Emittance Measurements on Field Emitter Diodes
CALIFORNIA UNIV BERKELEY LAWRENCE LIVERMORE LAB
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On the basis of time-integrated emittance measurements, several different types of field emitter diodes were investigated at 1-3 kA, 1 MeV. The experimental parameters were the cathode type, the anode mesh texture, the diode spacing and voltage, and the level of collimation of the emerging beam. Over a wide range, the emittance was found to be proportional to the level of collimation. With the diode spacing left fixed, the emittance was found to be essentially independent of the diode voltage and current. The lowest emittances 30-40 mr-cm at 400 A were obtained with a foil-type cathode in a ball-over-plane configuration.
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