Thomas Coates

Aerospace and Mechanical Engineering

Faculty Advisor: Sergey Leonov

Probe waveform and nanosecond imaging comparative analysis for volumetric space charge waves

A streamer corona electrical discharge is commonly realized in many practical devices and technologies dealing with a high-voltage electricity. In some cases, such a discharge is intentionally generated, e.g. for surfaces/materials processing, plasma medicine, electronic devices, and others. In many other cases, the corona discharge appears as a parasitic phenomenon, leading to malfunctions and failures. Knowledge of the streamer corona discharge pattern and dynamics is urgently required for development of proper control procedures. Recent studies show that surface electric charge deposited by the high-voltage pulse discharge greatly affects the discharge parameters and morphology. In addition, a similar behavior was found for a volumetric single-pin discharge. This type of discharge produces volumetric electric charge waves concomitant with a redistribution of electric field that significantly influences the discharge pattern. In general, an understanding of the effects of space charge on the discharge characteristics is one of the most important for the study of low-temperature plasmas. However, it has been largely under-explored due to the unavailability of a proper measurement tool. The particular portion of this work includes the visualization of the discharge morphology with a nanosecond resolution by means of an advanced ISSD ANDOR iStar camera. The major objective of this work is to correspond the acquired images to the electric field morphology and the pulse high-voltage generator waveform.