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The cut-off problem of ECE signals due to the rise in density has been resolved by careful measurements of temperature profile at a high time resolution (Delta t=2ms) during its decay phase. The phenomenon of ultra-fast cooling (so-called pre-cooling) has been identified using the two different methods of ECE and soft X-ray(SXR) measurements. In the outer region (r \u003e r_inv) of the plasma the cooling propagation velocity is comparable to or slightly greater than the pellet velocity, while in the central region (r \u003c r_inv) the propagation velocity is significantly greater than the pellet velocity. Ice pellet were injected into various kinds of JIPP T-IIU plasmas, the current and sawtooth phase of which had different values, including a no-sawtooth plasma. The existence of the sawtooth oscillation and arrival of a pellet near the inversion radius r_inv of the sawtooth oscillations have turned out to be necessary conditions for the pre-cooling, and even just after the sawtooth crash the pre-cooling may start around the q=1 surface, not at the plasma center . Simultaneous measurements of electron temperature and density profiles indicate that the central temperature always decreases before the central density increases. Some anomalous transport might be induced by pellet injection at the central region.\"", "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 2010-02-05T10:20:06Z (GMT). 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Fast Cooling Phenomena with Ice Pellet Injection in the JIPP T-IIU Tokamak
http://hdl.handle.net/10655/3155
http://hdl.handle.net/10655/3155152014ed-44d9-4ce9-868a-61a92806cb7e
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 | Fast Cooling Phenomena with Ice Pellet Injection in the JIPP T-IIU Tokamak | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | JIPP T-IIU tokamak | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | ice pellet injection | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | cooling transport | |||||
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 | q=1 surface | |||||
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 |
"Sakamoto, M.
× "Sakamoto, M.× Sato, K. N.× Ogawa, Y.× Kawahata, K.× Hirokura, S.× Okajima, S.× Adati, K.× Hamada, Y.× Hidekuma, S.× Ida, K.× Kawasumi, Y.× Kojima, M.× Masai, K.× Morita, S.× Takahashi, H.× Taniguchi, Y.× Toi, K.× Tsuzuki, T." |
|||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | "Ice pellet injection experiments were carried out in the JIPP T-IIU tokamak in order to study thermal (cooling) transport just after injection. The cut-off problem of ECE signals due to the rise in density has been resolved by careful measurements of temperature profile at a high time resolution (Delta t=2ms) during its decay phase. The phenomenon of ultra-fast cooling (so-called pre-cooling) has been identified using the two different methods of ECE and soft X-ray(SXR) measurements. In the outer region (r > r_inv) of the plasma the cooling propagation velocity is comparable to or slightly greater than the pellet velocity, while in the central region (r < r_inv) the propagation velocity is significantly greater than the pellet velocity. Ice pellet were injected into various kinds of JIPP T-IIU plasmas, the current and sawtooth phase of which had different values, including a no-sawtooth plasma. The existence of the sawtooth oscillation and arrival of a pellet near the inversion radius r_inv of the sawtooth oscillations have turned out to be necessary conditions for the pre-cooling, and even just after the sawtooth crash the pre-cooling may start around the q=1 surface, not at the plasma center . Simultaneous measurements of electron temperature and density profiles indicate that the central temperature always decreases before the central density increases. Some anomalous transport might be induced by pellet injection at the central region." | |||||
書誌情報 |
en : Research Report NIFS-Series 発行日 1991-10-01 |
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報告書番号 | ||||||
NIFS-116 | ||||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0915-633X |