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

Physics

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

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 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.

Original language	English
Article number	014104
Number of pages	4
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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10.1063/1.4889916

http://scitation.aip.org/content/aip/journal/apl/105/1/10.1063/1.4889916

Cite this

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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 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.",

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

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doi = "10.1063/1.4889916",

language = "English",

volume = "105",

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publisher = "American Institute of Physics",

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T1 - Observations of a mode transition in a hydrogen hollow cathode discharge using phase resolved optical emission spectroscopy

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 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.

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 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.

U2 - 10.1063/1.4889916

DO - 10.1063/1.4889916

M3 - Article

SN - 0003-6951

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JO - Applied Physics Letters

JF - Applied Physics Letters

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ER -