Observations of a mode transition in a hydrogen hollow cathode discharge using phase resolved optical emission spectroscopy

Sam Dixon; Christine Charles; James Dedrick; Timo Gans; Deborah O'Connell; Rod Boswell

doi:10.1063/1.4889916

Observations of a mode transition in a hydrogen hollow cathode discharge using phase resolved optical emission spectroscopy

Sam Dixon^*, Christine Charles, James Dedrick, Timo Gans, Deborah O'Connell, Rod Boswell

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

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 emission from the discharge. The low emission mode is consistent with a typical 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.

Original language	English
Article number	014104
Journal	Applied Physics Letters
Volume	105
Issue number	1
DOIs	https://doi.org/10.1063/1.4889916
Publication status	Published - 7 Jul 2014

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title = "Observations of a mode transition in a hydrogen hollow cathode discharge using phase resolved optical emission spectroscopy",

abstract = "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 emission from the discharge. The low emission mode is consistent with a typical 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.",

author = "Sam Dixon and Christine Charles and James Dedrick and Timo Gans and Deborah O'Connell and Rod Boswell",

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AU - Dixon, Sam

AU - Charles, Christine

AU - Dedrick, James

AU - Gans, Timo

AU - O'Connell, Deborah

AU - Boswell, Rod

PY - 2014/7/7

Y1 - 2014/7/7

N2 - 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 emission from the discharge. The low emission mode is consistent with a typical 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.

AB - 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 emission from the discharge. The low emission mode is consistent with a typical 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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DO - 10.1063/1.4889916

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VL - 105

JO - Applied Physics Letters

JF - Applied Physics Letters

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M1 - 014104

ER -

Observations of a mode transition in a hydrogen hollow cathode discharge using phase resolved optical emission spectroscopy

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