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- H. Sakai, T. Furuya, N. Nakamura, M. Sato, K. Umemori
KEK, Ibaraki, Japan
- E. Cenni
Sokendai, Ibaraki, Japan
- M. Sawamura
JAEA, Ibaraki-ken, Japan
- K. Shinoe
ISSP/SRL, Chiba, Japan
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We fabricated the prototype of an input coupler, which has two ceramic windows to keep the inside of the superconducting cavity clean, for ERL main linac and performed the high power test. Required input power is about 20kW with standing wave condition for the cavity acceleration field of 20MV/m. In this high power test, the one ceramic window, named as a cold window, was installed into the vacuum insulating chamber and cooled by liquid Nitrogen. First, the multipacting at 10kW level prevented the power increasing. By using the pulse processing method for 8 hours, power finally reached the 25kW with standing wave condition. We could also keep feeding 20kW power into coupler for 16 hours. From these results of high power test, this prototype coupler satisfied our thermal and RF requirements.
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