Ultraviolet stimulated electron source for use with low energy plasma instrument calibration

Details Ultraviolet stimulated electron source for use with low energy plasma instrument calibration Ultraviolet stimulated electron source for use with low energy plasma instrument calibration

2011-08-19

arxiv.org/abs/1108.4015v2

Physics

Space Physics

12, 5 figures

Scientific paper

We have developed and demonstrated a versatile, compact electron source that can produce a monoenergetic electron beam up to 50 mm diameter from 0.1 to 30 keV with an energy spread of <10 eV. By illuminating a metal cathode plate with a single near ultraviolet (UV) light emitting diode (LED), a spatially uniform electron beam with 15% variation over 1 cm2 can be generated. A uniform electric field in front of the cathode surface accelerates the electrons into a beam with an angular divergence of <1? at 1 keV. The beam intensity can be controlled from 10^9 electrons/cm2s.

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