| Paper | Title | Page |
|---|
| 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. | |
| WEP19 | Cryogenic system for BEPCII superconducting cavities | 486 |
| | - Y. P. Liu, S. P. Li, K. He, M. J. Sang, R. Ge, C. W. Lv, L. Bian, Z. Zhang
IHEP, CAS
| |
| | In order to improve the luminosity of the Beijing
electron positron collider, two KEKB type 500MHz
superconducting cavities are adopted in the upgrade
project which is named as BEPCII. These two cavities are
installed in e+ and e- ring, respectively. They are cooled
in liquid helium bath contained in a vacuum insulated
vessel. Cryogenic system is designed and constructed to
provide the superconducting operating circumstance for
the cavities. This paper is dedicated to briefly introduce
the BEPCII rf side cryogenic system. | |
| 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. | |
| WEP82 | The measurements of static heat loss and unloaded Q0 on the BEPCII SRF cavities | 708 |
| | - L. Bian, S. P. Li, Y. P. Liu
IHEP, CAS
| |
| | The static heat loss and unloaded Q0 are most
important values for both cryogenic system and RF
system. The BEPCII SRF cavity operates in a liquid
helium bath contained in a vacuum insulated, liquid
nitrogen cooled radiation shielded vessel. During
horizontal test at the test station, thermodynamic method
is used to measure and calculate the static loss and Q0 of
SRF cavity. This paper has briefly introduced the method
and process to measure the static loss and Q0 of the SRF
cavity. Results under different experimental conditions
are also given. These results are also used as important
data for acceptance test of the SRF cavities. | |