| Title |
Numerical and Experimental Study of H⁻ Beam Dynamics in J-PARC LEBT |
| Authors |
- T. Shibata, K. Ikegami, Y. Liu, K. Ohkoshi, M. Otani
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
- A. Miura, H. Oguri, K. Shinto
JAEA/J-PARC, Tokai-mura, Japan
- F. Naito, K. Nanmo, A. Takagi
KEK, Tokai, Ibaraki, Japan
|
| Abstract |
Negative hydrogen ion (H⁻) beam dynamics in J-PARC Low Energy Beam Transport (LEBT) has been investigated by numerical modeling which calculates particle transport with effect of space charge and collision processes. Understandings of H⁻ beam transport in LEBT is important for high transmission rate from Ion Source (IS) to Radio Frequency Quadrupole (RFQ) in J-PARC in higher beam current in future. In 2017, 45 mA beam current of H⁻ has been extracted from IS in J-PARC user operation which has been increased from 30 mA in last 2 years. The beam current is planned to be increased to 50 mA in the next upgrade. As the beam current increase, IS/LEBT commissioning becomes more difficult because of the higher space charge (SC). Especially in J-PARC, vacuum pressure is around 10⁻⁵ Pa by 15 mmf orifice located in the center of LEBT. The orifice prevents residual gas injection from IS to LEBT/RFQ and thus produces stronger SC effect. In the presentation, numerical results are compared with actual results from J-PARC Linac beam commissioning. A comparison of the results shows that location of the 15 mmf orifice results in two peaks of RFQ transmission rate against SOL currents.
|
| Paper |
download TUPO079.PDF [1.009 MB / 3 pages] |
| Slides |
download TUPO079_TALK.PDF [0.968 MB] |
| Poster |
download TUPO079_POSTER.PDF [1.699 MB] |
| Export |
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| Conference |
LINAC2018 |
| Series |
Linear Accelerator Conference (29th) |
| Location |
Beijing, China |
| Date |
16-21 September 2018 |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editorial Board |
Guoxi Pei (IHEP, Beijing, China); Volker RW Schaa (GSI, Darmstadt, Germany); Yong Ho Chin (KEK, Tsukuba, Japan); Shinian Fu (IHEP, Beijing, China); Ning Zhao (IHEP, Beijing, China) |
| Online ISBN |
978-3-95450-194-6 |
| Online ISSN |
2226-0366 |
| Received |
12 September 2018 |
| Accepted |
20 September 2018 |
| Issue Date |
18 January 2019 |
| DOI |
doi:10.18429/JACoW-LINAC2018-TUPO079 |
| Copyright |
 Published by JACoW Publishing under the terms of the Creative Commons Attribution 3.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI. |
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