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Hwang, J.-Y.

Paper Title Page
MOPAN103 New Control System for the 50 MeV Linear Accelerator of TLS 404
  • C. Y. Wu, J. Chen, K. T. Hsu, S. Y. Hsu, J.-Y. Hwang, D. Lee, K.-K. Lin, C.-J. Wang
    NSRRC, Hsinchu
  The preinjector of the Taiwan Light Source(TLS) is consist of a 140 kV themionic gun and a 50 MeV traveling wave type linear accelerator system. In order to improve performance, to decouple the vacuum interlock logic from the linac control system, and to provide a better control functionality for top-up operation and to avoid obsolescence, linac control system have been renew. One VME crate system is dedicated for linac control, new hardware equips with high resolution of analog interface to provide better control. Vacuum interlock logic will be done be a dedicated programmable logic controller(PLC). The remained linac devices have sequential control needed will be done by another PLC, such as door access interlock, klystron warm up, gun warm up, trig interlock, gun high voltage interlock, klystron modulator high voltage interlock, water flow interlock. Both interlock and sequence control PLC will control by the VME crate. All the other functions without interlock or sequence requirement will control by the VME crate directly. New control system expects to provide better control functionality, better performance, easy for maintenance, and useful easy to add new hardware equipments.  
TUPMN073 First Operation of a Thermionic Cathode RF Gun at NSRRC 1088
  • A. P. Lee, S.-S. Chang, J.-Y. Hwang, W. K. Lau, C. C. Liang, G.-H. Luo, T.-T. Yang
    NSRRC, Hsinchu
  An injector system that based on rf gun technology is being constructed at NSRRC. This will be a 100 MeV beam injector that consists of an rf linac with a thermionic cathode rf gun as electron source. The superior performance and special configuration of the thermionic rf gun system made it an attractive option as a reliable pre-injector booster synchrotron. In cooperation with an alpha-magnet as low energy bunch compressor, ultra-fast electron beam pulses as short as 100 fs can be generated from the thermionic cathode rf gun for generation of intense coherent short wavelength radiations, production of femto-second electron and wavelength tunable ultra-fast X-ray pulses. First operation of the thermionic rf gun will be presented.  
TUPMN076 The Fabrication and Characterization of an S-band RF-gun Cavity 1097
  • T.-T. Yang, C.-S. Fann, K. T. Hsu, S. Y. Hsu, J.-Y. Hwang, W. K. Lau, A. P. Lee, C. C. Liang, K.-K. Lin, K.-B. Liu, Y.-C. Liu, H. M. Shih, M.-S. Yeh
    NSRRC, Hsinchu
  A single cell rf-gun cavity is designed and fabricated for the purpose of examining the feasibility of installing a thermionic rf-gun at NSRRC instead of a photocathode rf-gun considered previously. The operating frequency of the rf-gun cavity is set at 2856 MHz in order to utilize the available XK-5 klystron and linac. The fabricated parts of the OFHC copper cavity are brazed together in-house and then the cavity is characterized by rf measurement. It shows that the cavity gives very good character in terms of high quality factor, relaxed tuning range, adequate coupling coefficient, and reasonable reproducibility. The properties of the cavity are further explored by measuring the field profile and its response to an rf pulse in which the filling time is deduced. The measurement results of this brazed cavity are described and summarized in this report.  
FRPMN083 RF Feed-Forward Control Experiments for the 50 MeV Linear Accelerator at TLS 4258
  • K. H. Hu, K. T. Hsu, J.-Y. Hwang, D. Lee, K.-K. Lin, C. Y. Wu
    NSRRC, Hsinchu
  Performance of an electron linear accelerator is very important for synchrotron light source application. Its performance will decide the reproducibility of filling pattern in the booster synchrotron. The filling pattern of the booster synchrotron will affect filling pattern control of the storage ring. The RF feed-forward control can improve performance of linear accelerator deistically. Design consideration and details of the implementation will be summary in this report.