| 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. | |
| TUP15 | Multipacting Study of ICHIRO End Cavity | 142 |
| | - I. Hwang, E. -S. Kim
CHEP, Kyoungpook National University - J. Hong
POSTECH - Y. Morozumi, K. Saito
KEK
| |
| | High gradient superconducting RF cavity named Ichiro
type in KEK is developing as the Alternatives
Configuration Document for the international linear
collider. Multipacting is one of the most serious
limitations to achieve high gradient. Several simulation
research found out that multipacting at the tapered beam
pipe is too strong. We investigated multipacting effects in
various end cavities with beam tube and compared with
experiments. | |
| 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. | |