| 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. | |
| WEP66 | High pressure rinsing system studies | 664 |
| | - D. Sertore, M. Fusetti, P. Michelato, C. Pagani
INFN Milano-LASA - T. Higo, J. Hong, K. Saito
KEK - G. Ciovati, T. Rothgeb
JLab - A. Matheisen, N. Krupka
DESY
| |
| | High pressure rinsing (HPR) is a key process for the
surface preparation of high field superconducting cavities.
HPR water jets used in different laboratories have been
characterized measuring the transferred momentum
between the water jet and a target connected to a load cell.
The information taken during these measurements,
combined with HPR process parameters, allow
calculating new significant measurable variables such as
the jet power, the deposited energy on the cavity surfaces
and the pressure. | |