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In large tokamaks there are problems of spatial resolution when determining the ion temperature profile by passive analysis of the neutral particle flux produced by exchange of the charge. The plasma considerably attenuates the signal from the centre of the discharge where the density of neutral particles is already very low compared to that in the boundary. An active measurement diagnosis of the Ti profile was developed for Tore Supra using six neutral particle analysers facing the beam at various depths of penetration into the plasma. The plane within which they are aimed is at 80 to the toroidal field direction. The plasma is doped with neutral particles by radial injection of a beam of hydrogen atoms at 50 keV. With these spectrometers, hydrogen and deuterium can be analysed simultaneously for energies of between 1 and 300 keV for protons and 150 keV for deutons, by means of a parallel configuration of the electric and magnetic fields. Mass rejection is in the order of 1%. The ion distribution function is described for 48 analysis channels.

Additional information

Authors: FARJON J L, CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR);HUTTER T, CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Paper presented: 2ème Congrès de la Division de Plasma, Orsay (FR), Sept. 3-4, 1990
Availability: Text not available
Record Number: 199011507 / Last updated on: 1994-12-02
Original language: fr
Available languages: fr