A model of flashboard breakdown with empirical scaling laws

Tetra is using multiple surface-spark arrays for pre-ionizing self-sustained and for UV-sustained high pressure glow discharges. A three-stage model of single row multiple spark arrays has been developed based on experimental data. Stage 1 involves initial charging and conditioning of the board. During Stage 2, primary arcs are formed in the first few gaps but extinguish in tens of picoseconds. In Stage 3, the arcs are sustained until complete breakdown of the row is achieved. Empirical scaling laws have been determined which relate key parameters to the minimum row breakdown voltage as a function of the number of gaps in a row. This model is also extended to multiple row flashboards and enables a-priori prediction of flashboard impedance