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Takashima, Y.

Paper Title Page
MOPC041 Microfabrication of Relativistic Electron Beam by Laser and its Application to THz Coherent Synchrotron Radiation 163
 
  • M. Katoh, M. Adachi, S. I. Kimura, A. Mochihashi, M. Shimada
    UVSOR, Okazaki
  • S. Bielawski, C. Evain, C. Szwaj
    PhLAM/CERCLA, Villeneuve d'Ascq Cedex
  • T. Hara
    RIKEN Spring-8 Harima, Hyogo
  • M. Hosaka, Y. Takashima, N. Yamamoto
    Nagoya University, Nagoya
  • T. Takahashi
    KURRI, Osaka
 
  It is well known that broadband coherent synchrotron radiation (CSR) is emitted by an electron bunch whose length is shorter than radiation wavelength. However, even a long electron bunch can emit CSR when it has micro-density structure whose characteristic length is equal to the radiation wavelength. Recently, we have demonstrated that, by injecting amplitude modulated laser pulses into an electron storage ring, quasi-monochromatic and tunable terahertz (THz) CSR could be produced. In this method, periodic micro-density structure of THz scale was created on the electron bunch, as the result of the laser-electron interaction. The bunch emitted quasi-monochromatic THz radiation in a uniform dipole filed, not in an undulator. This new technology provides a way to imprint periodic wave patterns inside the electron bunch phase space. In adding to the light source applications, this would be a new tool to investigate electron beam dynamics.  
WEPC028 Status of UVSOR-II and Light Source Developments 2046
 
  • M. Katoh, M. Adachi, K. Hayashi, M. Shimada, J. Yamazaki
    UVSOR, Okazaki
  • M. Hosaka, Y. Takashima, N. Yamamoto
    Nagoya University, Nagoya
  • A. Mochihashi
    JASRI/SPring-8, Hyogo-ken
 
  UVSOR, a 750 MeV synchrotron light source of 53m circumference had been operated for more than 20 years. After a major upgrade in 2003, this machine was renamed to be UVSOR-II. The ring is now routinely operated with low emittance of 27 nm-rad and with four undulators. Top up injection is under preparation. The ring is equipped with a resonator type free electron laser. The shortest wave length has reached 200nm. Several user experiments in the deep UV region are in progress. Coherent terahertz synchrotron radiation and coherent harmonic generation are extensively studied by using an ultra-short laser system, under international collaborations. An upgrade plan of the ring is under consideration to improve the experimental setup of the light source developments.