New heat flux model for non-axisymmetric divertor infrared structures
Abstract
A convective heat flux model for perturbed plasmas, based on guiding center ion drift in vacuum elds (A. Wingen, et al., Phys. Plasmas 21 (2014) 012509), has been updated. The old model only considered ion heat flux, while here also electron heat flux is included. The updated model predicts divertor heat flux distributions in non-axisymmetric (3D) plasmas with applied Resonant Magnetic Perturbation (RMP) fields, and includes electric scalar potentials. It is found that a radial electric field in the near Scrape-o Layer (SOL) can considerably shift the footprints toroidally, leading to a smearing out eff ect of the incident heat flux, while a simple model for sheath potential has little impact on footprints. Various approaches to model electron heat flux are studied. A convective electron model, based on collisionless free streaming, is found to yield the best agreement with measurements, while a conductive model requires a at temperature gradient inside lobes to yield acceptable peak heat ux values. A heuristic heat flux layer approach, based on a fixed layer width also requires a limited heat flux inside the last closed flux surface (LCFS); by selecting various locations of the LCFS, the results of the conductive or convective model can bemore »
- Authors:
-
[1];
[2];
[3];
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of California, San Diego, CA (United States)
- General Atomics, San Diego, CA (United States); Univ. of California, San Diego, CA (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1714352
- Alternate Identifier(s):
- OSTI ID: 1755328; OSTI ID: 1818659
- Grant/Contract Number:
- FC02-04ER54698; AC02-09CH11466; AC05-00OR22725; FC02-99ER54512; FG02-95ER54309
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 61; Journal Issue: 1; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Wingen, Andreas, Orlov, Dmitri M., Evans, Todd E., Bykov, Igor, and Wilks, Theresa M. New heat flux model for non-axisymmetric divertor infrared structures. United States: N. p., 2020.
Web. doi:10.1088/1741-4326/abbfe9.
Wingen, Andreas, Orlov, Dmitri M., Evans, Todd E., Bykov, Igor, & Wilks, Theresa M. New heat flux model for non-axisymmetric divertor infrared structures. United States. https://doi.org/10.1088/1741-4326/abbfe9
Wingen, Andreas, Orlov, Dmitri M., Evans, Todd E., Bykov, Igor, and Wilks, Theresa M. Thu .
"New heat flux model for non-axisymmetric divertor infrared structures". United States. https://doi.org/10.1088/1741-4326/abbfe9. https://www.osti.gov/servlets/purl/1714352.
@article{osti_1714352,
title = {New heat flux model for non-axisymmetric divertor infrared structures},
author = {Wingen, Andreas and Orlov, Dmitri M. and Evans, Todd E. and Bykov, Igor and Wilks, Theresa M.},
abstractNote = {A convective heat flux model for perturbed plasmas, based on guiding center ion drift in vacuum elds (A. Wingen, et al., Phys. Plasmas 21 (2014) 012509), has been updated. The old model only considered ion heat flux, while here also electron heat flux is included. The updated model predicts divertor heat flux distributions in non-axisymmetric (3D) plasmas with applied Resonant Magnetic Perturbation (RMP) fields, and includes electric scalar potentials. It is found that a radial electric field in the near Scrape-o Layer (SOL) can considerably shift the footprints toroidally, leading to a smearing out eff ect of the incident heat flux, while a simple model for sheath potential has little impact on footprints. Various approaches to model electron heat flux are studied. A convective electron model, based on collisionless free streaming, is found to yield the best agreement with measurements, while a conductive model requires a at temperature gradient inside lobes to yield acceptable peak heat ux values. A heuristic heat flux layer approach, based on a fixed layer width also requires a limited heat flux inside the last closed flux surface (LCFS); by selecting various locations of the LCFS, the results of the conductive or convective model can be recovered respectively. The sum of ion and electron heat fluxes, both obtained by the convective model, is compared to experimental data for multiple time slices in DIII-D. Strike point splitting is observed with peak heat fluxes and layer widths that compare well to infrared camera (IR) measurements.},
doi = {10.1088/1741-4326/abbfe9},
journal = {Nuclear Fusion},
number = 1,
volume = 61,
place = {United States},
year = {Thu Nov 26 00:00:00 EST 2020},
month = {Thu Nov 26 00:00:00 EST 2020}
}
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