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Liu, C.-Y.

Paper Title Page
TUPC128 Air Temperature Analysis and Control Improvement for the EPU 5.6 at TLS 1368
 
  • J.-C. Chang, Y.-C. Chung, C.-Y. Liu, Z.-D. Tsai
    NSRRC, Hsinchu
 
  This paper presents the air temperature analysis and control improvement for area of the elliptically polarizing undulator EPU 5.6 in the Taiwan Light Source (TLS). To enhance uniformity of ambient air temperature, we applied mini environmental controls and installed five cross flow fans in this area. Eight temperature sensors were installed around the EPU to monitor temperature variation. We also simulated the flow field and temperature distribution in this area by using a computational fluid dynamics (CFD) code. The simulation results were validated by comparing to measured data. The temperature variation along time and spatial temperature differences were controlled within 0.1 degree C and 0.5 degree C, respectively.  
THPP125 Performance Evaluation of the Switching Mode AC Power Supply 3652
 
  • C.-Y. Liu, Y.-C. Chien, H. M. Shih
    NSRRC, Hsinchu
 
  In order to improve the injection efficiency, the output current waveform of the AC power supplies must be great. Therefore, to ensure smooth and efficient injection of the booster ring, the phase jitter of the AC power supplies current must be less than ±4ns. A new AC power supply is constructed and employ IGBT modules operating at higher switching frequency than the old GTO-based system for the dipole magnet. This new power supply will not only improve the phase jitter but also increase the operating efficiency than the old power supply. The measured dynamic range of the of the 10 Hz sine wave current output is better than 75dB and phase jitter is less than ±4ns. The improved performance evaluation is illustrated in the paper.