Effects of an ergodic magnetic limiter on the edge plasma properties of the text tokamak

S. Lippmann; M. Finkenthal; H. W. Moos; S. C. McCool; A. J. Wootton

doi:10.1088/0029-5515/31/11/009

Effects of an ergodic magnetic limiter on the edge plasma properties of the text tokamak

S. Lippmann, M. Finkenthal, H. W. Moos, S. C. McCool, A. J. Wootton

Racah Institute of Physics

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14 Scopus citations

Abstract

Spatially resolved VUV emissions from low-Z intrinsic impurities have been used to measure the effects of an ergodic magnetic limiter (EML) on the edge region of the TEXT plasma. Using previously established techniques for determining the electron density ne and the electron temperature T_e from line pair ratios within the beryllium-like O V ion, poloidal modulations in rig and T_e are found corresponding to EML induced magnetic islands. In general, increases of 50% in both n_e and Te are found near the poloidal locations of X-points and decreases of the same order are found near O-points. Modulations and radial profile broadening of intrinsic carbon and oxygen ions are also found, indicating enhancement of edge impurity transport during EML perturbation.

Original language	English
Pages (from-to)	2131-2140
Number of pages	10
Journal	Nuclear Fusion
Volume	31
Issue number	11
DOIs	https://doi.org/10.1088/0029-5515/31/11/009
State	Published - Nov 1991

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title = "Effects of an ergodic magnetic limiter on the edge plasma properties of the text tokamak",

abstract = "Spatially resolved VUV emissions from low-Z intrinsic impurities have been used to measure the effects of an ergodic magnetic limiter (EML) on the edge region of the TEXT plasma. Using previously established techniques for determining the electron density ne and the electron temperature Te from line pair ratios within the beryllium-like O V ion, poloidal modulations in rig and Te are found corresponding to EML induced magnetic islands. In general, increases of 50% in both ne and Te are found near the poloidal locations of X-points and decreases of the same order are found near O-points. Modulations and radial profile broadening of intrinsic carbon and oxygen ions are also found, indicating enhancement of edge impurity transport during EML perturbation.",

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AU - Finkenthal, M.

AU - Moos, H. W.

AU - McCool, S. C.

AU - Wootton, A. J.

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N2 - Spatially resolved VUV emissions from low-Z intrinsic impurities have been used to measure the effects of an ergodic magnetic limiter (EML) on the edge region of the TEXT plasma. Using previously established techniques for determining the electron density ne and the electron temperature Te from line pair ratios within the beryllium-like O V ion, poloidal modulations in rig and Te are found corresponding to EML induced magnetic islands. In general, increases of 50% in both ne and Te are found near the poloidal locations of X-points and decreases of the same order are found near O-points. Modulations and radial profile broadening of intrinsic carbon and oxygen ions are also found, indicating enhancement of edge impurity transport during EML perturbation.

AB - Spatially resolved VUV emissions from low-Z intrinsic impurities have been used to measure the effects of an ergodic magnetic limiter (EML) on the edge region of the TEXT plasma. Using previously established techniques for determining the electron density ne and the electron temperature Te from line pair ratios within the beryllium-like O V ion, poloidal modulations in rig and Te are found corresponding to EML induced magnetic islands. In general, increases of 50% in both ne and Te are found near the poloidal locations of X-points and decreases of the same order are found near O-points. Modulations and radial profile broadening of intrinsic carbon and oxygen ions are also found, indicating enhancement of edge impurity transport during EML perturbation.

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Effects of an ergodic magnetic limiter on the edge plasma properties of the text tokamak

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