Short wavelength light sources and applications (1)

[ALPS27-02(Invited)] New concept toward realization of attosecond FELs and its experimental demonstration

*Takashi Tanaka¹, Yuichiro Kida², Satoshi Hashimoto³, Shuji Miyamoto^3,5, Tadashi Togashi^2,1, Hiromitsu Tomizawa^2,1, Aoi Gocho⁴, Keisuke Kaneshima⁴, Yoshihito Tanaka^4,1 (1. RIKEN SPring-8 Center, 2. Japan Synchrotron Radiation Research Institute, 3. Laboratory of Advanced Science and Technology for Industry, University of Hyogo, 4. Department of Material Science, University of Hyogo, 5. Institute of Laser Engineering, Osaka University)

A proposal has been made to break the theoretical lower limit on the pulse length in FELs by means of “chirped microbunching.” We experimentally demonstrated its fundamental mechanism in the NEWSUBARU storage ring.