New light source in a submillimeter to millimeter range using the coherent radiation from the single-bunch electron beam at ISIR

The coherent synchrotron radiation has a continuous spectrum in a submillimeter to millimeter range and is highly intense compared with the other far-infrared light sources. A new light source was established by using the coherent radiation from the intense single-bunch electron beam generated with the 38 MeV L-band linear accelerator at The Institute of Scientific and Industrial Research, Osaka University. In the experiments the beams at an energy of 27 MeV and a charge of electrons in a bunch of 30 nC were used. The intensity, stability and polarization of the coherent synchrotron radiation were measured at wavelengths of 0.7–1.4 mm. The absorption spectroscopy was carried out for N2O gas. The results agreed with those obtained by calculation. The application of the pulsed radiation which is synchronized with the electron bunch, to stroboscopic pulse-radiolysis experiments is under preparation.