Comment on “Three-dimensional numerical investigation of electron transport with rotating spoke in a cylindrical anode layer Hall plasma accelerator” [Phys. Plasmas 19, 073519 (2012)]

doi:10.1063/1.4773895

Title: Comment on “Three-dimensional numerical investigation of electron transport with rotating spoke in a cylindrical anode layer Hall plasma accelerator” [Phys. Plasmas 19, 073519 (2012)]

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Authors:: Ellison, C. L.; Matyash, K.; Parker, J. B.; Raitses, Y.; Fisch, N. J.

Publication Date:: 2013-01-01

Sponsoring Org.:: USDOE

OSTI Identifier:: 1074858

Grant/Contract Number:: AC02-09CH11466

Resource Type:: Published Article

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Name: Physics of Plasmas Journal Volume: 20 Journal Issue: 1; Journal ID: ISSN 1070-664X

Publisher:: American Institute of Physics

Country of Publication:: United States

Language:: English

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                    Ellison, C. L., Matyash, K., Parker, J. B., Raitses, Y., and Fisch, N. J. Comment on “Three-dimensional numerical investigation of electron transport with rotating spoke in a cylindrical anode layer Hall plasma accelerator” [Phys. Plasmas 19, 073519 (2012)].  United States: N. p., 2013. 
        Web.  doi:10.1063/1.4773895.

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                    Ellison, C. L., Matyash, K., Parker, J. B., Raitses, Y., & Fisch, N. J. Comment on “Three-dimensional numerical investigation of electron transport with rotating spoke in a cylindrical anode layer Hall plasma accelerator” [Phys. Plasmas 19, 073519 (2012)].  United States.  doi:10.1063/1.4773895.

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                    Ellison, C. L., Matyash, K., Parker, J. B., Raitses, Y., and Fisch, N. J. Tue .  
        "Comment on “Three-dimensional numerical investigation of electron transport with rotating spoke in a cylindrical anode layer Hall plasma accelerator” [Phys. Plasmas 19, 073519 (2012)]".  United States.  doi:10.1063/1.4773895.

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@article{osti_1074858,

  title        = {Comment on “Three-dimensional numerical investigation of electron transport with rotating spoke in a cylindrical anode layer Hall plasma accelerator” [Phys. Plasmas 19, 073519 (2012)]},

  author       = {Ellison, C. L. and Matyash, K. and Parker, J. B. and Raitses, Y. and Fisch, N. J.},

  abstractNote = {},

  doi          = {10.1063/1.4773895},

  journal      = {Physics of Plasmas},

  number       = 1,

  volume       = 20,

  place        = {United States},

  year         = {2013},

  month        = {1}

}

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DOI: 10.1063/1.4773895

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Similar Records in DOE PAGES and OSTI.GOV collections:

Comment on 'Three-dimensional numerical investigation of electron transport with rotating spoke in a cylindrical anode layer Hall plasma accelerator'[Phys. Plasmas 19, 073519 (2012)]

Journal Article Ellison, C. L. ; Parker, J. B. ; Raitses, Y. ; ... - Physics of Plasmas

The oscillation behavior described by Tang et al.[Phys. Plasmas 19, 073519 (2012)] differs too greatly from previous experimental and numerical studies to claim observation of the same phenomenon. Most significantly, the rotation velocity by Tang et al.[Phys. Plasmas 19, 073519 (2012)] is three orders of magnitude larger than that of typical 'rotating spoke' phenomena. Several physical and numerical considerations are presented to more accurately understand the numerical results of Tang et al.[Phys. Plasmas 19, 073519 (2012)] in light of previous studies.
DOI: 10.1063/1.4773895
Response to 'Comment on 'Three-dimensional numerical investigation of electron transport with rotating spoke in a cylindrical anode layer Hall plasma accelerator''[Phys. Plasmas 20, 014701 (2013)]

Journal Article Tang, D. L. ; Qiu, X. M. ; Geng, S. F. ; ... - Physics of Plasmas

The numerical simulation described in our paper [D. L. Tang et al., Phys. Plasmas 19, 073519 (2012)] shows a rotating dense plasma structure, which is the critical characteristic of the rotating spoke. The simulated rotating spoke has a frequency of 12.5 MHz with a rotational speed of {approx}1.0 Multiplication-Sign 10{sup 6} m/s on the surface of the anode. Accompanied by the almost uniform azimuthal ion distribution, the non-axisymmetric electron distribution introduces two azimuthal electric fields with opposite directions. The azimuthal electric fields have the same rotational frequency and speed together with the rotating spoke. The azimuthal electric fields excite themore »« less
DOI: 10.1063/1.4773896
Three-dimensional Numerical Investigation of Electron Transport with Rotating Spoke in a Cylindrical Anode Layer Hall Plasma Accelerator

Technical Report Ellison, C. Leland ; Matyash, K. ; Parker, J. B. ; ...

The oscillation behavior described in [Tang et. al, Phys. Plasmas 19, 073519 (2012)] di ers too greatly from previous experimental and numerical studies to claim observation of the same phenomenon. Most signi cantly, the rotation velocity in [Tang et. al, Phys. Plasmas 19, 073519 (2012)] is three orders of magnitude larger than that of typical \rotating spoke" phenomena. Several physical and numerical considerations are presented to more accurately understand the numerical results of [Tang et. al, Phys. Plasmas 19, 073519 (2012)] in light of previous studies.
DOI: 10.2172/1056800

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Three-dimensional numerical investigation of electron transport with rotating spoke in a cylindrical anode layer Hall plasma accelerator

Journal Article Tang, D L ; Geng, S F ; Qiu, X M ; ... - Physics of Plasmas

The effects of increased magnetic field and pressure on electron transport with a rotating spoke in a cylindrical anode layer Hall plasma accelerator are investigated by three-dimensional particle-in-cell numerical simulation. The azimuthal rotation of electron transport with the spoke has a frequency of 12.5 MHz. It propagates in the direction of the E Multiplication-Sign B drift at a speed of {approx}1.0 Multiplication-Sign 10{sup 6} m/s (about 37% of the E Multiplication-Sign B drift speed). Local charge separation occurs because the azimuthal local electron density concentration is accompanied by an almost uniform azimuthal ion distribution. The non-axisymmetrical electron density concentration andmore »« less
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More recently, Roy et al.[Phys. Plasmas 19, 033705 (2012)] have investigated the occurrence of nonlinear solitary and double-layers in an ultrarelativistic dusty electron-positron-ion degenerate plasma using a Sagdeev potential method. They have considered a full parametric examination on Mach-number criteria for existence of such nonlinear excitations using the specific degeneracy limits of Chandrasekhar equation of state (EoS) for Fermi-Dirac plasmas. In this comment, we point-out a misleading extension of polytropic EoS to study the Fermi-Dirac relativistically degenerate plasmas.
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