Initial-beam-loading compensation system for high-intensity electron linacs

M. Satoh, T. Matsumoto, T. Shidara, S. Fukuda, H. Kobayashi, Y. Kamiya, N. Nakamura, T. Koseki, S. Miura

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


We developed an initial-beam-loading compensation system for electron linacs. This system consists of a ΔΦ-A (phase-to-amplitude) modulator and a fast-phase detector. The ΔΦ-A modulator can modulate the phase and the amplitude of a low-power RF simultaneously. Low-power and high-power tests were successfully carried out at KEK. The result of the high-power tests show that our system can reduce the energy spread from 27 to 0.3% for a 300-mA average current. The system that we developed can be a powerful tool for initial-beam-loading compensation. In addition, a numerical calculation method using the power-flow matrix was formulated to perform a fast beam-energy calculation with a simple algorithm. This method can be used to obtain the target RF waveform for energy-spread compensation.

Original languageEnglish
Pages (from-to)116-126
Number of pages11
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-3
Publication statusPublished - 2005 Feb 11
Externally publishedYes


  • Beam-loading compensation
  • Electron linac
  • Multi-bunch
  • RF modulation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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