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RIKEN SPring-8 Center Advanced Beam Diagnosis Team

Team Leader: Hirokazu Maesaka (D.Sc.)

Research Summary

Hirokazu Maesaka

We are conducting the research and development of beam diagnostic instruments for accurate and stable measurements of high-energy electron beams in the X-ray free-electron laser facility, SACLA, and the large synchrotron radiation facility, SPring-8. We are also engaged in the research on beam diagnostic schemes and the development of diagnostic instruments for SPring-8-II, which is the upgrade project of SPring-8. We are studying the sensor part to capture the beam signal, high-speed readout electronics to process the obtained signal, and analysis methods to evaluate the physical quantity of the beam.

Main Research Fields

  • Interdisciplinary Science & Engineering

Related Research Fields

  • Engineering
  • Mathematical & Physical Sciences
  • Accelerators
  • Beam physics
  • Radiation detectors

Keywords

  • X-ray free-electron laser
  • Synchrotron radiation
  • Beam diagnostics
  • Signal processing
  • Measuring instruments

Selected Publications

  • 1. Togawa, K., Maesaka, H., Kobana, R., Tanaka, H.:
    "Frequency-segmented power amplification using multi-band radio frequency amplifiers to produce a high-voltage pulse"
    Review of Scientific Instruments 93, p. 073304 (2022).
  • 2. Masaki, M., Maesaka, H., Soutome, K., Takano, S., Watanabe, T., Kubota, K., Fujita, T., Dewa, H., Fukui, T., Sugimoto, T., Takeuchi, M., Tanaka, H.:
    "Adaptive feedforward control of closed orbit distortion caused by fast helicity-switching undulators"
    Journal of Synchrotron Radiation 28, pp. 1758-1768 (2021).
  • 3. Otake, Y., Maesaka, H., Matsubara, S., Hosoda, N., Ohshima, T.:
    "Timing and low-level rf system for an x-ray laser"
    Physical Review Accelerators and Beams 19, p. 022001 (2016).
  • 4. Ohshima, T., Maesaka, Matsubara, S., Otake, Y.:
    "Error compensation of IQ modulator using two-dimensional DFT"
    Nuclear Instruments and Methods A 820, pp. 65-74 (2016).
  • 5. Ego, H., Maesaka, H., Sakurai, T., Otake, Y., Hashirano, T., Miura, S.:
    "Transverse C-band deflecting structure for longitudinal electron-bunch-diagnosis in XFEL “SACLA""
    Nuclear Instruments and Methods A 795, pp. 381-388 (2015).
  • 6. Otake, Y., Maesaka, H., Matsubara, S., Inoue, S., Yanagida, K., Ego, H., Kondo, C., Sakurai, T., Matsumoto, T., Tomizawa, H.:
    "Beam monitor system for an x-ray free electron laser and compact laser"
    Physical Review Special Topics - Accelerators and Beams 16, p. 042802 (2013).
  • 7. Maesaka, H., Ego, H., Inoue, S., Matsubara, S., Ohshima, T., Shintake, T., Otake, Y.:
    "Sub-micron resolution rf cavity beam position monitor system at the SACLA XFEL facility"
    Nuclear Instruments and Methods A 696, pp. 66-74 (2012).
  • 8. Otake, Y., Ohshima, T., Hosoda, N., Maesaka, H., Fukui, T., Kitamura M., Shintake, T.:
    "LLRF and timing system for the SCSS test accelerator at SPring-8"
    Nuclear Instruments and Methods A 696, pp. 151-163 (2012).

Recent Research Results

Lab Members

Principal investigator

Hirokazu Maesaka
Team Leader

Contact Information

Structural Biology Facility
1-1-1 Kouto, Sayo-cho
Sayo-gun, Hyogo
679-5148 Japan
Email: hirokazu.maesaka [at] riken.jp

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