期刊
JOURNAL OF APPLIED PHYSICS
卷 103, 期 5, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.2838209
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资金
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [GRANTS:13678712, 0807731] Funding Source: National Science Foundation
The thermal emittance and temporal response of a photocathode set an upper limit on the maximum achievable electron beam brightness from a photoemission electron source, or photoinjector. We present measurements of these parameters over a broad range of laser wavelength for two different negative electron affinity (NEA) photocathodes. The thermal emittance of NEA GaAs and GaAsP has been measured by two techniques-a measurement of the beam size downstream from a solenoid, whose strength was varied, and a double slit transmission measurement-for different laser spot sizes and shapes. The effect of space charge on the beam spot size allows a good estimation of the photoemission response time from these cathodes. Both cathodes show a subpicosecond response for laser wavelengths shorter than 520 nm. (C) 2008 American Institute of Physics.
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