Paper |
Title |
Page |
MOPPR053 |
Improvement of BPM System for the Siam Photon Source |
903 |
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- 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
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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.
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THPPD058 |
Reduction of Conductive EMI Noise Resulted from the Commercial Power Supply |
3644 |
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- C.S. Chen, C.K. Chan, J.-C. Chang, Y.L. Chu, K.H. Hsu, C.Y. Kuo, Y.-H. Liu, C.S. Yang
NSRRC, Hsinchu, Taiwan
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Almost every electronic equipment must be connected to power system. Because of the complexity of power lines, the reduction of conductive electro-magnetic interference (C-EMI) plays an important role in precise measurements. In this paper, a line impedance stabilization network (LISN) was built up to get the spectrum from power lines. After several measurements by some commercial power supplies, it is found that some of these power supplies induce effectively C-EMI into power lines, even if a passive filter is bound in power line. These noises may influence numerous equipments in a local area near the sources. Therefore, how to choose a suitable filter is a decisive factor to reduce the magnitude of C-EMI.
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THPPD059 |
Conductive EMI Reduction to Kicker Magnet Power Supply in NSRRC |
3647 |
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- Y.-H. Liu, J.-C. Chang, C.S. Chen, H.H. Chen, J.-R. Chen
NSRRC, Hsinchu, Taiwan
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The purpose of this paper is to estimate and reduce the conductive Electromagnetic Interference (EMI) from kicker magnet power supply in TLS. A LISN system was conducted to measure the EMI spectrum of kicker power supply. The EMI noise exceeded FCC standards in some frequency range especially during kicker firing. Reducing EMI level by using different EMI filters were applied. Double pi filter was more efficient than single pi filter. After using filter, the conducted EMI could diminish lower than FCC class B. The experimental results will provide useful information to future TPS pulsed magnet design.
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