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A new method to eliminate the error due to the change of out-of-plane entrance angle caused by large plasma current, is successfully applied. One of the key factors is the very homogeneous characteristics of the energy analyzer along the wide slit length. A shaped electrode system, instead of guard rings with a resistor chain, successfully increases the homogeneity of an analyzer. The error due to the significant change of an in-plane entrance angle during a poloidal sweep is carefully minimized and calibrated by a secondary beam ionized by neutral gas introduced in a vacuum vessel. The depth of the measured potential at the plasma center reaches more than 1.5 keV in ohmic plasmas with the ion temperature of 600 eV. 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Measurement of Profiles of the Space Potential in JIPP T-IIU Tokamak Plasmas by Slow Poloidal and Fast Toroidal Sweeps of a Heavy Ion Beam
http://hdl.handle.net/10655/2636
http://hdl.handle.net/10655/2636ffd4bf6a-2416-4814-8b79-905b8c63e3f9
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 | Measurement of Profiles of the Space Potential in JIPP T-IIU Tokamak Plasmas by Slow Poloidal and Fast Toroidal Sweeps of a Heavy Ion Beam | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | HIBP | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | potential | |||||
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 | analyzer | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | beam | |||||
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 |
"Hamada, Y.
× "Hamada, Y.× Nishizawa, A.× Kawasumi, Y.× Narihara, K.× Sato, K.× Seki, T.× Toi, K.× Iguchi, H.× Fujisawa, A.× Adachi, K.× Ejiri, A.× Hidekuma, S.× Hirokura, S.× Ida, K.× Koong, J.× Kawahata, K.× Kojima, M.× Kumazawa, R.× Kuramoto, H.× Liang, R.× Sakakita, H.× Sasao, M.× Sato, K. N.× Tsuzuki, T.× Xu, J.× Yamada, I.× Watari, T.× Negi, I." |
|||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | "By the use of simultaneous fast toroidal and slow poloidal sweeps of a heavy ion beam, plasma potential profiles in JIPP T-IIU tokamak are measured at the rate of 120 spatial profiles per second. A new method to eliminate the error due to the change of out-of-plane entrance angle caused by large plasma current, is successfully applied. One of the key factors is the very homogeneous characteristics of the energy analyzer along the wide slit length. A shaped electrode system, instead of guard rings with a resistor chain, successfully increases the homogeneity of an analyzer. The error due to the significant change of an in-plane entrance angle during a poloidal sweep is carefully minimized and calibrated by a secondary beam ionized by neutral gas introduced in a vacuum vessel. The depth of the measured potential at the plasma center reaches more than 1.5 keV in ohmic plasmas with the ion temperature of 600 eV. In some cases, a rather wide region of positive potential and a sharp decrease of the potential in the center of the plasma are observed." | |||||
書誌情報 |
en : Research Report NIFS-Series 発行日 1994-02-01 |
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報告書番号 | ||||||
NIFS-273 | ||||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0915-633X |