Potential Profile Measurements Inside a Gridded Cathode at High Potential in a Spherical Inertial Electrostatic Confinement Device

This paper proposes a Langmuir probe-based diagnostics for plasma parameters inside gridded cathodes at high bias potentials in inertial electrostatic confinement devices. As the first step for the proof of concept, floating potential profiles were measured in deuterium and helium plasmas in a glow-...

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Bibliographic Details
Published in:Fusion science and technology 2019-10, Vol.75 (7), p.608-613
Main Authors: Masuda, Kai, Kashima, Ryosuke, Bakr, Mahmoud A.
Format: Article
Language:English
Subjects:
Inertial electrostatic confinement
Langmuir probe
virtual anode
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Summary:This paper proposes a Langmuir probe-based diagnostics for plasma parameters inside gridded cathodes at high bias potentials in inertial electrostatic confinement devices. As the first step for the proof of concept, floating potential profiles were measured in deuterium and helium plasmas in a glow-discharge mode. The measurements with fusion-relevant cathode voltages up to 55 kV were carried out successfully. The results revealed that the positive potential buildup at the center ranges from 5% to 8% of the applied bias voltage to the gridded cathode, which is found to be much smaller than those in earlier works under cathode voltages lower than 5 kV. It was also shown that the floating potential profile is different significantly between deuterium and helium discharge plasmas.
ISSN:1536-1055
1943-7641
DOI:10.1080/15361055.2019.1610292