Measuring the Emission and Decay Time of a Cathode Plasma

Measuring the Emission and Decay Time of a Cathode Plasma

A cathode test stand has been designed to study cathode emission characteristics over pulse lengths of up to 2.5μs. A suite of diagnostics is used to characterize both the initial turn-on of emission and excess emission. One diagnostic amongst the suite is used to monitor the emission directly by im...

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Bibliographic Details
Published in:2023 IEEE International Conference on Plasma Science (ICOPS) p. 1
Main Authors: Howard, M. R., Coleman, J. E., Lidia, S.
Format: Conference Proceeding
Language:English
Published: IEEE 21-05-2023
Subjects:
Current measurement
Hydrogen
Image resolution
Imaging
Plasma measurements
Plasmas
Time measurement
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Summary:A cathode test stand has been designed to study cathode emission characteristics over pulse lengths of up to 2.5μs. A suite of diagnostics is used to characterize both the initial turn-on of emission and excess emission. One diagnostic amongst the suite is used to monitor the emission directly by imaging the cathode face with an ICCD. We measure the lifetime of the hydrogen plasma through time resolved measurements with the ICCD. We have found that the time constant for the cathode decay ranges from 0.5μs to 1μs, In some cases, the emission current rapidly exceeds what is expected due to ChildLangmuir. We also monitor excess emission in the diode with diamond detectors and capacitive pickups. Example measurements will be presented.
ISSN:2576-7208
DOI:10.1109/ICOPS45740.2023.10481033