| Paper | Title | Page |
|---|
| TUP10 | High Reliable Surface Treatment Recipe of High Gradient Single Cell SRF Cavities at KEK | 125 |
| | - F. Furuta, K. Saito, T. Saeki, H. Inoue, Y. Morozumi, Y. Higashi, T. Higo
KEK
| |
| | We have continued the series tests of single cell
superconducting cavities at KEK. These tests are aimed at
establishing a high yield production of surface treatment
that would reliably allow cavities to reach gradients in
excess of 45 MV/m with high Q in vertical tests. The
cavity shape is all of the KEK Low Loss design. Early
results from this series test demonstrated that reaching
gradients as high as 50 MV/m was feasible. However, the
initial yield was of order 50 %. In order to increase the
yield we have modified our surface preparation followed
an established KEK procedure (KEK-WG5 recipe). We
have succeeded to reach the >95 % yield with gradient of
> 45 MV/m. | |
| WEP45 | The first processing of capacitive-coupling coupler at room temperature in a cryomodule at STF | 587 |
| | - T. Saeki, H. Matsumoto, S. Kazakov, F. Furuta, K. Saito, Y. Higashi, T. Higo, H. Inoue, Y. Morozumi, M. Sato, H. Yamaoka
KEK - J. Hong
PAL - J. Zhai
IHEP, CAS
| |
| | We are constructing Superconducting RF Test Facility
(STF) at KEK for the R&D of ILC accelerator. In the
beginning of year 2007, we installed one TESLA-like 9-
cell cavity and one high-gradient Low-Loss (LL) type 9-
cell cavity into cryomodules at STF. For the LL 9-cell
cavity, an Capacitive-Coupling (CC) input-coupler, a ballscrew
tuner and other peripherals were assembled with
the cavity. The assembled cavity package was installed
with thermal shields and so on into a cryomodule. After
the installation, we performed the first processing of
Capacitive-Coupling (CC) input-coupler in a cryomodule
at the room-temperature. We achieved the power of 250
kW with the pulse-width of 1.5 msec at the repetition rate
of 5 pps. This presentation describes about the assembly
of a CC coupler and a high-gradient LL 9-cell cavity in a
clean room and the processing of the CC coupler at the
room temperature in a cryomodule. | |