First evidence of dominant influence of E × B drifts on plasma cooling in an advanced slot divertor for tokamak power exhaust
Abstract
Addressing power exhaust in tokamaks is presently recognized as one of the major remaining open issues for the development of fusion reactors. At the forefront of this endeavor is the effort to develop an advanced divertor by maximizing dissipation of plasma power and momentum inside the divertor. Here, we demonstrate, for the first time, that the electromagnetic (E × B) drifts exert a key influence on plasma and gas dynamics in a new advanced slot divertor in the DIII-D tokamak, named the small angle slot (SAS). SAS leverages the effect of drifts to achieve a highly dissipative divertor with electron temperature Te ≲ 10 eV over a wide range of plasma densities, for ion B × ∇B away from the divertor, as used for advanced tokamak operation on DIII-D. Modeling with the SOLPS-ITER code shows that for this drift direction, the E × B flow carries particles toward the outer common flux region (CFR) via the private flux region (PFR), reinforcing neutral recycling and enhancing divertor dissipation. In contrast, for the opposite field direction, the E × B flow carries particles away from the outer CFR into the PFR, offsetting the anticipated SAS geometric effects. Furthermore, this finding is anmore »
- Authors:
-
[1];
[2];
- Oak Ridge Associated Univ., Oak Ridge, TN (United States)
- General Atomics, San Diego, CA (United States)
- Univ. of Toronto, ON (Canada)
- Univ. of Washington, St. Louis, MO (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1798817
- Grant/Contract Number:
- FC02-04ER54698
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 61; Journal Issue: 5; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; tokamak; advanced divertor; drifts; SOLPS-ITER
Citation Formats
Ma, Xinxing, Wang, Huiqian Q., Guo, Houyang Y., Stangeby, Peter C., Meier, E. T., Shafer, Morgan W., and Thomas, Dan M. First evidence of dominant influence of E × B drifts on plasma cooling in an advanced slot divertor for tokamak power exhaust. United States: N. p., 2021.
Web. doi:10.1088/1741-4326/abde75.
Ma, Xinxing, Wang, Huiqian Q., Guo, Houyang Y., Stangeby, Peter C., Meier, E. T., Shafer, Morgan W., & Thomas, Dan M. First evidence of dominant influence of E × B drifts on plasma cooling in an advanced slot divertor for tokamak power exhaust. United States. https://doi.org/10.1088/1741-4326/abde75
Ma, Xinxing, Wang, Huiqian Q., Guo, Houyang Y., Stangeby, Peter C., Meier, E. T., Shafer, Morgan W., and Thomas, Dan M. Mon .
"First evidence of dominant influence of E × B drifts on plasma cooling in an advanced slot divertor for tokamak power exhaust". United States. https://doi.org/10.1088/1741-4326/abde75. https://www.osti.gov/servlets/purl/1798817.
@article{osti_1798817,
title = {First evidence of dominant influence of E × B drifts on plasma cooling in an advanced slot divertor for tokamak power exhaust},
author = {Ma, Xinxing and Wang, Huiqian Q. and Guo, Houyang Y. and Stangeby, Peter C. and Meier, E. T. and Shafer, Morgan W. and Thomas, Dan M.},
abstractNote = {Addressing power exhaust in tokamaks is presently recognized as one of the major remaining open issues for the development of fusion reactors. At the forefront of this endeavor is the effort to develop an advanced divertor by maximizing dissipation of plasma power and momentum inside the divertor. Here, we demonstrate, for the first time, that the electromagnetic (E × B) drifts exert a key influence on plasma and gas dynamics in a new advanced slot divertor in the DIII-D tokamak, named the small angle slot (SAS). SAS leverages the effect of drifts to achieve a highly dissipative divertor with electron temperature Te ≲ 10 eV over a wide range of plasma densities, for ion B × ∇B away from the divertor, as used for advanced tokamak operation on DIII-D. Modeling with the SOLPS-ITER code shows that for this drift direction, the E × B flow carries particles toward the outer common flux region (CFR) via the private flux region (PFR), reinforcing neutral recycling and enhancing divertor dissipation. In contrast, for the opposite field direction, the E × B flow carries particles away from the outer CFR into the PFR, offsetting the anticipated SAS geometric effects. Furthermore, this finding is an important step in the understanding of the behavior of advanced divertors for achieving a power exhaust solution for fusion reactors.},
doi = {10.1088/1741-4326/abde75},
journal = {Nuclear Fusion},
number = 5,
volume = 61,
place = {United States},
year = {Mon Apr 12 00:00:00 EDT 2021},
month = {Mon Apr 12 00:00:00 EDT 2021}
}
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