By I. H. Hutchinson
This e-book presents a scientific advent to the physics of plasma diagnostics measurements. It develops from first rules the options had to plan, execute and interpret plasma measurements, making it an appropriate publication for graduate scholars and execs with little plasma physics historical past. The e-book may also be a invaluable reference for professional plasma physicists, either experimental and theoretical, in addition to people with an curiosity in area and astrophysical functions. This moment variation is punctiliously revised and up to date, with new sections and chapters masking contemporary advancements within the box.
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Extra info for Principles of Plasma Diagnostics, Second Edition
Sample text
Since the Grad-Shafranov solution depends on the unknown functions p(\p) and F(xp) we clearly require some method of estimating these functions from the external magnetic data. This is normally done by representing the functions in some analytic form with just a few free parameters. Then one determines the combination of parameters and externally produced fields that best fits the magnetic measurements. It turns out that in typical cases, from magnetic measurements alone, one can determine reliably only roughly two parameters of the plasma profile functions.
17. Typical probe insertion geometry. In other types of plasma, for example when B^ ~ BQ, B^ may vary substantially and so be of greater importance. 3 Internal magnetic probe measurements 39 Fig. 18. Poloidal magnetic field evolution measured with internal magnetic probe (Hutchinson 1976b). measurements. The radial component Br provides information on the shift of the plasma (assumed approximately cylindrical) perpendicular to the probe. An important question that arises in all internal probing measurements is: how does the probe perturb the plasma?
It is relatively straightforward to perform the measurement of the m = 1 (and higher) components of the poloidal magnetic field. The earliest such measurements used a kind of Rogowski coil but with an effective winding density that varies like cosmO or sinmO. That gives an output directly proportional to the (time derivative of the) required Fourier component. Today, because large-scale data-acquisition is routine, the more common approach is to use a set of discrete coils ranged around the plasma at different values of 6.