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Hagmann MJ, Christensen DA, Mousa MS, et al. Anomalous high-frequency oscillations in a field emission tube and their significance in pulsed field emission. Ultramicroscopy. 2007;107(9):854-6doi: 10.1016/j.ultramic.2007.02.019.
Hagmann, M. J., Christensen, D. A., Mousa, M. S., Baturin, A., & Sheshin, E. P. (2007). Anomalous high-frequency oscillations in a field emission tube and their significance in pulsed field emission. Ultramicroscopy, 107(9), 854-6. https://doi.org/10.1016/j.ultramic.2007.02.019
Hagmann, M J, et al. "Anomalous high-frequency oscillations in a field emission tube and their significance in pulsed field emission." Ultramicroscopy vol. 107,9 (2007): 854-6. doi: https://doi.org/10.1016/j.ultramic.2007.02.019
Hagmann MJ, Christensen DA, Mousa MS, Baturin A, Sheshin EP. Anomalous high-frequency oscillations in a field emission tube and their significance in pulsed field emission. Ultramicroscopy. 2007 Sep;107(9):854-6. doi: 10.1016/j.ultramic.2007.02.019. Epub 2007 Mar 04. PMID: 17485175.
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Ultramicroscopy. 2007 Sep;107(9):854-6. doi: 10.1016/j.ultramic.2007.02.019. Epub 2007 Mar 04.

Anomalous high-frequency oscillations in a field emission tube and their significance in pulsed field emission.

Ultramicroscopy

M J Hagmann, D A Christensen, M S Mousa, A Baturin, E P Sheshin

Affiliations

  1. NewPath Research, Salt Lake City, Utah 84110, USA.

PMID: 17485175 DOI: 10.1016/j.ultramic.2007.02.019

Abstract

Relaxation oscillations occur when a capacitor is inserted in series with a field emission tube, a DC high-voltage power supply, and a ballast resistor. The waveform of these oscillations is highly reproducible with a dominant frequency of 200 MHz and a decay time of 20 ns. The peak current as high as 320 mA has been observed although the tungsten emitter is only rated for 10 microA. We have shown that these oscillations are due to a displacement current, charging of the anode-tip capacitance, and are not of a field emission origin. We conclude that the effects of displacement current should be considered in measurements of field emission with microsecond pulses, where high-current densities can be observed.

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