Author: Ichihashi, F.
Paper Title Page
WEOAB01 Highly Polarized and High Quantum Efficiency Electron Source Using Transmission-type Photocathode 1950
 
  • N. Yamamoto, F. Ichihashi, A. Mano, T. Nakanishi, Y. Takeda, T. Ujihara
    Nagoya University, Nagoya, Japan
  • X.G. Jin
    Institute for Advanced Research, Nagoya, Japan
 
  The GaAs-type semiconductor photocathodes (PCs) with a negative electron affinity surface have been used as a polarized electron source and are expected as electron sources for next generation accelerators, such as Linear Colliders and Energy Recovery Linacs. Recently, we have developed transmission-type photocathodes (T-PCs). By using T-PCs, polarized electron beam is extracted from the back-side of laser irradiation-side. This scheme offers great merits in designing electron guns, such as short focusing of the laser light for a high brilliance electron beam and a simple geometrical structure avoiding an interference problem between the laser and the electron beam. The layer structure of the MOVPE-grown superlattice photocathode and the performance of 90% polarization, a super high brilliance, and a high quantum efficiency will be reported.  
slides icon Slides WEOAB01 [6.007 MB]