Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

Experimental Analysis on Temperature Compensation of Capacitive Voltage Divider for a Pulsed High Voltage Measurement

고전압 펄스신호 측정용 분압기의 온도보상에 관한 실험

  • Jang, S.D. (Pohang Accelerator Laboratory, POSTECH) ;
  • Son, Y.G. (Pohang Accelerator Laboratory, POSTECH) ;
  • Kwon, S.J. (Pohang Accelerator Laboratory, POSTECH) ;
  • Oh, J.S. (Pohang Accelerator Laboratory, POSTECH) ;
  • Cho, M.H. (Pohang Accelerator Laboratory, POSTECH)
  • 장성덕 (포항공과대학교 가속기연구소) ;
  • 손윤규 (포항공과대학교 가속기연구소) ;
  • 권세진 (포항공과대학교 가속기연구소) ;
  • 오종석 (포항공과대학교 가속기연구소) ;
  • 조무현 (포항공과대학교 가속기연구소)
  • Published : 2005.07.18
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Abstract

Total 12 units of high power klystron-modulator systems as microwave source is under operation for 2.5-GeV electron linear accelerator in Pohang Light Source(PLS) linac. RF power and beam power of klystron are precisely measured for the effective control of electron beam. A precise measurement and measurement equipment with good response characteristics are required for this. Input power of klystron is calculated from the applied voltage and the current on its cathode. Tiny measurement error severely effects RF output power value of klystron. Therefore, special care is needed to measure precise beam voltage. Capacitive voltage divider(CVD) unit is intended for the measurement of beam voltage of 400 kV generated from the pulsed klystron-modulator system. Main parameter to determine the standard capacitance in the high arm of CVD is dielectric constant of insulation oil. Therefore CVD should be designed to have a minimum capacitance variation due to voltage, frequency and temperature in the measurement range. This paper will discuss the analysis of capacitive voltage divider for a pulsed high-voltage measurement, and the empirical relations between capacitance and oil temperature variation.

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