Constrained ripple optimization of Tokamak bundle divertors

Technical Report · Tue Feb 01 00:00:00 EST 1983

DOI:https://doi.org/10.2172/6758641· OSTI ID:6758641

Hively, L. M.; Rome, J. A.; Lynch, V. E.; Lyon, J. F.; Fowler, R. H.; Peng, Y-K. M.; Dory, R. A.

Magnetic field ripple from a tokamak bundle divertor is localized to a small toroidal sector and must be treated differently from the usual (distributed) toroidal field (TF) coil ripple. Generally, in a tokamak with an unoptimized divertor design, all of the banana-trapped fast ions are quickly lost due to banana drift diffusion or to trapping between the 1/R variation in absolute value vector B ..xi.. B and local field maxima due to the divertor. A computer code has been written to optimize automatically on-axis ripple subject to these constraints, while varying up to nine design parameters. Optimum configurations have low on-axis ripple (<0.2%) so that, now, most banana-trapped fast ions are confined. Only those ions with banana tips near the outside region (absolute value theta < or equal to 45/sup 0/) are lost. However, because finite-sized TF coils have not been used in this study, the flux bundle is not expanded.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6758641
• Report Number(s): ORNL/TM-7898; ON: DE83006363
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BUNDLE DIVERTORS
OPTIMIZATION
TOKAMAK TYPE REACTORS
BANANA REGIME
MAGNETIC FIELD RIPPLES
TRAPPED-PARTICLE INSTABILITY
DIVERTORS
INSTABILITY
MAGNETIC FIELD CONFIGURATIONS
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
THERMONUCLEAR REACTORS
TRAPPING
700202* - Fusion Power Plant Technology- Magnet Coils &amp; Fields