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METHOD AND APPARATUS FOR ENHANCING QUANTUM EFFICIENCY (QE) OF PHOTOCATHODE WITH SURFACE ACOUSTIC WAVES (SAW) AND APPLYING SURFACE ACOUSTIC WAVES (SAW) TO ELECTRON PHOTOINJECTOR
METHOD AND APPARATUS FOR ENHANCING QUANTUM EFFICIENCY (QE) OF PHOTOCATHODE WITH SURFACE ACOUSTIC WAVES (SAW) AND APPLYING SURFACE ACOUSTIC WAVES (SAW) TO ELECTRON PHOTOINJECTOR
In a particular embodiment, a method is disclosed that includes exciting one or more surface acoustic waves (SAW) on a surface of a piezoelectric substrate of a photocathode of a photoinjector using one or more interdigital tranducers (IDT). The method also includes optically generating electrons (e) and holes (h) in the photocathode using an incident laser beam. The method also includes changing at least one of a recombination probability and a recombination rate of at least some electrons (e) and holes (h) in the photocathode producing a high-current electron gun having an increased beam brightness, which is a ratio of electron beam current to electron beam emittance, due to at least one of a decreased electron beam emittance of electrons photoemitted from the photocathode of the photoinjector and an increased electron beam current. The method results in enhancing a quantum efficiency (QE) of photoemission by the photocathode of the photoinjector, leading to production of intense, low emittance electron bunches at a high repetition rate using laser excitation. Also disclosed are devices based on the disclosed method.
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