Emittance measurements of electron beams from diamond field emitter arrays
Scanning electron microscope image of a 5 μm pitch DFEA. Typical tip radii are on the order of 5–10 nm.
(Color online) Experimental arrangement for measuring the emittance of electron beams from DFEAs. A pepperpot, used as the anode, produces beamlets that subsequently expand in a field free region before impacting a phosphor screen. The spot size at the phosphor is used to infer the beam divergence.
(Color online) Phosphor image of beamlets from the pepperpot. The largest beamlet, which includes electrons from many emitters, has a Gaussian profile and indicates a normalized divergence of .
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