink Mode and Ensuing Fast Crash in Sawtooth Oscillations | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | tokamak | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | sawtooth oscillation | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | computer simulation | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | magnetohydrodynamics | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | magnetic reconnection | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_18ws | |||||
資源タイプ | research report | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
著者 |
"Watanabe, K.
× "Watanabe, K.× Sato, T.× Nakayama, Y." |
|||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | "Presented is a new full-torus, compressible, resistive MHD simulation model that can adequately explain the mechanism of the fast crash in the sawtooth oscillation. The simulation results reveal that the q value, which at first decreases in accordance with current peaking subject to ohmic heating, starts increasing in the q < 1 region due to strong excitation of nonlinear resistive kink modes and tends to be bottom-flattened. When the q profile is largely flattened in the q < 1 region, the dynanlic pressure of the m= 1 kink mode pushes the hot core plasma in the main flow direction and the hot core deviates from the magnetic axis. Then, a strong plasma compression occurs at the stagnation point of the directed plasma flow which is coincident with the m=1 rational surface. Consequently, the poloidal magnetic field lines are driven to reconnect rapidly with each other across the q=1 surface, and the deviated hot core is pushed out towards the wall to destroy its confinement . The driven magnetic reconnection leading to the crash is found to occur as a result of the q-profile flattening, in contrast to Kadomtsev's model where the q-profile becomes flattened as a result of reconnection exchanging the magnetic flux. The crash is governed by the MHD time scale, about 100 poloidal Alfven transit times, which is much faster than the Kadomtsev reconnection time. The resistive kink mode and its nonlinear behavior control the whole process of the sawtooth osllation. Especially, the m= I plasma flow induced by the resistive kink instability, neither the magnetic force nor the pressure force, plays a decisive role in triggering the crash." | |||||
書誌情報 |
en : Research Report NIFS-Series 発行日 1993-07-01 |
|||||
報告書番号 | ||||||
NIFS-238 | ||||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0915-633X |