Method of measuring the dc electric field and other tokamak parameters
AssigneeThe United States of America as represented by the United States Department of Energy
InventorsNathaniel J. Fisch, Arnold H. Kirtz
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Abstract
A method including externally imposing an impulsive momentum-space flux to perturb hot tokamak electrons thereby producing a transient synchrotron radiation signal, in frequency-time space, and the inference, using very fast algorithms, of plasma parameters including the effective ion charge state Z.sub.eff, the direction of the magnetic field, and the position and width in velocity space of the impulsive momentum-space flux, and, in particular, the dc toroidal electric field.
Claims11
A method for inferring a plasma parameter of a tokamak plasma, including:
- externally imposing an impulsive momentum-space flux to perturb hot tokamak electrons thereby producing an incremental synchrotron radiation signal,
- measurement of the frequency-time space pattern of said incremental synchrotron radiation using an array of frequency detectors with submillisecond time resolution, and, inference from said pattern of a plasma parameter which governs said radiation.
A method for inferring a plasma parameter of a tokamak plasma, including:
- imposition of an impulsive momentum-space flux to perturb superthermal electrons in said tokamak plasma thereby producing an increment in synchrotron emission,
- measurement of frequency and time of said increment in synchrotron emission, and,
- inference from said measurement of one of the group of plasma parameters consisting of the effective ion charge state Z.sub.eff, the direction of the magnetic field, the position and width in velocity space of the impulsive momentum-space flux, and the dc toroidal electric field.
Dependencies are inferred from the claim text.