Normal and abnormal evolution of argon metastable density in high-density plasmas

Seo, B. H.

doi:10.1063/1.4921213

Title: Normal and abnormal evolution of argon metastable density in high-density plasmas

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Abstract

A controversial problem on the evolution of Ar metastable density as a function of electron density (increasing trend versus decreasing trend) was resolved by discovering the anomalous evolution of the argon metastable density with increasing electron density (discharge power), including both trends of the metastable density [Daltrini et al., Appl. Phys. Lett. 92, 061504 (2008)]. Later, by virtue of an adequate physical explanation based on a simple global model, both evolutions of the metastable density were comprehensively understood as part of the abnormal evolution occurring at low- and high-density regimes, respectively, and thus the physics behind the metastable evolution has seemed to be clearly disclosed. In this study, however, a remarkable result for the metastable density behavior with increasing electron density was observed: even in the same electron density regime, there are both normal and abnormal evolutions of metastable-state density with electron density depending on the measurement position: The metastable density increases with increasing electron density at a position far from the inductively coupled plasma antenna but decreases at a position close to the antenna. The effect of electron temperature, which is spatially nonuniform in the plasma, on the electron population and depopulation processes of Argon metastable atoms with increasingmore »« less

Authors:: Seo, B. H.

Publication Date:: Fri May 15 00:00:00 EDT 2015

OSTI Identifier:: 22410354

Resource Type:: Journal Article

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Volume: 22; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANTENNAS; ARGON; ELECTRON DENSITY; ELECTRON TEMPERATURE; METASTABLE STATES; PLASMA DENSITY

Citation Formats


                    Seo, B. H., Kim, J. H., E-mail: jhkim86@kriss.re.kr, and You, S. J., E-mail: sjyou@cnu.ac.kr. Normal and abnormal evolution of argon metastable density in high-density plasmas.  United States: N. p., 2015. 
        Web.  doi:10.1063/1.4921213.

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                    Seo, B. H., Kim, J. H., E-mail: jhkim86@kriss.re.kr, & You, S. J., E-mail: sjyou@cnu.ac.kr. Normal and abnormal evolution of argon metastable density in high-density plasmas.  United States.  https://doi.org/10.1063/1.4921213

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                    Seo, B. H., Kim, J. H., E-mail: jhkim86@kriss.re.kr, and You, S. J., E-mail: sjyou@cnu.ac.kr. 2015.  
        "Normal and abnormal evolution of argon metastable density in high-density plasmas".  United States.  https://doi.org/10.1063/1.4921213.

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@article{osti_22410354,

  title        = {Normal and abnormal evolution of argon metastable density in high-density plasmas},

  author       = {Seo, B. H. and Kim, J. H., E-mail: jhkim86@kriss.re.kr and You, S. J., E-mail: sjyou@cnu.ac.kr},

  abstractNote = {A controversial problem on the evolution of Ar metastable density as a function of electron density (increasing trend versus decreasing trend) was resolved by discovering the anomalous evolution of the argon metastable density with increasing electron density (discharge power), including both trends of the metastable density [Daltrini et al., Appl. Phys. Lett. 92, 061504 (2008)]. Later, by virtue of an adequate physical explanation based on a simple global model, both evolutions of the metastable density were comprehensively understood as part of the abnormal evolution occurring at low- and high-density regimes, respectively, and thus the physics behind the metastable evolution has seemed to be clearly disclosed. In this study, however, a remarkable result for the metastable density behavior with increasing electron density was observed: even in the same electron density regime, there are both normal and abnormal evolutions of metastable-state density with electron density depending on the measurement position: The metastable density increases with increasing electron density at a position far from the inductively coupled plasma antenna but decreases at a position close to the antenna. The effect of electron temperature, which is spatially nonuniform in the plasma, on the electron population and depopulation processes of Argon metastable atoms with increasing electron density is a clue to understanding the results. The calculated results of the global model, including multistep ionization for the argon metastable state and measured electron temperature, are in a good agreement with the experimental results.},

  doi          = {10.1063/1.4921213},

  url          = {https://www.osti.gov/biblio/22410354},
  journal      = {Physics of Plasmas},

  issn         = {1070-664X},

  number       = 5,

  volume       = 22,

  place        = {United States},

  year         = {Fri May 15 00:00:00 EDT 2015},

  month        = {Fri May 15 00:00:00 EDT 2015}

}

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