Beam Dynamics Team

The team does research on generation, precise control and stabilization of brilliant electron beams on the basis of charged particle dynamics and electrodynamics. The team also does research on optimum schemes for Seeded FEL in wavelengths from soft to hard X-rays.

Research Subjects

• Research on fully coherent x-ray FELs.
• Precise control and stabilization of the SACLA high brightness electron beam.
• Development of the electron beam distribution system to SACLA beamlines.

Publications

1. Hara T, Togawa K, Tanaka H.:
   "Transverse envelope analysis for accelerating relativistic electron beams in a linear accelerator as a photon source."
   NUCL INSTRUM METH A, vol.624, p.65 (2010)
2. Togawa K, Hara T, Tanaka H.:
   "Electron-bunch compression using a dynamical nonlinearity correction for a compact x-ray free-electron laser."
   PRST-AB, vol.12, p.080706 (2009)
3. Shintake T, Tanaka H, Hara T, Tanaka T, Togawa K,et al.:
   "Stable operation of a self-amplified spontaneous-emission free-electron laser in the extremely ultraviolet region."
   T-AB, vol.12, p.070701 (2009)
4. Lambert G, Hara T, Garzella D, Tanikawa T, Labat M, et al.:
   "Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light."
   Nature Physics, vol. 4, p.296 (2008)
5. Shintake T, Tanaka H, Hara T, Togawa K, Tanaka T, et al.:
   "A compact free-electron laser for generating coherent radiation in the extreme ultraviolet region."
   Nature Photonics 2, p. 555 (2008)
6. Hara T, Togawa K, Tanaka H.:
   "BEAM OPTICS AND PARMETER DESIGN OF THE XFEL/SPRING-8."
   Proc. FEL conference 2010, Malmo, p.111 (2010)
7. Tanaka H, Togawa K, Hara T, Yamanoto.:
   "A NEW BEAM-BASED ALIGNMENT OF UNDULATOR SEGMENTS FOR X-RAY FREE-ELECTRON LASERS (XFEL)."
   Proceedings of the 7th Annual Meeting of Particle Accelerator Society of Japan (in Japanese), Himeji, p.207 (2010)
8. Togawa K, Tajiri Y, Hara T, Tanaka H.:
   "DEVELOPMENT OF AN ENVELOPE SIMULATION MODEL FOR A LOW-EMITTANCE SPACE-CHARGED BEAM."
   Proceedings of the 7th Annual Meeting of Particle Accelerator Society of Japan (in Japanese), Himeji, p.434 (2010).
9. Kano Y, Hara T, Takebe H, Fukami K, Kumagai N.:
   "XFEL ELECTRO-MAGNETS AND THEIR EXCITATION CHARACTERISTICS,"
   Proceedings of the 7th Annual Meeting of Particle Accelerator Society of Japan (in Japanese), Himeji, p.558 (2010)
10. Hara T, Togawa K, Tanaka H.:
    "ELECTRON BUNCH COMPRESSION WITH DYNAMICAL NON-LINEARLITY CORRECTION FOR A COMPACT FEL."
    FEL conference 2009, Liverpool, p.215 (2009)