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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

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 » 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.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [1]; ORCiD logo [1];  [4]; ORCiD logo [5]; ORCiD logo [2]; ORCiD logo [6]; ORCiD logo [1];  [3];  [2]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Toronto, North York, Ontario (Canada)
  4. Univ. of California-San Diego, San Diego, CA (United States)
  5. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  6. General Atomics, San Diego, CA (United States)
Publication Date:
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.
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.
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.
@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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