| Title |
Low-Reflection RF Window for ACS Cavity in J-PARC Linac |
| Authors |
- J. Tamura, Y. Kondopresenter, T. Morishita
JAEA/J-PARC, Tokai-mura, Japan
- H. Ao
FRIB, East Lansing, USA
- F. Naito, M. Otani
KEK, Tokai, Ibaraki, Japan
- Y. Nemoto
Nippon Advanced Technology Co., Ltd., Tokai, Japan
|
| Abstract |
In the Japan Proton Accelerator Research Complex (J-PARC) linac, the Annular-ring Coupled Structure (ACS) cavities have been stably operating. To maintain this operation availability, we manufactured three backups of the pillbox-type RF windows for the ACS cavities in fiscal year 2015 and 2017. It is desirable to minimize the RF reflection of the RF window to prevent standing waves from exciting between the cavity and the RF window, and not to significantly change the optimized coupling factor between the cavity and the waveguide. To realize the minimization, the relative permittivities of the ceramic disks of the RF windows were evaluated by measuring the resonant frequencies of the pillbox cavity containing the ceramic disk. On the basis of the evaluated relative permittivities, the pillbox-part lengths of the RF windows were determined. The measured Voltage Standing Wave Ratios (VSWRs) of the manufactured RF windows are just about 1.08 and these are applicable for the practical use.
|
| Paper |
download TUPAL022.PDF [0.856 MB / 3 pages] |
| Export |
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| Conference |
IPAC2018, Vancouver, BC, Canada |
| Series |
International Particle Accelerator Conference (9th) |
| Proceedings |
Link to full IPAC2018 Proccedings |
| Session |
MC4 Poster Session |
| Date |
01-May-18 09:00–12:00 |
| Main Classification |
04 Hadron Accelerators |
| Sub Classification |
A08 Linear Accelerators |
| Keywords |
cavity, Windows, linac, proton, impedance |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editors |
Shane Koscielniak (TRIUMF, Vancouver, BC, Canada); Todd Satogata (JLab, Newport News, VA, USA); Volker RW Schaa (GSI, Darmstadt, Germany); Jana Thomson (TRIUMF, Vancouver, BC, Canada) |
| ISBN |
978-3-95450-184-7 |
| Published |
June 2018 |
| Copyright |
|
