Author: Hsiung, G.-Y.
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THPMY013 Laser-Beam Welding for a TPS Beam-Position Monitor 3679
  • Y.T. Huang, C.-C. Chang, J.-R. Chen, G.-Y. Hsiung, S-N. Hsu
    NSRRC, Hsinchu, Taiwan
  The TPS beam-position monitor has two feedthroughs in one flange structure. The hermetic seal was formed with laser-beam welding (LBW). Nd-YAG LBW was adopted to weld a button electrode with a feedthrough; CO2 LBW served for a feedthrough and a flange, Fig. 1. A robotic arm was used for Nd-YAG LBW so that it could accomplish the complicated geometry of the welded joint. Although the CO2 laser was not coordinated with a robotic arm, fixtures were made to implement a circular welded joint the same as welding the feedthrough into a flange. For not only Nd-YAG but also CO2 LBW, the cover gas is the major key that avoids oxidation from atmospheric oxygen and maintains shiny weld beads. Taguchi methods were exploited to find the appropriate parameters for the Nd-YAG pulsed laser, for instance, the laser power, pulse-filling time, frequency etc.. This paper presents the process and details of laser-beam welding of two types for a beam-position monitor.
Laser beam weld, Nd-YAG, CO2, POWER, filling time, beam position monitor
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMY013  
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THPMY015 Measurement of the Pressure in the TPS Booster Ring 3685
  • C.M. Cheng, C.K. Chan, G.-Y. Hsiung, Y.T. Huang, I.C. Sheng, L.H. Wu, I.C. Yang
    NSRRC, Hsinchu, Taiwan
  The booster ring of Taiwan Photon Source (TPS) is designed to provide full energy injection 3 GeV ramped up from 150 MeV with a small beam emittance. It is a synchrotron accelerator of circumference 496.8 m. The vacuum chamber through the magnets is made of thin stainless-steel tube extruded to an elliptical cross section of inner diameters 35 mm and 20 mm, and thickness 0.7 mm. The other chambers have standard 35CF round tube. The vacuum system was baked in the first installation. Because the residual stress of the stainless-steel elliptical tubing caused the magnetic field to become unstable, all elliptical tubing was removed for annealing to proceed, and reinstalled without baking. The ultimate pressure and data for the residual gas are shown as follows.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMY015  
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