Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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KLYSTRON-MODULATOR SYSTEM PERFORMANCES FOR PLS 2-GeV LINAC

포항 20억 전자볼트 선형가속기 클라이스트론-모듈레이터 시스템의 성능

  • Park, S.W. (Pohang Accelerator Laboratory, POSTECH) ;
  • Park, S.S. (Pohang Accelerator Laboratory, POSTECH) ;
  • Lee, K.T. (Pohang Accelerator Laboratory, POSTECH) ;
  • Oh, J.S. (Pohang Accelerator Laboratory, POSTECH) ;
  • Cho, M.H. (Pohang Accelerator Laboratory, POSTECH) ;
  • NamKung, W. (Pohang Accelerator Laboratory, POSTECH)
  • 박상욱 (포항 가속기 연구소, 포항 공과 대학교) ;
  • 박성수 (포항 가속기 연구소, 포항 공과 대학교) ;
  • 이경태 (포항 가속기 연구소, 포항 공과 대학교) ;
  • 오종석 (포항 가속기 연구소, 포항 공과 대학교) ;
  • 조무현 (포항 가속기 연구소, 포항 공과 대학교) ;
  • 남궁원 (포항 가속기 연구소, 포항 공과 대학교)
  • Published : 1995.07.20
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Abstract

The PLS 2-GeV linac employs 11 units of high-power pulsed klystrons(80MW) as the main RF sources. The matching modulators of 200 MW(400kV, 500 A) can provide a flat-top pulse width of 4.4 ${\mu}s$ with a maximum pulse repetition rate of 120 Hz at the full power level. For a good stability of electron beams, the pulse-to-pulse flat-top voltage variation of a modulator requires less than 0.5%. In order to achieve this goal, we stabilized high voltage charging power supplies within 1% by a phase controlled SCR voltage regulator. In addition, we employed ac/dc feedback together with a resistive De-Q'ing system to achieve far less than 0.5% variation of the PFN charging voltage. This paper presents the main feature of the klystron-modulator system and the characteristics of the pulsed high-power RF system performance during the beam injection operation for the Pohang Light Source commissioning.

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