| Autor: |
Mieko Kashiwagi, Takashi Inoue, Masaki Taniguchi, Naotaka Umeda, Larry R. Grisham, Masayuki Dairaku, Jumpei Takemoto, Hiroyuki Tobari, Kazuki Tsuchida, Kazuhiro Watanabe, Haruhiko Yamanaka, Keishi Sakamoto, Yasuhiko Takeiri, Katsuyoshi Tsumori |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings. |
| ISSN: |
0094-243X |
| DOI: |
10.1063/1.3637417 |
| Popis: |
In a five stage multi‐aperture and multi‐grid (MAMuG) accelerator in JAEA, beam acceleration tests are in progress toward 1 MeV, 200 A/m2 H− ion beams for ITER. The 1 MV voltage holding has been successfully demonstrated for 4,000 s with the accelerator of expanded gap length that lowered local electric field concentrations. This led to increase of the beam energy up to 900 keV‐level. However, it was found that beamlets were deflected more in long gaps and direct interceptions of the deflected beamlet caused breakdowns. The beamlet deflection and its compensation methods were studied utilizing a three‐dimensional multi beamlet analysis. The analysis showed that the 1 MeV beam can be compensated by a combination of the aperture offset of 0.8 mm applied in the electron suppression (ESG) and the metal bar called a field shaping plate with a thickness of 1 mm attached beneath the ESG. The paper reports these compensation methods and analytical predictions, with experimental results of the MAMuG accelerator in... |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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