| Paper | Title | Page |
|---|
| TUP09 | High Power Conditioning of the Input Coupler for BEPCII Superconductor Cavity | 122 |
| | - W. M. Pan, G. W. Wang, Y. Sun, Z. Q. Li, H. Y. Lin, B. Xu, Q. Ma, T. M. Huang, P. Sha
IHEP, CAS
| |
| | High power conditioning and RF processing of the
input coupler for BEPCII superconductor cavity (SCC)
has been performed. Gas desorption is very important for
a new input coupler; and high power conditioning and
electron bombardment is quite effective for outgasing.
For this reason, the DC bias voltage is applied to the
conductors of coupler in the room temperature
conditioning. RF power with full reflection of 150kW has
been arrived under +(-)2000V DC bias voltage during the
room temperature conditioning. At the same time, other
methods have also been studied to improve the
performance of input coupler during the beam operation.
Up to now, the input coupler works well under the beam
current of 250mA and beam energy is 2.5Gev, which
means the input coupler can feed 100kW RF power to
beam in continuous wave in normal operation. The details
about the high power conditioning and RF processing of
the input coupler will be given in the paper. | |
| WEP16 | Commissioning of BEPCII superconducting RF system | 477 |
| | - Y. Sun, G. W. Wang, W. M. Pan, Z. Q. Li, Q. Ma, H. Y. Lin, S. P. Li, K. He, Y. P. Liu, H. Huang, B. Xu, Q. Y. Wang, T. M. Huang
IHEP, CAS
| |
| | BEPC single-ring machine had been upgraded to
BEPCII double-ring machine in the past four years, four
199.6MHz RT cavities were replaced by two 499.8MHz
superconducting cavities.
Two SRF stations of BEPCII had passed the first beam
commissioning, physical problems such as changing
frequency from 200MHz to 500MHz and compressing
the bunch length in colliding mode, have been solved
step by step. The engineering problems such as feeding
100KW beam power had also been solved. The SRF
system of BEPCII project had finished on schedule. This
paper gives a brief introduction to the commissioning of
the SRF system of BEPCII. | |
| WEP23 | Fabrication and test of the 500 MHz SC modules for the BEPCII | 503 |
| | - Z. Q. Li, G. W. Wang, W. M. Pan, Y. Sun, S. P. Li, Q. Ma
IHEP, CAS - T. Furuya, S. Mitsunobu, K. Akai, Y. Yamamoto
KEK - Y. Kijima, M. Arakawa, Y. Okada
MELCO, Mitsubishi Electric Co.
| |
| | Two KEKB type HOM damped SC cavities were
constructed during past three years. These SC modules
were re-designed to meet the RF frequency of 500 MHz
of the BEPCII, the upgrade project of the Beijing Electron
and Positron Collider, and have already been operated
smoothly. It is a product of the successful collaboration
among Mitsubishi Electric Co. (MELCO), KEK and
IHEP of China. The cavity modules were fabricated and
surface-treated by MELCO with the help and support of
KEK. The vertical test of niobium cell, and the high
power test of couplers and dampers were carried out in
KEK, and the final acceptance tests were done in IHEP. | |
| WEP44 | The construction of the RF system of BEPC II | 584 |
| | - G. W. Wang, W. M. Pan, Y. Sun, Z. Q. Li, G. Y. Zhao, H. Y. Lin, Y. F. Xu, H. Huang, Q. Ma, B. Xu, Q. Y. Wang, Y. P. Liu, P. Sha, T. M. Huang, R. Liu, R. H. Zeng
IHEP, CAS - T. Furuya, S. Mitsunobu, K. Akai
KEK
| |
| | In this article, we'll introduce the RF system of
BEPCII to readers. It consists of 4 subsystems:
superconducting cavity, high power klystron, cryogenic
system and LLRF. The construction of the RF system had
been finished in late 2006. During the last year of running
till now, it has performed very well. | |
| WEP78 | Design of a 9-cell cavity ILC test cryomodule in CHINA | 692 |
| | - Q. J. Xu, J. Y. Zhai, C. H. Li, Y. Sun, Z. L. Hou, J. Gao
IHEP, CAS - T. X. Zhao, L. Y. Xiong, W. H. Lu, Z. G. Zong, L. Q. Liu, L. Zhang
TIPC, CAS
| |
| | Technical design of a 9-cell cavity cryomodule has
been finished by a collaboration group between IHEP
(Institute of High Energy Physics) and TIPC (Technical
Institute of Physics and Chemistry), which was set up in
last October for the ILC cryomodule related R&D work in
China. The designed Cryomodule is a "test model" for the
ILC cryomodule, and as a component of a
superconducting accelerator test unit which will be built
in the near future. It also can be used for the horizontal
test of a 9-cell cavity. This paper presents the detail
structure, cryogenic flow diagram, thermal and
mechanical simulation of the cryomodule. | |