Simulation study on attosecond electro bunch generation

Pulse radiolysis, a stroboscopic method with an ultrashort electron bunch and an ultrashort light, is essential for the observation of ultrafast reactions. The time resolution of pulse radiolysis depends on the electron bunch length. In Osaka University, a 98-fs electron bunch was generated by using a photocathode electron linac for a development of femtosecond pulse radiolysis. Furthermore, a subfemtosecond/attosecond pulse radiolysis is proposed to study the ionization and thermalization processes in subfemtosecond/attosecond time region. In order to realize such a high time resolution, the possibility of attosecond electron bunch generation based on the photocathode RF gun linac and a magnetic bunch compressor was studied. In the simulation, the bunch length growths due to charge, transverse and longitudinal emittance were investigated.