[en] 3D visualization of Cherenkov radiation in water generated by an electron beam from the 28 MeV linac of University of Tokyo was performed. We introduced the light emission computed tomography theory. We adopted the fan beam projection using a rotating mirror, a collimator, an optical fiber and a photo-multiplier. Cherenkov radiation passing through the collimator enter a photo-multiplier via an optical fiber. The optical fiber should be shielded against X rays. At the first stage, we succeeded in reconstructing the image of distribution of Cherenkov radiation in water, with the nanosecond time resolution. (author)

[en] Femtosecond quantum phenomena research project is proposed at Nuclear Engineering Research Laboratory, University of Tokyo. The research facility consists of an X-band (11.424 GHz) femtosecond electron linac, a femtosecond wavelength tunable laser, two S-band (2.856 GHz) picosecond electron linacs and measuring equipments. Especially, we aim to generate a 100fs (FWHM) electron single bunch with more than 1nC at the X-band linac. Ultrafast processes in radiation physics, chemistry, material science and microscopic electromagnetic phenomena are going to be analyzed there. The specification of the facility is presented. (author)