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Abstract <p>To determine the minimal current value at which an arc discharge can exist, the probability of breakdown and relaxation of the discharge to the arc stage was studied. A high voltage was maintained between the cathode and the anode for 1.3 μs under high vacuum conditions. A cable generator generating a pulse of 1.3 μs with an amplitude of 25 kV was used to create a voltage pulse. Resistors in the anode circuit were used to limit the discharge current. In this investigation, the arc discharge current varied from 3 to 0.03&#xa0;A. The probability of establishing a stable discharge current after breakdown on copper, tungsten, and tungsten coated with W-FUZZ nanostructures was estimated. The results of statistical processing show that the threshold current can be estimated using a certain probability of exceeding a certain duration. However, there is also a threshold current value at which the functioning of the arc discharge is impossible. Absolute values of the threshold current can be an order of magnitude less than the previously determined probability values.</p>

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Vacuum Arc Threshold Current: Estimation of the Minimum Value under the Direct High Voltage

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • I. L. Muzyukin,
  • P. S. Mikhailov,
  • I. V. Uimanov,
  • S. A. Barengolts

摘要

Abstract

To determine the minimal current value at which an arc discharge can exist, the probability of breakdown and relaxation of the discharge to the arc stage was studied. A high voltage was maintained between the cathode and the anode for 1.3 μs under high vacuum conditions. A cable generator generating a pulse of 1.3 μs with an amplitude of 25 kV was used to create a voltage pulse. Resistors in the anode circuit were used to limit the discharge current. In this investigation, the arc discharge current varied from 3 to 0.03 A. The probability of establishing a stable discharge current after breakdown on copper, tungsten, and tungsten coated with W-FUZZ nanostructures was estimated. The results of statistical processing show that the threshold current can be estimated using a certain probability of exceeding a certain duration. However, there is also a threshold current value at which the functioning of the arc discharge is impossible. Absolute values of the threshold current can be an order of magnitude less than the previously determined probability values.