Measurement of temporal response of transmission-type spin-polarized photocathodes

Spin polarized electron beam is essential for the high energy particle physics experiment 'International Linear Collider'. In Nagoya University, transmission-type spin-polarized photocathodes, in which the laser light is injected from the back side of the photocathode have been developed. In the development of the electron source, the quantum efficiency of 0.5% and the polarization of ∼90% were achieved. However, the response time of the transmission-type electron source is not evaluated. We are planning to measure the response time by using a RF deflecting cavity. In this paper, the details of the measurement system are reported. (author)