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To increase the quantum efficiency(QE) of a copper photocathode and reduce the thermal emittance of an electron beam,a drive laser with oblique incidence was adopted in a BNL type photocathode rfgun.The disadvantageous e?ects on the beam quality caused by oblique incidence were analyzed qualitatively.A simple way to solve the problems through wavefront shaping was introduced and the beam quality wasimproved.
To increase the quantum efficiency (QE) of a copper photocathode and reduce the thermal emission of an electron beam, a drive laser with was incidence incidence of a BNL type photocathode rfgun. were analyzed qualitatively. A simple way to solve the problems through wavefront shaping was introduced and the beam quality wasimproved.