[formula omitted] optimization of small aspect ratio stellarator/tokamak hybrid devices

D. A. Spong; S. P. Hirshman; J. C. Whitson; D. B. Batchelor; B. A. Carreras; V. E. Lynch; J. A. Rome

doi:10.1063/1.872844

[formula omitted] optimization of small aspect ratio stellarator/tokamak hybrid devices

D. A. Spong, S. P. Hirshman, J. C. Whitson, D. B. Batchelor, B. A. Carreras, V. E. Lynch, J. A. Rome

Plasma Theory and Modeling

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

Abstract

A new class of low aspect ratio toroidal hybrid stellarators is found using a more general plasma confinement optimization criterion than quasisymmetrization. The plasma current profile and shape of the outer magnetic flux surface are used as control variables to achieve near constancy of the longitudinal invariant [formula omitted] on internal flux surfaces (quasiomnigeneity), in addition to a number of other desirable physics target properties. A range of compact (small aspect ratio [formula omitted]), low plasma current devices have been found with significantly improved confinement, both for thermal as well as energetic (collisionless) particle components. With reasonable increases in magnetic field and geometric size, such devices can also be scaled to confine 3.5 MeV alpha particle orbits.

Original language	English
Pages (from-to)	1752-1758
Number of pages	7
Journal	Physics of Plasmas
Volume	5
Issue number	5
DOIs	https://doi.org/10.1063/1.872844
State	Published - May 1998

Keywords

DESIGN
MAGNETIC FIELDS
OPTIMIZATION
PLASMA CONFINEMENT
STELLARATORS
TOKAMAK DEVICES

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1063/1.872844

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title = "[formula omitted] optimization of small aspect ratio stellarator/tokamak hybrid devices",

abstract = "A new class of low aspect ratio toroidal hybrid stellarators is found using a more general plasma confinement optimization criterion than quasisymmetrization. The plasma current profile and shape of the outer magnetic flux surface are used as control variables to achieve near constancy of the longitudinal invariant [formula omitted] on internal flux surfaces (quasiomnigeneity), in addition to a number of other desirable physics target properties. A range of compact (small aspect ratio [formula omitted]), low plasma current devices have been found with significantly improved confinement, both for thermal as well as energetic (collisionless) particle components. With reasonable increases in magnetic field and geometric size, such devices can also be scaled to confine 3.5 MeV alpha particle orbits.",

keywords = "DESIGN, MAGNETIC FIELDS, OPTIMIZATION, PLASMA CONFINEMENT, STELLARATORS, TOKAMAK DEVICES",

author = "Spong, {D. A.} and Hirshman, {S. P.} and Whitson, {J. C.} and Batchelor, {D. B.} and Carreras, {B. A.} and Lynch, {V. E.} and Rome, {J. A.}",

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T1 - [formula omitted] optimization of small aspect ratio stellarator/tokamak hybrid devices

AU - Spong, D. A.

AU - Hirshman, S. P.

AU - Whitson, J. C.

AU - Batchelor, D. B.

AU - Carreras, B. A.

AU - Lynch, V. E.

AU - Rome, J. A.

PY - 1998/5

Y1 - 1998/5

N2 - A new class of low aspect ratio toroidal hybrid stellarators is found using a more general plasma confinement optimization criterion than quasisymmetrization. The plasma current profile and shape of the outer magnetic flux surface are used as control variables to achieve near constancy of the longitudinal invariant [formula omitted] on internal flux surfaces (quasiomnigeneity), in addition to a number of other desirable physics target properties. A range of compact (small aspect ratio [formula omitted]), low plasma current devices have been found with significantly improved confinement, both for thermal as well as energetic (collisionless) particle components. With reasonable increases in magnetic field and geometric size, such devices can also be scaled to confine 3.5 MeV alpha particle orbits.

AB - A new class of low aspect ratio toroidal hybrid stellarators is found using a more general plasma confinement optimization criterion than quasisymmetrization. The plasma current profile and shape of the outer magnetic flux surface are used as control variables to achieve near constancy of the longitudinal invariant [formula omitted] on internal flux surfaces (quasiomnigeneity), in addition to a number of other desirable physics target properties. A range of compact (small aspect ratio [formula omitted]), low plasma current devices have been found with significantly improved confinement, both for thermal as well as energetic (collisionless) particle components. With reasonable increases in magnetic field and geometric size, such devices can also be scaled to confine 3.5 MeV alpha particle orbits.

KW - DESIGN

KW - MAGNETIC FIELDS

KW - OPTIMIZATION

KW - PLASMA CONFINEMENT

KW - STELLARATORS

KW - TOKAMAK DEVICES

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DO - 10.1063/1.872844

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JO - Physics of Plasmas

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ER -

[formula omitted] optimization of small aspect ratio stellarator/tokamak hybrid devices

Abstract

Keywords

UN SDGs

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