Design and Operation of the Dual Return Valves to Stabilize Helium Vessel Pressure of the SRF Module

DOI

10.2991/icemie-16.2016.5How to use a DOI?

Keywords

SRF module; cryogenics; dual valves

Abstract

The Taiwan Photon Source at National Synchrotron Radiation Research Center selects the KEK-B type superconducting radio-frequency (SRF) module to deliver RF energy to the 3-GeV electrons circulated in the storage ring. Each SRF module has its own control valve box to adjust the flow rate of transferring cryogens to SRF module and back to the cryogenic plant. The major dynamic cryogenic load comes from the various quantity of vaporized liquid helium along the transferring path from the liquid helium Dewar to SRF module, whereas the dynamic surface heating by various RF gap voltages is successfully eliminated by a heater compensation unit. To regulate pressure of the liquid helium vessel at high stability, two cryogenic valves of different sizes for the cold return gas are equipped on each control valve box. Both the design and measured performance of the dual return valves are presented herein. Currently the pressure fluctuation can be suppressed to +/- 2 mbar at the nominal operation condition. A venturi-type flow meter on the return line for gaseous helium is used to monitor the static heat load on the liquid helium under various operation conditions. It is aimed to further reduce the pressure fluctuation by optimizing the operating parameters of the controllers for the dual return valves.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Mei-Hsia Chang
AU  - Chaoen Wang
AU  - Ming-Chyuan Lin
AU  - Meng-Shu Yeh
AU  - Chih-Lung Lo
AU  - Ming-Hsun Tsai
AU  - Po-Yuan Chen
AU  - Fu-Tsai Chung
AU  - Ling-Jhen Chen
AU  - Lung-Hai Chang
AU  - Tsung-Chi Yu
AU  - Zong-Kai Liu
AU  - Chi-Lin Tsai
PY  - 2016/04
DA  - 2016/04
TI  - Design and Operation of the Dual Return Valves to Stabilize Helium Vessel Pressure of the SRF Module
BT  - Proceedings of the 2016 International Conference on Electrical, Mechanical and Industrial Engineering
PB  - Atlantis Press
SP  - 17
EP  - 21
SN  - 2352-5401
UR  - https://doi.org/10.2991/icemie-16.2016.5
DO  - 10.2991/icemie-16.2016.5
ID  - Chang2016/04
ER  -