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Title: Transport of tungsten to collector probes in DIII-D

Abstract

Collector probes have long been used to measure impurity fluxes in the scrape off layer (SOL) of tokamaks. In this study, collector probes were inserted in the main SOL of DIII-D during the tungsten Metal Rings Campaign, and the W deposits on the probes were analyzed ex situ using Rutherford backscattering spectrometry analysis to obtain radial profiles of W deposition. A simple picture is hypothesized for how the W transports through the SOL from the target to the two sides of the probe, based on a long-theorized impurity accumulation at the crown (i.e. the top) of the plasma. The patterns observed in the deposition profiles along the probes support the hypothesized picture; however, 3D modeling and further experimental studies are needed to support more definitive conclusions.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [2];  [3];  [1]; ORCiD logo [1]; ORCiD logo [3];  [2];  [4]; ORCiD logo [2]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Toronto Institute for Aerospace Studies (UTIAS), Toronto, ON (Canada)
  4. Univ. of California, San Diego (UCSD), San Diego, CA (United State)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1530109
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Materials and Energy
Additional Journal Information:
Journal Volume: 18; Journal Issue: C; Journal ID: ISSN 2352-1791
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

Citation Formats

Zamperini, Shawn A., Donovan, David C., Unterberg, Ezekial, Stangeby, Peter, Nichols, Jacob H., Duran, Jonah D., Elder, D., Neff, Anton, Rudakov, D. L., and Zach, Mike. Transport of tungsten to collector probes in DIII-D. United States: N. p., 2018. Web. doi:10.1016/j.nme.2018.12.013.
Zamperini, Shawn A., Donovan, David C., Unterberg, Ezekial, Stangeby, Peter, Nichols, Jacob H., Duran, Jonah D., Elder, D., Neff, Anton, Rudakov, D. L., & Zach, Mike. Transport of tungsten to collector probes in DIII-D. United States. doi:10.1016/j.nme.2018.12.013.
Zamperini, Shawn A., Donovan, David C., Unterberg, Ezekial, Stangeby, Peter, Nichols, Jacob H., Duran, Jonah D., Elder, D., Neff, Anton, Rudakov, D. L., and Zach, Mike. Thu . "Transport of tungsten to collector probes in DIII-D". United States. doi:10.1016/j.nme.2018.12.013. https://www.osti.gov/servlets/purl/1530109.
@article{osti_1530109,
title = {Transport of tungsten to collector probes in DIII-D},
author = {Zamperini, Shawn A. and Donovan, David C. and Unterberg, Ezekial and Stangeby, Peter and Nichols, Jacob H. and Duran, Jonah D. and Elder, D. and Neff, Anton and Rudakov, D. L. and Zach, Mike},
abstractNote = {Collector probes have long been used to measure impurity fluxes in the scrape off layer (SOL) of tokamaks. In this study, collector probes were inserted in the main SOL of DIII-D during the tungsten Metal Rings Campaign, and the W deposits on the probes were analyzed ex situ using Rutherford backscattering spectrometry analysis to obtain radial profiles of W deposition. A simple picture is hypothesized for how the W transports through the SOL from the target to the two sides of the probe, based on a long-theorized impurity accumulation at the crown (i.e. the top) of the plasma. The patterns observed in the deposition profiles along the probes support the hypothesized picture; however, 3D modeling and further experimental studies are needed to support more definitive conclusions.},
doi = {10.1016/j.nme.2018.12.013},
journal = {Nuclear Materials and Energy},
number = C,
volume = 18,
place = {United States},
year = {2018},
month = {12}
}

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Figures / Tables:

Figure 1 Figure 1: Poloidal cross-section of DIII-D and an image of the collector probe assembly showing the insertion location.

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.