Rise Time Effects of a Portable Inductive Energy Storage Pulse Generator on NO Production in Spark Discharges

This study investigates pulse waveform adjustment in a portable inductive energy storage (IES) pulsed power system and its effect on nitric oxide (NO) generation in atmospheric spark discharges.

While previous studies have focused on pulse energy, pulse width, and repetition rate, the role of rise time remains insufficiently explored.

Existing pulse generators with adjustable rise time are also bulky and unsuitable for portable applications.

To address these limitations, this study examines rise time control strategies within a compact IES architecture and employs a parallel high-voltage capacitor to generate adjustable waveforms.

Optical emission spectroscopy was used to measure excited N2 and NO gamma emissions, and a NO analyzer was used to monitor NO concentration.

In addition, electron excitation temperature, plasma-absorbed power, and rotational temperature were estimated to clarify the influence of waveform characteristics on plasma chemistry.

The results show that although rise time can be adjusted, it is coupled with pulse width and input energy in the system.

Comparative analysis of spectral intensities, NO concentration, electron excitation temperature, and absorbed energy indicates that NO production depends primarily on energy input rather than rise time.

Electrode temperature varies only minimally under different waveform conditions, suggesting that NO formation is mainly influenced by electron impact and ionization processes.

This work proposes a portable and simplified IES-based high-voltage pulsed power generator, identifies the constraints associated with rise time control, and demonstrates the feasibility of waveform adjustment.

The findings clarify the dominant mechanisms governing NO generation and provide a reference for the design of future portable plasma-based NO production systems.