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Title: 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 d 1 = 9/4 and that of the secondary turnstile is d 2 = -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 d 1 = 2 is within the error bar of d 1 = 9/4 estimated here.

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. Hampton Univ., Hampton, VA (United States)
  2. Columbia Univ., New York, NY (United States)
Publication Date:
Research Org.:
Hampton Univ., Hampton, VA (United States); Columbia Univ., New York, NY (United States); Univ. of California, Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
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. doi:10.1063/1.5113907.
Punjabi, Alkesh, and Boozer, Allen H. Thu . "Simulation of non-resonant stellarator divertor". United States. doi:10.1063/1.5113907.
@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 = {2020},
month = {1}
}

Journal Article:
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Works referenced in this record:

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