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Title: Study of the impact of resonant magnetic perturbation fields on gross tungsten erosion using DiMES samples in DIII-D

Abstract

Here, an experiment was conducted in DIII-D to compare gross tungsten (W) erosion on samples exposed to outer strike point (OSP) sweeps in L-mode plasmas for three conditions. These included two phases of resonant magnetic perturbations (RMPs), and a set with no perturbations. Upon RMP application, lobe structures indicative of strike point splitting of the OSP were evident in divertor camera data and on Langmuir probes. Gross W erosion flux, $${{\rm{\Gamma }}}_{{\rm{W}}},$$ inferred spectroscopically using the S/XB method applied to the 400.9 nm W-I line, was generally in the range $${{\rm{\Gamma }}}_{{\rm{W}}}/{{\rm{\Gamma }}}_{{\rm{D}}+,\perp }=2\times {10}^{-4}$$ referenced to incident deuterium ion flux $${{\rm{\Gamma }}}_{{\rm{D}}+,\perp },$$ and was increased in the RMP cases by no more than 30% of the level observed in unperturbed discharges. A large reduction in gross erosion (50%) was observed in the private flux region at the W sample for one specific toroidal phase of the RMP field.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4]; ORCiD logo [3];  [5];  [5];  [6]
  1. Univ. of Wisconsin, Madison, WI (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of California, San Diego, CA (United States)
  5. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  6. Oak Ridge Associated Univ., Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Laboratories, San Diego, CA
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1477318
Report Number(s):
SAND2018-10785J
Journal ID: ISSN 0031-8949; 668321
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physica Scripta
Additional Journal Information:
Journal Volume: T170; Journal ID: ISSN 0031-8949
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Hinson, E. T., Schmitz, O., Frerichs, H., Abrams, T., Briesemeister, A., Rudakov, D. L., Unterberg, E. A., Wampler, W. R., Watkins, J. G., and Wang, H. Q. Study of the impact of resonant magnetic perturbation fields on gross tungsten erosion using DiMES samples in DIII-D. United States: N. p., 2017. Web. doi:10.1088/1402-4896/aa9002.
Hinson, E. T., Schmitz, O., Frerichs, H., Abrams, T., Briesemeister, A., Rudakov, D. L., Unterberg, E. A., Wampler, W. R., Watkins, J. G., & Wang, H. Q. Study of the impact of resonant magnetic perturbation fields on gross tungsten erosion using DiMES samples in DIII-D. United States. doi:10.1088/1402-4896/aa9002.
Hinson, E. T., Schmitz, O., Frerichs, H., Abrams, T., Briesemeister, A., Rudakov, D. L., Unterberg, E. A., Wampler, W. R., Watkins, J. G., and Wang, H. Q. Fri . "Study of the impact of resonant magnetic perturbation fields on gross tungsten erosion using DiMES samples in DIII-D". United States. doi:10.1088/1402-4896/aa9002. https://www.osti.gov/servlets/purl/1477318.
@article{osti_1477318,
title = {Study of the impact of resonant magnetic perturbation fields on gross tungsten erosion using DiMES samples in DIII-D},
author = {Hinson, E. T. and Schmitz, O. and Frerichs, H. and Abrams, T. and Briesemeister, A. and Rudakov, D. L. and Unterberg, E. A. and Wampler, W. R. and Watkins, J. G. and Wang, H. Q.},
abstractNote = {Here, an experiment was conducted in DIII-D to compare gross tungsten (W) erosion on samples exposed to outer strike point (OSP) sweeps in L-mode plasmas for three conditions. These included two phases of resonant magnetic perturbations (RMPs), and a set with no perturbations. Upon RMP application, lobe structures indicative of strike point splitting of the OSP were evident in divertor camera data and on Langmuir probes. Gross W erosion flux, ${{\rm{\Gamma }}}_{{\rm{W}}},$ inferred spectroscopically using the S/XB method applied to the 400.9 nm W-I line, was generally in the range ${{\rm{\Gamma }}}_{{\rm{W}}}/{{\rm{\Gamma }}}_{{\rm{D}}+,\perp }=2\times {10}^{-4}$ referenced to incident deuterium ion flux ${{\rm{\Gamma }}}_{{\rm{D}}+,\perp },$ and was increased in the RMP cases by no more than 30% of the level observed in unperturbed discharges. A large reduction in gross erosion (50%) was observed in the private flux region at the W sample for one specific toroidal phase of the RMP field.},
doi = {10.1088/1402-4896/aa9002},
journal = {Physica Scripta},
issn = {0031-8949},
number = ,
volume = T170,
place = {United States},
year = {2017},
month = {10}
}

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