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Title: Simulation of stellarator divertors

Abstract

The nested magnetic surfaces that confine a fusion plasma can be developed to be bounded by a limiter or a divertor. For a limiter, confining surfaces extend until they intercept a part of the surrounding structure. For a divertor, an outermost confining magnetic surface exists, which is well separated from the surrounding structures. The only designs that are thought to be fusion relevant have divertors that direct field lines from the plasma edge into chambers where the particle exhaust can be pumped and the residual heat exhaust can be handled. The topological properties of magnetic field lines just outside the outermost confining surface determine much of the physics of divertors. Axisymmetric tokamak divertors are well-known, and the outermost confining surface is defined by a sharp separatrix. The topology of the magnetic field lines associated with a stellarator divertor is far more subtle. Related subtleties arise in tokamak divertors when subjected to sufficiently strong non-axisymmetric perturbations.Here, an efficient simulation method for carrying out topological studies of non-axisymmetric divertors is created and illustrative results are given.

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. Columbia Univ., New York, NY (United States)
  2. Hampton Univ., Hampton, VA (United States)
Publication Date:
Research Org.:
Hampton Univ., Hampton, VA (United States); Univ. of California, Oakland, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1540242
Alternate Identifier(s):
OSTI ID: 1471440
Grant/Contract Number:  
FG02-01ER54624; FG02-04ER54793; AC02-05CH11231; FG02-95ER5433
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 9; 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

Citation Formats

Boozer, Allen H., and Punjabi, Alkesh. Simulation of stellarator divertors. United States: N. p., 2018. Web. doi:10.1063/1.5042666.
Boozer, Allen H., & Punjabi, Alkesh. Simulation of stellarator divertors. United States. doi:10.1063/1.5042666.
Boozer, Allen H., and Punjabi, Alkesh. Wed . "Simulation of stellarator divertors". United States. doi:10.1063/1.5042666. https://www.osti.gov/servlets/purl/1540242.
@article{osti_1540242,
title = {Simulation of stellarator divertors},
author = {Boozer, Allen H. and Punjabi, Alkesh},
abstractNote = {The nested magnetic surfaces that confine a fusion plasma can be developed to be bounded by a limiter or a divertor. For a limiter, confining surfaces extend until they intercept a part of the surrounding structure. For a divertor, an outermost confining magnetic surface exists, which is well separated from the surrounding structures. The only designs that are thought to be fusion relevant have divertors that direct field lines from the plasma edge into chambers where the particle exhaust can be pumped and the residual heat exhaust can be handled. The topological properties of magnetic field lines just outside the outermost confining surface determine much of the physics of divertors. Axisymmetric tokamak divertors are well-known, and the outermost confining surface is defined by a sharp separatrix. The topology of the magnetic field lines associated with a stellarator divertor is far more subtle. Related subtleties arise in tokamak divertors when subjected to sufficiently strong non-axisymmetric perturbations.Here, an efficient simulation method for carrying out topological studies of non-axisymmetric divertors is created and illustrative results are given.},
doi = {10.1063/1.5042666},
journal = {Physics of Plasmas},
number = 9,
volume = 25,
place = {United States},
year = {2018},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 1 work
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Works referenced in this record:

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    Works referencing / citing this record:

    Simulation of non-resonant stellarator divertor
    journal, January 2020

    • Punjabi, Alkesh; Boozer, Allen H.
    • Physics of Plasmas, Vol. 27, Issue 1
    • DOI: 10.1063/1.5113907

    Direct measurements of counter-streaming flows in a low-shear stellarator magnetic island topology
    journal, September 2019