Plasma flow measurements in the Prototype-Material Plasma Exposure eXperiment (Proto-MPEX) and comparison with B2.5-Eirene modeling

Kafle, Nischal; Owen, Larry W.; Caneses Marin, Juan; Biewer, Theodore M.; Caughman, John B. O.; Donovan, David C.; Goulding, Richard H.; Rapp, Juergen; Showers, Melissa A.

doi:10.1063/1.5019266

Title: Plasma flow measurements in the Prototype-Material Plasma Exposure eXperiment (Proto-MPEX) and comparison with B2.5-Eirene modeling

Abstract

The Prototype Material Plasma Exposure eXperiment (Proto-MPEX) at Oak Ridge National Laboratory is a linear plasma device that combines a helicon plasma source with additional microwave and radio frequency heating to deliver high plasma heat and particle fluxes to a target. Double Langmuir probes and Thomson scattering are being used to measure local electron temperature and density at various radial and axial locations. A recently constructed Mach-double probe provides the added capability of simultaneously measuring electron temperatures (T_e), electron densities (n_e), and Mach numbers (M). With this diagnostic, it is possible to infer the plasma flow, particle flux, and heat flux at different locations along the plasma column in Proto-MPEX. Preliminary results show Mach numbers of 0.5 (towards the dump plate) and 1.0 (towards the target plate) downstream from the helicon source, and a stagnation point (no flow) near the source for the case where the peak magnetic field was 1.3 T. Measurements of particle flow and n_e and T_e profiles are discussed. Finally, the extensive coverage provided by these diagnostics permits data-constrained B2.5-Eirene modeling of the entire plasma column, and comparison with results of modeling in the high-density helicon plasmas will be presented.

Authors:

^[1];

^[2];

^[2]; Donovan, David C. ^[1];

^[2];

^[2]; Showers, Melissa A. ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:: Fri May 25 00:00:00 EDT 2018

Research Org.:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1607311

Alternate Identifier(s):: OSTI ID: 1439133

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Volume: 25; Journal Issue: 5; Journal ID: ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats


                    Kafle, Nischal, Owen, Larry W., Caneses Marin, Juan, Biewer, Theodore M., Caughman, John B. O., Donovan, David C., Goulding, Richard H., Rapp, Juergen, and Showers, Melissa A. Plasma flow measurements in the Prototype-Material Plasma Exposure eXperiment (Proto-MPEX) and comparison with B2.5-Eirene modeling.  United States: N. p., 2018. 
Web.  doi:10.1063/1.5019266.

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                    Kafle, Nischal, Owen, Larry W., Caneses Marin, Juan, Biewer, Theodore M., Caughman, John B. O., Donovan, David C., Goulding, Richard H., Rapp, Juergen, & Showers, Melissa A. Plasma flow measurements in the Prototype-Material Plasma Exposure eXperiment (Proto-MPEX) and comparison with B2.5-Eirene modeling.  United States.  https://doi.org/10.1063/1.5019266

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                    Kafle, Nischal, Owen, Larry W., Caneses Marin, Juan, Biewer, Theodore M., Caughman, John B. O., Donovan, David C., Goulding, Richard H., Rapp, Juergen, and Showers, Melissa A. Fri .  
"Plasma flow measurements in the Prototype-Material Plasma Exposure eXperiment (Proto-MPEX) and comparison with B2.5-Eirene modeling".  United States.  https://doi.org/10.1063/1.5019266.  https://www.osti.gov/servlets/purl/1607311.

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@article{osti_1607311,

  title        = {Plasma flow measurements in the Prototype-Material Plasma Exposure eXperiment (Proto-MPEX) and comparison with B2.5-Eirene modeling},

  author       = {Kafle, Nischal and Owen, Larry W. and Caneses Marin, Juan and Biewer, Theodore M. and Caughman, John B. O. and Donovan, David C. and Goulding, Richard H. and Rapp, Juergen and Showers, Melissa A.},

  abstractNote = {The Prototype Material Plasma Exposure eXperiment (Proto-MPEX) at Oak Ridge National Laboratory is a linear plasma device that combines a helicon plasma source with additional microwave and radio frequency heating to deliver high plasma heat and particle fluxes to a target. Double Langmuir probes and Thomson scattering are being used to measure local electron temperature and density at various radial and axial locations. A recently constructed Mach-double probe provides the added capability of simultaneously measuring electron temperatures (Te), electron densities (ne), and Mach numbers (M). With this diagnostic, it is possible to infer the plasma flow, particle flux, and heat flux at different locations along the plasma column in Proto-MPEX. Preliminary results show Mach numbers of 0.5 (towards the dump plate) and 1.0 (towards the target plate) downstream from the helicon source, and a stagnation point (no flow) near the source for the case where the peak magnetic field was 1.3 T. Measurements of particle flow and ne and Te profiles are discussed. Finally, the extensive coverage provided by these diagnostics permits data-constrained B2.5-Eirene modeling of the entire plasma column, and comparison with results of modeling in the high-density helicon plasmas will be presented.},

  doi          = {10.1063/1.5019266},

  journal      = {Physics of Plasmas},

  number       = 5,

  volume       = 25,

  place        = {United States},

  year         = {Fri May 25 00:00:00 EDT 2018},

  month        = {Fri May 25 00:00:00 EDT 2018}

}

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Overestimation of Mach number due to probe shadow
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Works referencing / citing this record:

Radial transport modeling of high density deuterium plasmas in proto-MPEX with the B2.5-Eirene code
journal, April 2019

Rapp, J.; Owen, L. W.; Canik, J.
Physics of Plasmas, Vol. 26, Issue 4
DOI: 10.1063/1.5049808

Dual-pass upgrade to the Thomson scattering diagnostic on the Prototype-Material Plasma Exposure eXperiment (Proto-MPEX)
journal, October 2018

Kafle, N.; Biewer, T. M.; Donovan, D. C.
Review of Scientific Instruments, Vol. 89, Issue 10
DOI: 10.1063/1.5039370

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Title: Plasma flow measurements in the Prototype-Material Plasma Exposure eXperiment (Proto-MPEX) and comparison with B2.5-Eirene modeling

Abstract

Citation Formats

A Floating Double Probe Method for Measurements in Gas Discharges journal, October 1950

Kinetic theory of ion collection by probing objects in flowing strongly magnetized plasmas journal, November 1988

Developing the science and technology for the Material Plasma Exposure eXperiment journal, July 2017

Mach probes journal, November 2012

The Challenges of Plasma Material Interactions in Nuclear Fusion Devices and Potential Solutions journal, June 2017

B2.5-Eunomia simulations of Pilot-PSI plasmas journal, July 2013

Spectral survey of helium lines in a linear plasma device for use in HELIOS imaging journal, August 2016

Two-dimensional imaging of a helicon discharge journal, November 1997

Analysis of uncompensated Langmuir probe characteristics in radio-frequency discharges revisited journal, January 2006

Helicon antenna radiation patterns in a high-density hydrogen linear plasma device journal, November 2017

The EIRENE and B2-EIRENE Codes journal, February 2005

Transport modeling of convection dominated helicon discharges in Proto-MPEX with the B2.5-Eirene code journal, November 2017

Experimental tests of Langmuir probe theory for strong magnetic fields journal, December 1990

Code development for ITER edge modelling – SOLPS5.1 journal, June 2009

B2.5-Eirene modeling of radial transport in the MAGPIE linear plasma device journal, March 2017

Transport simulations of linear plasma generators with the B2.5-Eirene and EMC3-Eirene codes journal, August 2015

Progress in the Development of a High Power Helicon Plasma Source for the Materials Plasma Exposure Experiment journal, August 2017

B2-EIRENE simulation of plasma and neutrals in MAGNUM-PSI journal, June 2007

Heat flux estimates of power balance on Proto-MPEX with IR imaging journal, August 2016

Initial implementation of a Thomson scattering diagnostic for Proto-MPEX journal, November 2014

Overestimation of Mach number due to probe shadow journal, July 2016

Plasma Modelling for the PSI Linear Plasma Device journal, July 2004

Anomalous Diffusion in a Linear Plasma Generator journal, December 2007

Plasma detachment in linear devices journal, February 2017

The Development of Plasma-Material Interaction Facilities for the Future of Fusion Technology journal, August 2013

First results from the Thomson scattering diagnostic on proto-MPEX journal, August 2016

RF compensation of double Langmuir probes: modelling and experiment journal, May 2015

Plasma source development for fusion-relevant material testing journal, May 2017

Plasma Edge Physics with B2-Eirene journal, February 2006

Radial transport modeling of high density deuterium plasmas in proto-MPEX with the B2.5-Eirene code journal, April 2019

Dual-pass upgrade to the Thomson scattering diagnostic on the Prototype-Material Plasma Exposure eXperiment (Proto-MPEX) journal, October 2018

A Floating Double Probe Method for Measurements in Gas Discharges
journal, October 1950

Kinetic theory of ion collection by probing objects in flowing strongly magnetized plasmas
journal, November 1988

Developing the science and technology for the Material Plasma Exposure eXperiment
journal, July 2017

Mach probes
journal, November 2012

The Challenges of Plasma Material Interactions in Nuclear Fusion Devices and Potential Solutions
journal, June 2017

B2.5-Eunomia simulations of Pilot-PSI plasmas
journal, July 2013

Spectral survey of helium lines in a linear plasma device for use in HELIOS imaging
journal, August 2016

Two-dimensional imaging of a helicon discharge
journal, November 1997

Analysis of uncompensated Langmuir probe characteristics in radio-frequency discharges revisited
journal, January 2006

Helicon antenna radiation patterns in a high-density hydrogen linear plasma device
journal, November 2017

The EIRENE and B2-EIRENE Codes
journal, February 2005

Transport modeling of convection dominated helicon discharges in Proto-MPEX with the B2.5-Eirene code
journal, November 2017

Experimental tests of Langmuir probe theory for strong magnetic fields
journal, December 1990

Code development for ITER edge modelling – SOLPS5.1
journal, June 2009

B2.5-Eirene modeling of radial transport in the MAGPIE linear plasma device
journal, March 2017

Transport simulations of linear plasma generators with the B2.5-Eirene and EMC3-Eirene codes
journal, August 2015

Progress in the Development of a High Power Helicon Plasma Source for the Materials Plasma Exposure Experiment
journal, August 2017

B2-EIRENE simulation of plasma and neutrals in MAGNUM-PSI
journal, June 2007

Heat flux estimates of power balance on Proto-MPEX with IR imaging
journal, August 2016

Initial implementation of a Thomson scattering diagnostic for Proto-MPEX
journal, November 2014

Overestimation of Mach number due to probe shadow
journal, July 2016

Plasma Modelling for the PSI Linear Plasma Device
journal, July 2004

Anomalous Diffusion in a Linear Plasma Generator
journal, December 2007

Plasma detachment in linear devices
journal, February 2017

The Development of Plasma-Material Interaction Facilities for the Future of Fusion Technology
journal, August 2013

First results from the Thomson scattering diagnostic on proto-MPEX
journal, August 2016

RF compensation of double Langmuir probes: modelling and experiment
journal, May 2015

Plasma source development for fusion-relevant material testing
journal, May 2017

Plasma Edge Physics with B2-Eirene
journal, February 2006

Radial transport modeling of high density deuterium plasmas in proto-MPEX with the B2.5-Eirene code
journal, April 2019

Dual-pass upgrade to the Thomson scattering diagnostic on the Prototype-Material Plasma Exposure eXperiment (Proto-MPEX)
journal, October 2018