FEL Physics Team

FEL physics team is in charge of development of devices called undulators, which induce interaction between radiation and electron beam to realize x-ray lasing. In addition, theoretical research and new XFEL scheme are explored to futher upgrade the laser performance of SACLA.

Research Subjects

• Exploration of new schemes for an ultimate XFEL
• Development and upgrade of XFEL simulation code
• R&D toward an ultra narrow gap operation of SACLA in-vacuum undulators
• Development of next-generation insertion devices
• Construction of SACLA new beamlines and implementing the seeding option

Publications

1. T. Tanaka:
   "Proposal for a Pulse-Compression Scheme in X-Ray Free-Electron Lasers to Generate a Multiterawatt, Attosecond X-Ray Pulse"
   Phys. Rev. Lett., 110 (2013) 084801
2. H. Yumoto, H. Mimura, T. Koyama, S. Matsuyama, K. Tono, et al.:
   "Focusing of X-ray free electron laser pulses with reflective optics"
   Nature Photon., 7 (2013) 43
3. T. Tanaka, S. Goto, T. Hara, T. Hatsui, H. Ohashi, et el.:
   "Undulator commissioning by characterization of radiation in x-ray free electron lasers"
   Phys. Rev. ST-AB, 15 (2012) 110701
4. Y. Inubushi, K. Tono, T. Togashi, T. Sato, T. Hatsui, et al.:
   "Determination of the Pulse Duration of an X-Ray Free Electron Laser Using Highly Resolved Single-Shot Spectra"
   Phys. Rev. Lett., 109 (2012) 144801
5. T. Ishikawa, H. Aoyagi, T. Asaka, Y. Asano, N. Azumi, et al.:
   "A compact X-ray free-electron laser emitting in the sub-angstrom region"
   Nature Photon., 6 (2012) 540
6. T. Tanaka and H. Kitamura:
   "A new undulator scheme providing various polarization states with low on-axis power density"
   Nucl. Instrum. Meth., A659 (2011) 537
7. T. Tanaka and H. Kitamura:
   "Composite period undulator to improve the wavelength tunability of free electron lasers"
   Phys. Rev. ST-AB, 14 (2011) 050701
8. T. Togashi, E. J. Takahashi, K. Midorikawa, M. Aoyama, K. Yamakawa, et al.:
   "Extreme ultraviolet free electron laser seeded with high-order harmonic of Ti:sapphire laser"
   Opt. Ex., 19 (2011) 317
9. T. Tanaka, T. Seike, A. Kagamihata, T. Schmidt, A. Anghel, et al.:
   "In situ correction of field errors induced by temperature gradient in cryogenic undulators"
   Phys. Rev. ST-AB, 12 (2009) 120702
10. T. Tanaka and H. Kitamura:
    "Universal function for the brilliance of undulator radiation considering the energy spread effect"
    J. Synchrotron Rad., 16 (2009) 380