JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
@inproceedings{ozeki:srf2021-thptev001, author = {K. Ozeki and O. Kamigaito and N. Sakamoto and K. Suda and K. Yamada}, title = {{FPC for RIKEN QWR}}, booktitle = {Proc. SRF'21}, % booktitle = {Proc. 20th International Conference on RF Superconductivity (SRF'21)}, pages = {825--828}, eid = {THPTEV001}, language = {english}, keywords = {vacuum, SRF, Windows, linac, cryomodule}, venue = {East Lansing, MI, USA}, series = {International Conference on RF Superconductivity}, number = {20}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {10}, year = {2022}, issn = {2673-5504}, isbn = {978-3-95450-233-2}, doi = {10.18429/JACoW-SRF2021-THPTEV001}, url = {https://jacow.org/srf2021/papers/thptev001.pdf}, abstract = {{In RIKEN, three cryomodules which contain ten SC-QWRs in total (4 + 4 + 2) were constructed, and beam supply has been started since last year. The FPCs for RIKEN QWR have a disk-type single vacuum window at room-temperature region. A vacuum leakage occurred at one FPC, after 4th cool-down test. In addition, second vacuum leakage occurred at another FPC, after starting beam supply. A dew condensation at air side of vacuum window may degrade the brazing of vacuum window. In order to prevent a dew condensation and to restore damaged FPCs, an additional outer vacuum window using machinable ceramics was designed and attached to the FPCs. In this contribution, a structure of the FPC, troubles, provision for those troubles, and plan for reconstruction are reported.}}, }