Publication: Instabilities of electrical properties of He-induced W "fuzz" within the pre-breakdown and breakdown regimes
Дата
2021
Авторы
Zemskov, Yu. A.
Mamontov, Yu. I.
Uimanov, I. V.
Zubarev, N. M.
Kaziev, A. V.
Kharkov, M. M.
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© 2021 Institute of Physics Publishing. All rights reserved.The investigation of the He-induced W "fuzz" electrical properties was carried out. For the research, an automated experimental setup was designed. The setup was based on a vacuum chamber operated under high vacuum conditions (~ 10–7 Pa). The vacuum diode under investigation comprised of a flat W “fuzz” cathode with an area of about 1 cm2 and a 2 mm radius cylindrical copper anode with a hemisphere tip. The cathode-anode distance was about 100 µm. The voltage applied was up to 10 kV. A DAC/ADC module controlled an HV power supply and automatically registered currents and voltages in the circuit. The effect of a spontaneous change in the emissive ability of the investigated surface area was observed. These changes can vary significantly in magnitude. Large-scale changes can lead to a permanent increase in the emissive ability of a specific area or to a breakdown of the gap. Small changes, as a rule, are reversible, have a stepped nature, and make it difficult to record and interpret the current-voltage characteristics of the field emitter.
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Instabilities of electrical properties of He-induced W "fuzz" within the pre-breakdown and breakdown regimes / Zemskov, Yu.A. [et al.] // Journal of Physics: Conference Series. - 2021. - 2064. - № 1. - 10.1088/1742-6596/2064/1/012004