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William & Mary
[PAST EVENT] Plasma Seminar
September 23, 2015
1pm - 2pm
Abstract:
The interaction of tokamak plasmas with different distributions of externally driven, non-axisymmetric magnetic fields arises in studies of plasma control, stability, and error field mitigation. The number of distinct non-axisymmetric magnetic field perturbations that can interact in important ways is more than an order of magnitude larger than the number of axisymmetric fields and requires systematic analysis to be tractable. Maxwell's equations limit the nature of the interaction and provide a method of systematic analysis in terms of matrix vectors of magnetic fluxes and currents. Only two matrices are required that depend on plasma physics, the plasma inductance and the plasma sensitivity.
Both can be calculated using existing codes. Other matrices, mutual inductances and the self-inductance of a surface can be calculated using the Biot-Savart law or the magnetic dipole equation. Applications to stability, plasma diagnostics using external magnetic measurements, ELM control , and error field mitigation will be discussed.
The interaction of tokamak plasmas with different distributions of externally driven, non-axisymmetric magnetic fields arises in studies of plasma control, stability, and error field mitigation. The number of distinct non-axisymmetric magnetic field perturbations that can interact in important ways is more than an order of magnitude larger than the number of axisymmetric fields and requires systematic analysis to be tractable. Maxwell's equations limit the nature of the interaction and provide a method of systematic analysis in terms of matrix vectors of magnetic fluxes and currents. Only two matrices are required that depend on plasma physics, the plasma inductance and the plasma sensitivity.
Both can be calculated using existing codes. Other matrices, mutual inductances and the self-inductance of a surface can be calculated using the Biot-Savart law or the magnetic dipole equation. Applications to stability, plasma diagnostics using external magnetic measurements, ELM control , and error field mitigation will be discussed.