Boyle, G.J., D'Arcy, R., Garland, J. M., Loisch, G., Mewes, M., Osterhoff, J., and Thévenet, M. (2022) Long-term evolution of conditions within plasma capillary discharge devices, with application to plasma accelerators. In: [Presented at the 48th EPS Conference on Plasma Physics]. From: 48th EPS Conference on Plasma Physics, 27 June - 1 July 2022, Online.

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Abstract

This work represents the first long-term (µs+) simulations of capillary discharge devices, made feasible by the computationally inexpensive QUEST algorithm [4]. We have demonstrated that QUEST gives comparable results to full plasma fluid simulations both during and long after the discharge has terminated. Using QUEST, the heat flow through the plasma-wall interface was simulated for discharge current conditions relevant to the FLASHForward experiment [2], operated at kHz-MHz repetition rates. The model showed that 1 kHz and 10 kHz repetition rates could be sustained indefinitely, but that 100 kHz and MHz rates quickly exceeded the sapphire capillary melting point. By reducing the pulse length and amplitude, MHz repetition rates can feasibly be sustained while providing plasma conditions suitable for accelerator applications.

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