Quantum Efficiencies of Mg Photocathode under Illumination with 3rd and 4th Harmonics Nd: LiYF4 Laser Light in RF Gun

概要

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A Mg photocathode for use in a radio-frequency gun was manufactured by a technique of hot isostatic pressing with diamond polishing and tested under a peak electric field of 57 MV/m. A laser cleaning process for the Mg cathode was developed. The quantum efficiency ($\mathit{QE}$) of the Mg cathode before and after the laser cleaning was measured under illumination with 262 nm and 349 nm laser light. A high $\mathit{QE}$ of up to $1.0\times 10^{-3}$ was achieved under the 262 nm laser-light illumination. The $\mathit{QE}$ of the Mg cathode under the 349 nm laser-light illumination was measured to be $2.2\times 10^{-5}$. The dependence of the $\mathit{QE}$ on the electric field was measured and compared with a theoretical analysis including the Schottky effect.
INSTITUTE OF PURE AND APPLIED PHYSICSの論文
2003-03-15