Two distinct operational modes are observed in a radio frequency (rf) low pressure hydrogen hollow cathode discharge. The mode transition is characterised by a change in total light emission and differing expansion structures. An intensified CCD camera is used to make phase resolved images of Balmer α emission from the discharge. The low emission mode is consistent with a typical γ discharge, and appears to be driven by secondary electrons ejected from the cathode surface. The bright mode displays characteristics common to an inductive discharge, including increased optical emission, power factor, and temperature of the H2 gas. The bright mode precipitates the formation of a stationary shock in the expansion, observed as a dark region adjacent to the source-chamber interface.
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7 July 2014
Research Article|
July 09 2014
Observations of a mode transition in a hydrogen hollow cathode discharge using phase resolved optical emission spectroscopy
Sam Dixon;
Sam Dixon
a)
1Space Plasma, Power and Propulsion Laboratory, Research School of Physics and Engineering,
The Australian National University
, Canberra ACT 0200, Australia
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Christine Charles;
Christine Charles
1Space Plasma, Power and Propulsion Laboratory, Research School of Physics and Engineering,
The Australian National University
, Canberra ACT 0200, Australia
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James Dedrick;
James Dedrick
1Space Plasma, Power and Propulsion Laboratory, Research School of Physics and Engineering,
The Australian National University
, Canberra ACT 0200, Australia
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Timo Gans;
Timo Gans
2Department of Physics,
York Plasma Institute
, University of York, Heslington, York YO10 5DD, United Kingdom
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Deborah O'Connell;
Deborah O'Connell
2Department of Physics,
York Plasma Institute
, University of York, Heslington, York YO10 5DD, United Kingdom
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Rod Boswell
Rod Boswell
1Space Plasma, Power and Propulsion Laboratory, Research School of Physics and Engineering,
The Australian National University
, Canberra ACT 0200, Australia
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Sam Dixon
1,a)
Christine Charles
1
James Dedrick
1
Timo Gans
2
Deborah O'Connell
2
Rod Boswell
1
1Space Plasma, Power and Propulsion Laboratory, Research School of Physics and Engineering,
The Australian National University
, Canberra ACT 0200, Australia
2Department of Physics,
York Plasma Institute
, University of York, Heslington, York YO10 5DD, United Kingdom
Appl. Phys. Lett. 105, 014104 (2014)
Article history
Received:
May 09 2014
Accepted:
June 30 2014
Citation
Sam Dixon, Christine Charles, James Dedrick, Timo Gans, Deborah O'Connell, Rod Boswell; Observations of a mode transition in a hydrogen hollow cathode discharge using phase resolved optical emission spectroscopy. Appl. Phys. Lett. 7 July 2014; 105 (1): 014104. https://doi.org/10.1063/1.4889916
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