Article Dans Une Revue Journal of Physics D: Applied Physics Année : 2025

High-speed imaging of titanium cathode spots in a high-current vacuum arc thruster

Résumé

The apparent movement of plasma emission sites across the cathode surface of a 30 W high-current vacuum arc thruster is examined using high-speed imaging. Images captured at a frame rate of 450 000 fps reveal the temporal evolution of the cathode spot distribution over the course of a single current pulse. Films were recorded with a titanium cathode and a copper anode. A comparison with the discharge current shows a locally high current density, on the order of 10^9 A /m2 . Quantitative analysis on clustering of cathode spots, and the mapping of their trajectory over the cathode surface offer insights into the cathode erosion dynamics.

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hal-04957119 , version 1 (19-02-2025)

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E Michaux, J Julien, S Mazouffre. High-speed imaging of titanium cathode spots in a high-current vacuum arc thruster. Journal of Physics D: Applied Physics, 2025, 58 (13), pp.135206. ⟨10.1088/1361-6463/adafb9⟩. ⟨hal-04957119⟩
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