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arXiv · 2606.21259

Role of the Local Electric-Field in High-Field Conditioning of DC Electrodes:Numerical and Experimental Insights

Victoria Madeleine Bjelland·William Lee Millar·Morten Kildemo·Walter Wuensch
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Abstract

Conditioning, the progressive increase of voltage-holding through the controlled application of fields, is an important and widely used process for bringing high-field and high-voltage devices up to their full operating parameters. Here, a study is presented on how conditioning can vary within a device, specifically, when there is a spatial variation in the surface electric field. What has been observed in high-field pulsed direct-current electrodes and radio-frequency structures is that locations exposed to higher fields exhibit a greater tendency to breakdown, but this increase is counteracted by an increased conditioning rate. This interplay explains the observed breakdown locations and provides important insights into the mechanisms underlying both conditioning and breakdown. This study combines Monte Carlo simulations with experimental results from pairs of high-field electrodes with a radially varying surface electric field. Results are presented from a high-field pulsed DC system, in which the position of each breakdown during conditioning was recorded by triangulation using a pair of cameras, and the results are compared with Monte Carlo simulations.

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Victoria Madeleine Bjelland, William Lee Millar, Morten Kildemo, Walter Wuensch. 2026-06-19. Role of the Local Electric-Field in High-Field Conditioning of DC Electrodes:Numerical and Experimental Insights. https://arxiv.org/abs/2606.21259

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