Advanced X-Ray Laser Laboratory

The mission of Advanced X-ray Laser Laboratory is to upgrade the light source performance of SACLA (XFEL: X-ray free electron laser facility) and SPring-8 (large-scale SR: synchrotron radiation facility), which are in operation in RIKEN SPring-8 Center (RSC). We are developing magnetic devices called undulators, which produce intense X-ray laser and highly brilliant SR by deflecting the high energy electron beam. We also explore more advanced XFEL and SR concepts that will open up a new possibility of X-ray science. By promoting these R&Ds, we pursue the goal of enhancing the light source performances of SACLA and SPring-8, and establish an “ultimate X-ray laser facility” in RSC, which eventually leads to creation of a new field of photon science exploiting X-ray lasers.

Research Fields

Physics / Engineering

Research Subjects

• Development of pulse compression schemes in XFELs
• Development of fundamental technologies toward next-generation undulators
• Exploration of new light source concepts in SR and XFEL

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, T. Togashi, Y. Inubushi, T. Sato, T. Tanaka, T. Kimura, H. Yokoyama, J. Kim, Y. Sano, Y. Hachisu, M. Yabashi, H. Ohashi, H. Ohmori, T. Ishikawa and K. Yamauchi
   “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, K. Togawa, M. Yabashi and H. Tanaka
   “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, T. Kameshima, K. Togawa, T. Hara, T. Tanaka, H. Tanaka, T. Ishikawa and M. Yabashi
   “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, M. Bruegger, W. Bulgheroni, B. Jakob and H. Kitamura
   “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