Utilization of outer-midplane collector probes with isotopically enriched tungsten tracer particles for impurity transport studies in the scrape-off layer of DIII-D (invited)

doi:10.1063/1.5039347

Title: Utilization of outer-midplane collector probes with isotopically enriched tungsten tracer particles for impurity transport studies in the scrape-off layer of DIII-D (invited)

Abstract

Triplet sets of replaceable graphite rod collector probes (CPs), each with collection surfaces on opposing faces and oriented normal to the magnetic field, were inserted at the outboard mid-plane of DIII-D to study divertor tungsten (W) transport in the Scrape-Off Layer (SOL). Each CP collects particles along field lines with different parallel sampling lengths (determined by the rod diameters and SOL transport) giving radial profiles from the main wall inward to R-R _sep ~ 6 cm. The CPs were deployed in a first-of-a-kind experiment using two toroidal rings of distinguishable isotopically enriched, W-coated divertor tiles installed at 2 poloidal locations in the divertor. Post-mortem Rutherford backscatter spectrometry of the surface of the CPs provided areal density profiles of elemental W coverage. Higher W content was measured on the probe side facing along the field lines toward the inner target indicating higher concentration of W in the plasma upstream of the CP, even though the W-coated rings were in the outer target region of the divertor. Inductively coupled plasma mass spectroscopy validates the isotopic tracer technique through analysis of CPs exposed during L-mode discharges with the outer strike point on the isotopically enriched W coated-tile ring. The contribution from each divertormore »« less

Authors:

^[1];

^[2]; Stangeby, P. C. ^[3];

^[1];

^[1]; Rudakov, D. L. ^[4];

^[5];

^[2];

^[6];

^[1]; Elder, J. D. ^[3]; Neff, Anton L. ^[2]

Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Toronto, North York, Ontario (Canada)
Univ. of California-San Diego, San Diego, CA (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
General Atomics, San Diego, CA (United States)

Publication Date:: 2018-10-04

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

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

OSTI Identifier:: 1505317

Alternate Identifier(s):: OSTI ID: 1476126

Grant/Contract Number:: AC05-00OR22725; FC02-04ER54698; FG02-07ER54917; NA0003525; SC0016318

Resource Type:: Accepted Manuscript

Journal Name:: Review of Scientific Instruments

Additional Journal Information:: Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats


                    Donovan, David C., Unterberg, Ezekial A., Stangeby, P. C., Zamperini, Shawn A., Auxier, John D., Rudakov, D. L., Wampler, W. R., Zach, Mike P., Abrams, Tyler, Duran, Jonah D., Elder, J. D., and Neff, Anton L. Utilization of outer-midplane collector probes with isotopically enriched tungsten tracer particles for impurity transport studies in the scrape-off layer of DIII-D (invited).  United States: N. p., 2018. 
        Web.  doi:10.1063/1.5039347.

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                    Donovan, David C., Unterberg, Ezekial A., Stangeby, P. C., Zamperini, Shawn A., Auxier, John D., Rudakov, D. L., Wampler, W. R., Zach, Mike P., Abrams, Tyler, Duran, Jonah D., Elder, J. D., & Neff, Anton L. Utilization of outer-midplane collector probes with isotopically enriched tungsten tracer particles for impurity transport studies in the scrape-off layer of DIII-D (invited).  United States.  doi:10.1063/1.5039347.

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                    Donovan, David C., Unterberg, Ezekial A., Stangeby, P. C., Zamperini, Shawn A., Auxier, John D., Rudakov, D. L., Wampler, W. R., Zach, Mike P., Abrams, Tyler, Duran, Jonah D., Elder, J. D., and Neff, Anton L. Thu .  
        "Utilization of outer-midplane collector probes with isotopically enriched tungsten tracer particles for impurity transport studies in the scrape-off layer of DIII-D (invited)".  United States.  doi:10.1063/1.5039347.  https://www.osti.gov/servlets/purl/1505317.

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@article{osti_1505317,

  title        = {Utilization of outer-midplane collector probes with isotopically enriched tungsten tracer particles for impurity transport studies in the scrape-off layer of DIII-D (invited)},

  author       = {Donovan, David C. and Unterberg, Ezekial A. and Stangeby, P. C. and Zamperini, Shawn A. and Auxier, John D. and Rudakov, D. L. and Wampler, W. R. and Zach, Mike P. and Abrams, Tyler and Duran, Jonah D. and Elder, J. D. and Neff, Anton L.},

  abstractNote = {Triplet sets of replaceable graphite rod collector probes (CPs), each with collection surfaces on opposing faces and oriented normal to the magnetic field, were inserted at the outboard mid-plane of DIII-D to study divertor tungsten (W) transport in the Scrape-Off Layer (SOL). Each CP collects particles along field lines with different parallel sampling lengths (determined by the rod diameters and SOL transport) giving radial profiles from the main wall inward to R-Rsep ~ 6 cm. The CPs were deployed in a first-of-a-kind experiment using two toroidal rings of distinguishable isotopically enriched, W-coated divertor tiles installed at 2 poloidal locations in the divertor. Post-mortem Rutherford backscatter spectrometry of the surface of the CPs provided areal density profiles of elemental W coverage. Higher W content was measured on the probe side facing along the field lines toward the inner target indicating higher concentration of W in the plasma upstream of the CP, even though the W-coated rings were in the outer target region of the divertor. Inductively coupled plasma mass spectroscopy validates the isotopic tracer technique through analysis of CPs exposed during L-mode discharges with the outer strike point on the isotopically enriched W coated-tile ring. The contribution from each divertor ring of W to the deposition profiles found on the mid-plane collector probes was able to be de-convoluted using a stable isotope mixing model. Furthermore the results provided quantitative information on the W source and transport from specific poloidal locations within the lower divertor region.},

  doi          = {10.1063/1.5039347},

  journal      = {Review of Scientific Instruments},

  number       = 10,

  volume       = 89,

  place        = {United States},

  year         = {2018},

  month        = {10}

}

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DOI: 10.1063/1.5039347

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Title: Utilization of outer-midplane collector probes with isotopically enriched tungsten tracer particles for impurity transport studies in the scrape-off layer of DIII-D (invited)

Abstract

Citation Formats

A modified acid digestion procedure for extraction of tungsten from soil journal, January 2010

Determination of the tungsten divertor retention at ASDEX Upgrade using a sublimation probe journal, September 2002

Impurity collection in the SOL plasma and at the wall of W7-AS journal, December 1992

Interpretation of plasma impurity deposition probes. Analytic approximation journal, January 1987

Collector Probe Measurements of Impurity Fluxes Injected into the Plasma of the T-10 Tokamak journal, January 1988

Impurity behaviour in the ASDEX Upgrade divertor tokamak with large area tungsten walls journal, May 2002

Measurements of net erosion and redeposition of molybdenum in DIII-D journal, July 2013

Converting isotope values to diet composition: the use of mixing models journal, April 2012

DiMES PMI research at DIII-D in support of ITER and beyond journal, November 2017

Plasma boundary phenomena in tokamaks journal, July 1990

Conclusions about the use of tungsten in the divertor of ASDEX Upgrade journal, March 1999

Divertor and midplane materials evaluation system in DIII-D journal, June 2007

Modelling of impurity flow in the tokamak scrape-off layer journal, January 1984

Metal Stable Isotope Signatures as Tracers in Environmental Geochemistry journal, February 2015

The Design and Use of Tungsten Coated TZM Molybdenum Tile Inserts in the DIII-D Tokamak Divertor journal, August 2017

Erosion and deposition of metals and carbon in the DIII—D divertor journal, October 1996

The tungsten divertor experiment at ASDEX Upgrade journal, December 1996

Proposed plasma edge diagnostics for jet journal, October 1980

Tokamak plasma diagnosis by surface physics techniques journal, September 1978

Plasma interactions with the outboard chamber wall in DIII-D journal, June 2009

Impurity transport in the ASDEX edge plasma studied by a combination of passive and active probes with SIMS analysis journal, November 1982

Collector probe measurements in T-10: Results and prospects journal, April 1989

Impurity retention by divertors. I. One dimensional models journal, November 1995

Deposition results from rotating collector diagnostics in JET journal, December 2009

Probe measurements in the plasma boundary layer journal, November 1982

Discharge resolved impurity flux measurements in the edge plasma of ASDEX Upgrade by exposure of collector probes journal, June 2007

Migration of tungsten eroded from divertor tiles in ASDEX Upgrade journal, February 1997

Overview of the recent DiMES and MiMES experiments in DIII-D journal, December 2009

Analytical characteristics of a commercial ICP orthogonal acceleration time-of-flight mass spectrometer (ICP-TOFMS) journal, January 2000

A modified acid digestion procedure for extraction of tungsten from soil
journal, January 2010

Determination of the tungsten divertor retention at ASDEX Upgrade using a sublimation probe
journal, September 2002

Impurity collection in the SOL plasma and at the wall of W7-AS
journal, December 1992

Interpretation of plasma impurity deposition probes. Analytic approximation
journal, January 1987

Collector Probe Measurements of Impurity Fluxes Injected into the Plasma of the T-10 Tokamak
journal, January 1988

Impurity behaviour in the ASDEX Upgrade divertor tokamak with large area tungsten walls
journal, May 2002

Measurements of net erosion and redeposition of molybdenum in DIII-D
journal, July 2013

Converting isotope values to diet composition: the use of mixing models
journal, April 2012

DiMES PMI research at DIII-D in support of ITER and beyond
journal, November 2017

Plasma boundary phenomena in tokamaks
journal, July 1990

Conclusions about the use of tungsten in the divertor of ASDEX Upgrade
journal, March 1999

Divertor and midplane materials evaluation system in DIII-D
journal, June 2007

Modelling of impurity flow in the tokamak scrape-off layer
journal, January 1984

Metal Stable Isotope Signatures as Tracers in Environmental Geochemistry
journal, February 2015

The Design and Use of Tungsten Coated TZM Molybdenum Tile Inserts in the DIII-D Tokamak Divertor
journal, August 2017

Erosion and deposition of metals and carbon in the DIII—D divertor
journal, October 1996

The tungsten divertor experiment at ASDEX Upgrade
journal, December 1996

Proposed plasma edge diagnostics for jet
journal, October 1980

Tokamak plasma diagnosis by surface physics techniques
journal, September 1978

Plasma interactions with the outboard chamber wall in DIII-D
journal, June 2009

Impurity transport in the ASDEX edge plasma studied by a combination of passive and active probes with SIMS analysis
journal, November 1982

Collector probe measurements in T-10: Results and prospects
journal, April 1989

Impurity retention by divertors. I. One dimensional models
journal, November 1995

Deposition results from rotating collector diagnostics in JET
journal, December 2009

Probe measurements in the plasma boundary layer
journal, November 1982

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