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

^*Corresponding author for this work

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

17 Citations (Scopus)

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
Publication status	Published - Feb 2004

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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",

year = "2004",

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doi = "10.1088/0029-5515/44/2/008",

language = "English",

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journal = "Nuclear Fusion",

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T1 - Fluctuations and stability of plasmas in the H-1NF heliac

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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U2 - 10.1088/0029-5515/44/2/008

DO - 10.1088/0029-5515/44/2/008

M3 - Article

SN - 0029-5515

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

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