Fluctuations and stability of plasmas in the H-1NF heliac

J. H. Harris; M. G. Shats; B. D. Blackwell; W. M. Solomon; D. G. Pretty; S. M. Collis; J. Howard; H. Xia; C. A. Michael; H. Punzmann

doi:10.1088/0029-5515/44/2/008

Fluctuations and stability of plasmas in the H-1NF heliac

J. H. Harris, M. G. Shats, B. D. Blackwell, W. M. Solomon, D. G. Pretty, S. M. Collis, J. Howard, H. Xia, C. A. Michael, H. Punzmann

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

17 Scopus citations

Abstract

The H-1NF heliac is a medium-sized heliac stellarator experiment with major radius R = 1m, and average plasma minor radius a = 0.15-0.2m. Its 'flexible-heliac' coil set permits precise variation in the value and shape of the rotational transform (τ) profile, with regions of both positive and negative shear. Operation at low fields (B<0.2T) with argon plasmas heated by helicon waves produces plasmas that have large ion Larmor radii (ρ _i/a ∼0.4) and show confinement transitions at low power like those in the edge of large devices, yielding fundamental measurements concerning electric fields and zonal flows. At a higher field (0.5 T), precise rotational transform scans with H - He plasmas heated by ICRF show resonant equilibrium and stability phenomena which depend on the value of the rotational transform at the radius of zero shear.

Original language	English
Pages (from-to)	279-286
Number of pages	8
Journal	Nuclear Fusion
Volume	44
Issue number	2
DOIs	https://doi.org/10.1088/0029-5515/44/2/008
State	Published - Feb 2004
Externally published	Yes

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title = "Fluctuations and stability of plasmas in the H-1NF heliac",

abstract = "The H-1NF heliac is a medium-sized heliac stellarator experiment with major radius R = 1m, and average plasma minor radius a = 0.15-0.2m. Its 'flexible-heliac' coil set permits precise variation in the value and shape of the rotational transform (τ) profile, with regions of both positive and negative shear. Operation at low fields (B<0.2T) with argon plasmas heated by helicon waves produces plasmas that have large ion Larmor radii (ρ i/a ∼0.4) and show confinement transitions at low power like those in the edge of large devices, yielding fundamental measurements concerning electric fields and zonal flows. At a higher field (0.5 T), precise rotational transform scans with H - He plasmas heated by ICRF show resonant equilibrium and stability phenomena which depend on the value of the rotational transform at the radius of zero shear.",

author = "Harris, {J. H.} and Shats, {M. G.} and Blackwell, {B. D.} and Solomon, {W. M.} and Pretty, {D. G.} and Collis, {S. M.} and J. Howard and H. Xia and Michael, {C. A.} and H. Punzmann",

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AU - Harris, J. H.

AU - Shats, M. G.

AU - Blackwell, B. D.

AU - Solomon, W. M.

AU - Pretty, D. G.

AU - Collis, S. M.

AU - Howard, J.

AU - Xia, H.

AU - Michael, C. A.

AU - Punzmann, H.

PY - 2004/2

Y1 - 2004/2

N2 - The H-1NF heliac is a medium-sized heliac stellarator experiment with major radius R = 1m, and average plasma minor radius a = 0.15-0.2m. Its 'flexible-heliac' coil set permits precise variation in the value and shape of the rotational transform (τ) profile, with regions of both positive and negative shear. Operation at low fields (B<0.2T) with argon plasmas heated by helicon waves produces plasmas that have large ion Larmor radii (ρ i/a ∼0.4) and show confinement transitions at low power like those in the edge of large devices, yielding fundamental measurements concerning electric fields and zonal flows. At a higher field (0.5 T), precise rotational transform scans with H - He plasmas heated by ICRF show resonant equilibrium and stability phenomena which depend on the value of the rotational transform at the radius of zero shear.

AB - The H-1NF heliac is a medium-sized heliac stellarator experiment with major radius R = 1m, and average plasma minor radius a = 0.15-0.2m. Its 'flexible-heliac' coil set permits precise variation in the value and shape of the rotational transform (τ) profile, with regions of both positive and negative shear. Operation at low fields (B<0.2T) with argon plasmas heated by helicon waves produces plasmas that have large ion Larmor radii (ρ i/a ∼0.4) and show confinement transitions at low power like those in the edge of large devices, yielding fundamental measurements concerning electric fields and zonal flows. At a higher field (0.5 T), precise rotational transform scans with H - He plasmas heated by ICRF show resonant equilibrium and stability phenomena which depend on the value of the rotational transform at the radius of zero shear.

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VL - 44

SP - 279

EP - 286

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 2

ER -

Fluctuations and stability of plasmas in the H-1NF heliac

Abstract

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