An experimental and numerical approach to breakdown behavior in gas discharge between Mn nano-flower thinfilm as cathode and a stainless-steel ball as anode

This paper reports the experimental and numerical results of the gas discharge influenced by the first and second Townsend coefficient in the self-sustain discharge regime based on the Paschen’s law. Breakdown voltage between the two electrodes as a function of product of pd (p is pressure ۰.۱XOOPIC has been employed. PIC-MCC (particle-in-cell, Monte Carlo collision) technique has been used to calculate the breakdown voltage and second Townsend coefficient in XOOPIC package. The obtained results in XOOPIC show a good agreement with the experimental results in high pressure regime, whereas in the low pressure there was a stark difference between them. The weakening of avalanche at lower concentration and the rapid growth of avalanche at higher concentration of gas particles in anode/cathode spacing have been attributed to the modification of the electric field due to space charge, and at high pressures the charge careers initiate streamer. The XOOPIC code has been written based on streamer breakdown of spark, therefore the numerical results at low pressure have not been matched with experimental data.

کلیدواژه ها:

Gas discharge ، townsend coefficient ، Paschen’s law ، XOOPIC ، streamer breakdown ، PIC-MCC