| Tuning of RF amplitude and phase for the drift tube linac in J-PARC |
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| 作者姓名： | 沈国保 Masanori Ikegami |
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| 作者单位： | 1 Japan Atomic Energy Agency JAEA, 2-4 Shirakata-Shirane, Tokai, Ibaraki, 319-1195, Japan;2 High Energy Accelerator Research Organization KEK, 1-1 Oho, Tsukuba, 305-0801, Japan |
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| 基金项目： | This study owes much to the thoughtful and helpful comments of Dr. Akira Ueno of JAEA and Prof. Eiichi Takasaki of KEK. Thanks are due to Dr. Hiroyuki Sako, Dr. Susumu Sato, and Dr. Tetsuya Kobayashi of JAEA for supporting the experiment. Also, special thanks go to Dr. Ji Qiang of LBL for helping us in performing the IMPACT simulation. Finally, the authors would like to thank Prof. Yoshishige Yamazaki of KEK, Dr. Kazuo Hasegawa of JAEA, and Dr. Hiroshi Yoshikawa of JAEA for their continuous encouragement and support. |
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| 摘 要： | The J-PARC linac has three DTL tanks to accelerate the negative hydrogen ions from 3 MeV to 50 MeV. The RF phase and amplitude are adjusted for each cavity with a phase scan method within the accuracy of 1° in phase and 1% in amplitude. The experimental results show a remarkable agreement with the numerical model within a suffcient margin in the tuning of the last two DTL tanks. However,a notable discrepancy between the experiment and the numerical model is seen in the tuning of the first DTL tank. After studying with a three-dimensional multi-particle simulation,the generation of the low energy component and the pronounced filamentation are identified as the main causes of the discrepancy. The optimization of the tuning scheme is also discussed to attain the tuning goal accuracy for the first DTL tank.
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| 关 键 词： | 直线加速器 相位 射频 漂移管 振幅和 阿尔托 优化调整 调谐 |
| 收稿时间： | 2008-9-9 |
| 修稿时间： | 2008-10-31 |
Tuning of RF amplitude and phase for the drift tube linac in J-PARC |
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| Affiliation: | [1]Japan Atomic Energy Agency (JAEA), 2-4 Shirakata-Shirane, Tokai, Ibaraki, 319-1195, Japan; [2]High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, 305-0801, Japan |
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| Abstract: | high-intensity beam, drift tube linac, signature matching, J-PARC |
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| Keywords: | high-intensity beam drift tube linac signature matching J-PARC |
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