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Recent Progress in MHD Stability Calculations of Compact Stellarators.


DE2001768647

Publication Date 2000
Personal Author Fu, G. Y.; Redi, M. H.; Kessel, C.; Monticello, D. A.; Ku, L. P.
Page Count 12
Abstract A key issue for compact stellarators is the stability of beta-limiting MHD modes, such as external kink modes driven by bootstrap current and pressure gradient. We report here recent progress in MHD stability studies for low-aspect-ratio Quasi-Axisymmetric Stellarators (QAS) and Quasi- Omnigeneous Stellarators (QOS). We find that the N = 0 periodicity-preserving vertical mode is significantly more stable in stellarators than in tokamaks because of the externally generated rotational transform. It is shown that both low-n external kink modes and high-n ballooning modes can be stabilized at high beta by appropriate 3D shaping without a conducting wall. The stabilization mechanism for external kink modes in QAS appears to be an enhancement of local magnetic shear due to 3D shaping. The stabilization of ballooning mode in QOS is related to a shortening of the normal curvature connection length.
Keywords
  • Stellarators
  • Vertical modes
  • External kink modes
  • Ballooning modes
  • Calculations
  • Quasi-axisymmetric stellarators(QAS)
  • Quasi-omnigeneous stellarators(QOS)
  • MHD stability
  • NCSX configuration
Source Agency
  • Technical Information Center Oak Ridge Tennessee
Corporate Authors Princeton Univ., NJ. Plasma Physics Lab.; Oak Ridge National Lab., TN.
Supplemental Notes Prepared in cooperation with Oak Ridge National Lab., TN.
Document Type Technical Report
NTIS Issue Number 200122
Recent Progress in MHD Stability Calculations of Compact Stellarators.
Recent Progress in MHD Stability Calculations of Compact Stellarators.
DE2001768647

  • Stellarators
  • Vertical modes
  • External kink modes
  • Ballooning modes
  • Calculations
  • Quasi-axisymmetric stellarators(QAS)
  • Quasi-omnigeneous stellarators(QOS)
  • MHD stability
  • NCSX configuration
  • Technical Information Center Oak Ridge Tennessee
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