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A method has been developed for determining the q-profile in elongated tokamaks, based on measurements of poloidal flux, poloidal magnetic field, plasma diamagnetism, poloidal field coil currents, vacuum vessel currents, line-integrated electron density and Faraday rotation angle. The algorithm computes source functions (p' and ff') and solves the Grad-Shafranov equation in such a way as to produce the best fit to the measurements. The method has been tested on a large variety of elongated tokamak equilibria. Assuming realistic errors in the measurements, it is found that the q-profile, and in particular, the value of q on axis, can be determined with an accuracy of typically 4%.

Additional information

Authors: HOFMANN F, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Federale de Lausanne (CH)
Bibliographic Reference: Paper presented: 30th Annual Meeting, Division of Plasma Physics, organised by the American Physical Society, Hollywood (US), Oct. 31-Nov.4, 1988 Article: Bulletin of the American Physical Society, Vol. 33 (1988) No. 9
Availability: Available from (1) as Paper EN 34088 ORA
Record Number: 198910200 / Last updated on: 1994-12-01
Original language: en
Available languages: en