RIKEN SPring-8 Center Advanced Electron Gun Development Team
Team Leader: Kazuaki Togawa (D.Sc.)
Research Summary
The Advanced Electron Gun Development Team leads the quality upgrade of the SACLA XFEL in terms of brightness, pulse structure, and stability by developing new electron source technologies. Our research is focused on: (i) search for electron cathodes delivering ultrahigh brightness beams, (ii) electron gun and injector optimization for achieving minimum emittance, (iii) laser-based control of the beam phase-space. Our research takes advantage of basic sciences: beam physics, material and surface science, laser technology, and high-voltage engineering. We aim at developing novel electron sources and accelerators that will enable access to new science fields.
Main Research Fields
- Mathematical & Physical Sciences
Related Research Fields
- Engineering
- Interdisciplinary Science & Engineering
- Quantum beam science-related
Keywords
- Electron source
- Cathode
- Material and surface science
- Beam dynamics
- X-ray free-electron laser
Selected Publications
Papers with an asterisk(*) are based on research conducted outside of RIKEN.
- 1.
Goryashko V., Togawa K., and Opanasenko A.:
"Design study of a high-brightness high-repetition rate thermionic injector for free-electron laser application. II. Gun technology"
Physical Review Accelerators and Beams 28, 110101 (2025)
doi: 10.1103/srht-5hmq - 2.
Goryashko V., Togawa K., Sal´en P., and Opanasenko A.:
"Design study of a high-brightness high-repetition rate thermionic injector for free-electron laser application: The architecture"
Physical Review Accelerators and Beams 28, 091601 (2025)
doi: 10.1103/b7sd-jvxq - 3.
Goryashko V., Opanasenko A., and Togawa K.:
"Self-aberration in high-brightness uniformly charged particle beams"
Results in Physics 68, 108096 (2025)
doi: 10.1016/j.rinp.2024.108096 - 4.
Togawa K.:
"Slice emittance measurements using a slit-grid system and a fast wall-current monitor"
Review of Scientific Instruments 95, 043304 (2024)
doi: 10.1063/5.0191141 - 5.
Magome T., Togawa K., and Tanaka H.:
"Precise measurement of the work function of a hot CeB6 thermionic cathode through photoelectron yield spectroscopy using a tunable pulsed laser"
Journal of Applied Physics 133, 165107 (2023)
doi: 10.1063/5.0139366 - 6.
Togawa K., Maesaka H., Kobana R., and Tanaka H.:
"Frequency-segmented power amplification using multi-band radio frequency amplifiers to produce a high-voltage pulse"
Review of Scientific Instruments 93, 073304 (2022)
doi: 10.1063/5.0093915 - 7.
Ishikawa T. et al.:
"A compact X-ray free-electron laser emitting in the sub-angstrom region"
Nature Photonics 6, pp.540 (2012)
doi: 10.1038/nphoton.2012.141 - 8.
Shintake T. et al.:
"A compact free-electron laser for generating coherent radiation in the extreme ultraviolet region"
Nature Photonics 2, pp.555 (2008)
doi: 10.1038/nphoton.2008.134 - 9.
Togawa K. et al.:
"CeB6 electron gun for low-emittance injector"
Physical Review Special Topics Accelerators and Beams 10, 020703 (2007)
doi: 10.1103/PhysRevSTAB.10.020703 - 10.
*Togawa K. et al.:
"Surface charge limit in NEA superlattice photocathodes of polarized electron source"
Nuclear Instruments and Methods in Physics Research A 414, pp.431 (1998)
doi: 10.1016/S0168-9002(98)00552-X
Lab Members
Principal investigator
- Kazuaki Togawa
- Team Leader
Contact Information
Email: togawa@spring8.or.jp