The application of a short, pulsed excitation is known to allow for higher power deposition into microdischarges without the onset of instabilities. Here, a MOSFET-based high voltage pulser is used to drive a 50-torr argon microdischarge with short pulsed currents of (∼ 75) A, with (<100)-ns full-width at half-maximum, and a repetition rate of 1 MHz. With this excitation, an average power density of (∼ 10 13) W/m 3) is achieved, with a peak power density (∼ 3.10 14) W/m3. A high speed iCCD camera is used to observe ignition processes and confirm the absence of unstable operation. The images were taken using a 5-ns gate time with a spatial resolution of (∼ 2.5~μm.
- Microdischarge (MD)
- pulsed discharge.