The Use of an Electron Microchannel as a Self-Extracting and Focusing Plasma Cathode Electron Gun

S. CORNISH; J. KHACHAN

doi:10.1088/1009-0630/18/2/07

Plasma Science and Technology > 2016 > 18(2): 138-142. > DOI: 10.1088/1009-0630/18/2/07

S. CORNISH, J. KHACHAN. The Use of an Electron Microchannel as a Self-Extracting and Focusing Plasma Cathode Electron Gun[J]. Plasma Science and Technology, 2016, 18(2): 138-142. DOI: 10.1088/1009-0630/18/2/07

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The Use of an Electron Microchannel as a Self-Extracting and Focusing Plasma Cathode Electron Gun

School of Physics, The University of Sydney, Sydney, NSW 2006, Australia

Funds: supported by the Framework of the “Broader Approach Internationals Agreement”

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Received Date: January 18, 2015

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Abstract

Abstract

A new and simple type of electron gun is presented. Unlike conventional electron guns, which require a heated filament or extractor, accelerator and focusing electrodes, this gun uses the collimated electron microchannels of an inertial electrostatic con?nement (IEC) discharge to achieve the same outcome. A cylindrical cathode is placed coaxially within a cylindrical anode to create the discharge. Collimated beams of electrons and fast neutrals emerge along the axis of the cylindrical cathode. This geometry isolates one of the microchannels that emerge in a nega?tively biased IEC grid. The internal operating pressure range of the gun is 35-190 mTorr. A small aperture separates the gun from the main vacuum chamber in order to achieve a pressure differen?tial. The chamber was operated at pressures of 4-12 mTorr. The measured current produced by the gun was 0.1-3 mA (0.2-14 mA corrected measurement) for discharge currents of 1-45 mA and discharge voltages of 0.5-12 kV. The collimated electron beam emerges from the aperture into the vacuum chamber. The performance of the gun is una?ected by the pressure differential between the vacuum chamber and the gun. This allows the aperture to be removed and the chamber pressure to be equal to the gun pressure if required.
- electron beam,
- electron gun,
- plasma gun,
- neutral gun,
- hollow cathode,
- elec?tron beam,
- , microchannel,
- EC,
- inertial electrostatic confinement

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References

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