Table 3.

Model parameters used for state of the art and the current work.

	modelling previous data	modelling our data
${\phi }_c$	d = 20 mm, 6 kV [18]	d = 10 mm, 4.8 kV
	d = 30 mm, 6 kV [17]	d = 20 mm, 6.5 kV
		d = 30 mm, 7 kV
$L_c$	17 mm for both cases	$10+\beta (d-10)\hspace{0.17em}\text{and}\hspace{0.17em}\beta =1$