Stable plasma at convex-concave field lines

Summary form only given. Plasma in magnetic field configuration of alternating-sign curvature - with appropriate combination of the convex and concave field line parts, exhibits specific stability features against convective (flute-interchange) modes 1 , 2 . This results in the internally peaked sta...

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Bibliographic Details
Main Authors: Tsventoukh, Mikhail M., Krashevskaya, Galina V., Prishvitsyn, Alexander S.
Format: Conference Proceeding
Language:English
Subjects:
Current measurement
Magnetic confinement
Magnetic field measurement
Plasma measurements
Saturation magnetization
Stability criteria
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Summary:Summary form only given. Plasma in magnetic field configuration of alternating-sign curvature - with appropriate combination of the convex and concave field line parts, exhibits specific stability features against convective (flute-interchange) modes 1 , 2 . This results in the internally peaked stable pressure profiles that has been predicted from theory with taking into account necessary and sufficient `kinetic' criterion of plasma convective stability. Simplest magnetic confinement system that is required for such a peaking - tandem of a mirror and cusp device, having minimum of second adiabatic invariant J = ∫ v dl in a middle of confinement volume. Compact magnetic confinement system Magnetor 3 , 4 with 2.45 ECR plasma has been improved by adding additional current coil to satisfy alternating-sign curvature requirements for a plasma pressure peaking. First experimental measurements of the ion saturation current transverse profiles (see figure 1) demonstrate a maximum in ion saturation current at the region of low but alternating-sign curvature.
ISSN:0730-9244
2576-7208
DOI:10.1109/PLASMA.2015.7179849