Simulation of non-resonant stellarator divertor
Abstract
An efficient numerical method of studying nonresonant stellarator divertors was introduced in Boozer and Punjabi [Phys. Plasmas 25, 092505 (2018)]. This method is used in this paper to study a different magnetic field model of a nonresonant divertor. The most novel and interesting finding of this study is that diffusive magnetic field lines can be distinguished from lines that exit through the primary and the secondary turnstile, and that below some diffusive velocity, all lines exit through only the primary turnstile. The footprints of each family are stellarator symmetric and have a fixed location on the wall for all velocities. The probability exponent of the primary turnstile is d1 = 9/4 and that of the secondary turnstile is d2 = -3/2. This study also addresses the issues of an inadequate separation of the chamber walls from the outermost confining magnetic surface and a marginal step size of the numerical integrations that could compromise the interpretation of the earlier results [Boozer and Punjabi, Phys. Plasmas 25, 092505 (2018)]. The previous value of d1 = 2 is within the error bar of d1 = 9/4 estimated here.
- Authors:
-
[1];
[2]
- Hampton Univ., Hampton, VA (United States)
- Columbia Univ., New York, NY (United States)
- Publication Date:
- Research Org.:
- Hampton Univ., Hampton, VA (United States); Columbia Univ., New York, NY (United States); University of California, Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1595840
- Alternate Identifier(s):
- OSTI ID: 1581014
- Grant/Contract Number:
- SC0020107; FG02-03ER54696; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 27; Journal Issue: 1; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Stellarator; divertor; nonresonant; magnetic turnstile
Citation Formats
Punjabi, Alkesh, and Boozer, Allen H. Simulation of non-resonant stellarator divertor. United States: N. p., 2020.
Web. doi:10.1063/1.5113907.
Punjabi, Alkesh, & Boozer, Allen H. Simulation of non-resonant stellarator divertor. United States. https://doi.org/10.1063/1.5113907
Punjabi, Alkesh, and Boozer, Allen H. Thu .
"Simulation of non-resonant stellarator divertor". United States. https://doi.org/10.1063/1.5113907. https://www.osti.gov/servlets/purl/1595840.
@article{osti_1595840,
title = {Simulation of non-resonant stellarator divertor},
author = {Punjabi, Alkesh and Boozer, Allen H.},
abstractNote = {An efficient numerical method of studying nonresonant stellarator divertors was introduced in Boozer and Punjabi [Phys. Plasmas 25, 092505 (2018)]. This method is used in this paper to study a different magnetic field model of a nonresonant divertor. The most novel and interesting finding of this study is that diffusive magnetic field lines can be distinguished from lines that exit through the primary and the secondary turnstile, and that below some diffusive velocity, all lines exit through only the primary turnstile. The footprints of each family are stellarator symmetric and have a fixed location on the wall for all velocities. The probability exponent of the primary turnstile is d1 = 9/4 and that of the secondary turnstile is d2 = -3/2. This study also addresses the issues of an inadequate separation of the chamber walls from the outermost confining magnetic surface and a marginal step size of the numerical integrations that could compromise the interpretation of the earlier results [Boozer and Punjabi, Phys. Plasmas 25, 092505 (2018)]. The previous value of d1 = 2 is within the error bar of d1 = 9/4 estimated here.},
doi = {10.1063/1.5113907},
journal = {Physics of Plasmas},
number = 1,
volume = 27,
place = {United States},
year = {Thu Jan 02 00:00:00 EST 2020},
month = {Thu Jan 02 00:00:00 EST 2020}
}
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