Correlation Between MHD-Activity, Energetic Particle Behaviour and Anomalous Transport Phenomena in WENDELSTEIN 7-AS

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Energy and particle transport in W7-AS exhibits a resonance like dependence on the edge rotational transform (iota) as long as the magnetic shear is relatively weak (low beta, no significant net toroidal currents). MHD modes at resonant surfaces may cause enhanced radial transport depending on the magnitude and radial extent of the magnetic perturbations. In many cases discharges in W7-AS are very quiescent, or in case of mode activity, often no influence on energy and particle confinement is found. In the high beta regime ((beta) </= 1.8 %) shear is increased due to the effect of the Shafranov shift leading … continued below

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Weller, A.; Anton, M.; Geiger, J.; Goerner, C.; Jaenicke, R.; Konrad, C. et al. December 31, 1997.

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Energy and particle transport in W7-AS exhibits a resonance like dependence on the edge rotational transform (iota) as long as the magnetic shear is relatively weak (low beta, no significant net toroidal currents). MHD modes at resonant surfaces may cause enhanced radial transport depending on the magnitude and radial extent of the magnetic perturbations. In many cases discharges in W7-AS are very quiescent, or in case of mode activity, often no influence on energy and particle confinement is found. In the high beta regime ((beta) </= 1.8 %) shear is increased due to the effect of the Shafranov shift leading to the formation of rational surfaces inside the plasma. Pressure driven mode activity appears at corresponding resonant surfaces. These modes could be resistive interchange instabilities since the respective stability criterion can be violated at least in the outer part of the plasma. Only around the highest beta values and in cases, where the magnetic well of the configuration was reduced, relaxations of the plasma energy are observed, indicating the vicinity of a soft beta limit. In most cases, however, the maximum achievable beta is determined by the available heating power.

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INIS; OSTI as DE98000128

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  • 24. EPS conference on controlled fusion and plasma physics, Berchtesgaden (Germany), 9-13 Jun 1997

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  • Other: DE98000128
  • Report No.: CONF-9706131--21
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 629310
  • Archival Resource Key: ark:/67531/metadc696304

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  • December 31, 1997

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Weller, A.; Anton, M.; Geiger, J.; Goerner, C.; Jaenicke, R.; Konrad, C. et al. Correlation Between MHD-Activity, Energetic Particle Behaviour and Anomalous Transport Phenomena in WENDELSTEIN 7-AS, article, December 31, 1997; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc696304/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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