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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. https://doi.org/10.1063/1.5042666
Boozer, Allen H., and Punjabi, Alkesh. Wed . "Simulation of stellarator divertors". United States. https://doi.org/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 = {Wed Sep 19 00:00:00 EDT 2018},
month = {Wed Sep 19 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 9 works
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Works referenced in this record:

Effect of magnetic perturbations on divertor scrape-off width
journal, January 1978

  • Boozer, Allen H.; Rechester, A. B.
  • Physics of Fluids, Vol. 21, Issue 4
  • DOI: 10.1063/1.862277

Use of nonaxisymmetric shaping in magnetic fusion
journal, May 2009


Loss of relativistic electrons when magnetic surfaces are broken
journal, October 2016

  • Boozer, Allen H.; Punjabi, Alkesh
  • Physics of Plasmas, Vol. 23, Issue 10
  • DOI: 10.1063/1.4966046

Transport in Hamiltonian systems
journal, August 1984


Physics of magnetically confined plasmas
journal, January 2005


Runaway electrons and ITER
journal, March 2017


Free-boundary ideal MHD stability of W7-X divertor equilibria
journal, June 2016


Thirty years of turnstiles and transport
journal, September 2015

  • Meiss, J. D.
  • Chaos: An Interdisciplinary Journal of Nonlinear Science, Vol. 25, Issue 9
  • DOI: 10.1063/1.4915831

Stellarator design
journal, December 2015


Quasi-helically symmetric toroidal stellarators
journal, May 1988


HSX as an example of a resilient non-resonant divertor
journal, March 2017

  • Bader, A.; Boozer, A. H.; Hegna, C. C.
  • Physics of Plasmas, Vol. 24, Issue 3
  • DOI: 10.1063/1.4978494

Physics of the compact advanced stellarator NCSX
journal, November 2001


The Divertor, a Device for Reducing the Impurity Level in a Stellarator
journal, January 1958

  • Burnett, C. R.; Grove, D. J.; Palladino, R. W.
  • Physics of Fluids, Vol. 1, Issue 5
  • DOI: 10.1063/1.1724361

Physics optimization of stellarators
journal, March 1992

  • Grieger, G.; Lotz, W.; Merkel, P.
  • Physics of Fluids B: Plasma Physics, Vol. 4, Issue 7
  • DOI: 10.1063/1.860481

Runaway electrons and ITER
text, January 2017


Thirty Years of Turnstiles and Transport
text, January 2015


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


Simulation of non-resonant stellarator divertor
text, January 2021