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Suppression of Accelerated Electrons in a High-current Large Negative Ion Source
http://hdl.handle.net/10655/2442
http://hdl.handle.net/10655/24429e98704f-5e0a-440a-99a1-ecf0b8905c1d
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 | Suppression of Accelerated Electrons in a High-current Large Negative Ion Source | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | negative ion source | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | negative-ion-based NBI | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | accelerated electron suppression | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | secondary electron leakage | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | grid aperture shaping | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | grid thermal load | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | acceleration efficiency | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | stripping loss | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | cesium seeding | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | long pulse operation | |||||
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 |
"Takeiri, Y.
× "Takeiri, Y.× Oka, Y.× Osakabe, M.× Tsumori, K.× Kaneko, O.× Takanashi, T.× Asano, E.× Kawamoto, T.× Akiyama, R.× Kuroda, T." |
|||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | "Accelerated electrons, which would lead to high thermal load of grids, have been suppressed in a high-current large hydrogen negative ion source. An aperture of the extraction grid is shaped as the secondary electrons generated on the grid aperture surface would be shielded against the acceleration electric field. The shaped aperture extraction grid works well to prevent the secondary electrons from leaking to the acceleration gap, compared with a straight aperture extraction grid. Although the strong magnetic field at the extraction grid also lowers the electron leakage downstream, the aperture shaping of the extraction grid is more effective for the suppression of the accelerated electrons. The acceleration efficiency, defined by the ratio of the negative ion current to the acceleration drain current, is improved to around 85 %. There remains the accelerated electrons generated in the negative ion neutralization by collision with the residual neutral molecules during the acceleration. The direct interception of the accelerated negative ions with the downstream grid is small. The reduction of the operational gas pressure is quite important to achieve the further improvement of the acceleration efficiency." | |||||
書誌情報 |
en : Research Report NIFS-Series 発行日 1996-12-01 |
|||||
報告書番号 | ||||||
NIFS-467 | ||||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0915-633X |