Super-High Brightness and High-Spin-Polarization Photocathode
2008; Institute of Physics; Volume: 1; Linguagem: Inglês
10.1143/apex.1.045002
ISSN1882-0786
AutoresXiuguang Jin, Naoto Yamamoto, Yasuhide Nakagawa, Atsushi Mano, Takanori Kato, Masatoshi Tanioku, Toru Ujihara, Yoshikazu Takeda, Shoji Okumi, Masahiro Yamamoto, Tsutomu Nakanishi, Takashi Saka, Hiromichi Horinaka, Toshihiro Kato, Tsuneo Yasue, T. Koshikawa,
Tópico(s)Gyrotron and Vacuum Electronics Research
ResumoUsing a newly developed transmission-type photocathode, an electron beam of super-high brightness [(1.3±0.5)×107 A·cm-2·sr-1] was achieved. Moreover, the spin-polarization was as high as 90%. We fabricated a transmission-type photocathode based on a GaAs–GaAsP strained superlattice on a GaP substrate in order to enhance the brightness and polarization greatly. In this system, a laser beam is introduced through the transparent GaP substrate. The beam is focused on the superlattice active layer with a short focal length lens. Excited electrons are generated in a small area and extracted from the surface. The shrinkage of the electron generation area improved the brightness. In addition, a GaAs layer was inserted between the GaP substrate and the GaAsP buffer layer to control the strain relaxation process in the GaAsP buffer layer. This design for strain control was key in achieving high polarization (90%) in the transmission-type photocathode.
Referência(s)