| 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. | |
| WEP51 | Some fabrication issues on the spare high power input coupler for BEPCII superconductor cavities | 609 |
| | - T. M. Huang, Q. Ma, W. M. Pan, G. W. Wang
IHEP, CAS
| |
| | The BEPCII storage ring adopted two 500MHz
superconducting cavities (SCC). The input coupler for the
SCC is required to feed high RF power up to 150kW
under continuous wave mode (CW). Considering the high
power feeding and the compact structure of the coupler,
the input coupler fabrication is challenged. Up to now,
two units including windows and inner conductor
(antennas) have been made by IHEP for the spare parts of
BEPCII SCC input couplers. Some fabrication issues will
be presented in this paper. | |