Author: Klinkhieo, S.
Paper Title Page
MOPPR053 Improvement of BPM System for the Siam Photon Source 903
  • P. Songsiriritthigul, S. Boonsuya, S. Klinkhieo, P. Klysubun, S. Krainara, P. Sudmuang, N. Suradet
    SLRI, Nakhon Ratchasima, Thailand
  • J.-R. Chen, H.P. Hsueh, Y.-H. Liu
    NSRRC, Hsinchu, Taiwan
  • S. Rujirawat, P. Songsiriritthigul
    Suranaree University of Technology, Nakhon Ratchasima, Thailand
  The Siam Photon Source (SPS) is the first synchrotron light source ever built by modifying and relocating a light source from one country to another. The SPS produced its first light in Dec 2001. The machine has been used to provide regularly synchrotron light for users since 2005. Systematic studies and investigations of the machine have properly been carried out under the supervision of the International Advisory Committee of SLRI in the last two years. This report describes the improvement of the beam position monitoring (BPM) system for the 1.2 GeV storage ring of SPS. The efficiency and reliability of the original BPM system was greatly hindered by the low quality signal cables. The replacement with the higher quality (lower loss and better interference shielding) BPM cables and the implementation of a separated cable tray for the BPM cables have significantly improved the quality of the BPM signals, allowing the possibilities for machine study and thus providing further improvement of the machine. Detailed descriptions of the work on the BPM electronic boards will be described. The measurement results before and after the improvement of the BPM system will also be presented.  
WEPPP067 Commissioning Results of Slow Orbit Feedback using PID Controller Method for the Siam Photon Source 2861
  • S. Klinkhieo, S. Boonsuya, P. Klysubun, S. Krainara, P. Songsiriritthigul, P. Sudmuang, N. Suradet
    SLRI, Nakhon Ratchasima, Thailand
  • S. Rujirawat
    Suranaree University of Technology, Nakhon Ratchasima, Thailand
  A slow orbit feedback (SOFB) system has been developed to improve the orbit stability for the storage ring of the Siam Photon Source (SPS). The SOFB uses a PID controller method utilizing LabVIEW channel to access 20 BPMs and 28 correctors of the storage ring. The first phase implementation of the feedback loops based on this method was operated at 0.05Hz of sampling frequency, which reduce the fluctuation of both horizontal and vertical positions of the orbit from ~200 microns down to ~30 microns. The commissioning results indicate that further work and hardware upgrade are required. A higher sampling frequency at least 30Hz is strongly required for PID controller implementation. Upgrading of the existing 12-bit resolution corrector power supplies is also necessary. The basic principle of PID algorithms, hardware, software and commissioning results of the current SOBF system, as well as a future development plan, will be presented.