Author: Huang, Y.T.
Paper Title Page
WEPVA121 Thermal Experimet Results on TPS Beam Position Monitors 3554
 
  • Y.T. Huang, C.K. Chan, J. -Y. Chuang, I.C. Sheng, Y.C. Yang
    NSRRC, Hsinchu, Taiwan
 
  Beam position monitors mounted in straight sections exhibit an unusual temperature rise which is attributed to poor thermal and electrical conductivity of the stainless steel BPM chamber, to the vicinity to RF-bellows, and the large button electrode size to get superior signal levels. Thermocouples tied to BPM flanges and RF bellows show that the temperature could reach 50 oC when storing a beam current of 400 mA and BPMs located between two RF-bellows in RF cavity sections responds by even 5-10 oC higher values than average. To resolve this issue, off site experiments and simulations were conducted to further understand the heat flow in the whole structure. In this paper we discuss more details of these studies.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA121  
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WEPVA122 Two Year Operational Experience With the Tps Vacuum System 3557
 
  • Y.C. Yang, C.K. Chan, J. -Y. Chuang, Y.T. Huang, C.C. Liang, I.C. Sheng
    NSRRC, Hsinchu, Taiwan
 
  The Taiwan Photon Source (TPS), a 3-GeV third generation synchrotron light source, was commissioned in 2014 December and is now currently operated in top-up mode at 300mA for users. During the past two years, the machine was completed to meet design goals with among others the installation of superconducting cavities (SRF), the installation of insertion devices (ID) and the correction of vacuum chamber structure downstream from the IDs. The design goal of 500mA beam current was achieved with a total accumulated beam dose of more than 1000Ah, resulting in three orders of magnitude reduction of out-gassing. As the beam current was increased, a few vacuum problems were encountered, including vacuum leaks, unexpected pressure bursts, etc. Vacuum related issues including high pressure events, lessons learned and operational experience will be presented and discussed in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA122  
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WEPVA123 Beam Cleaning of the Vacuum System of the TPS Storage Ring without Baking in Situ 3561
 
  • C.K. Chan, C.-C. Chang, B.Y. Chen, C.M. Cheng, Y.T. Cheng, J. -Y. Chuang, Y.M. Hsiao, Y.T. Huang, I.C. Sheng, C. Shueh, L.H. Wu, Y.C. Yang
    NSRRC, Hsinchu, Taiwan
 
  A maintenance procedure without baking in situ has been successfully developed and applied to maintain and upgrade the TPS storage ring vacuum system to shorten the machine downtime. The data of photon-stimulated desorption(PSD) reveal that no obvious discrepancy between the in-situ baked and the non-in-situ baked vacuum systems. A beam conditioning dose of extent only 11.8 A·h is required to recover rapidly the dynamic pressure of an unbaked vacuum system to its pre-intervention value according to the TPS maintenance experience.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA123  
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