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By E. Sindoni

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Extra info for Diagnostics for Fusion Experiments. Proceedings of the Course, Varenna, Italy, 4–16 September 1978

Sample text

5] . Data analysis has relied up to now on the assumption the ion distribution function be Maxwellian. In present day Tokamaks however, both heat and parti­ cle transport within the plasma and energy deposition to the ion population (for example, neutral injection heating) have rates comparable to the ion-ion coupling rate. Those processes, in particular when the power level is of the order of or greater than the ohmic power, can then produce distortions on the ion dis­ tribution lasting long enough to be relevant to temperature measurement.

Plasma input Losses Stream pass-through Pulsed start-up guns Neutral beams Stabilizing stream Fig. 4 Fraction not trapped (includes nH ex — portion) ( Coulomb scatt. loss Charge exchange loss Conceptual plasma and energy input into typical mirror confinement experiment. 54 Table I. ) Plug nD density(cm"3) Microwave / n d l Thomson scattering Neutral beam attenuation ¥i ion energy(keV) Fast atom analyzer T e electron Temp. ( volts) (near ω01·) Electrostatic probes Microwave scattering Fluctuating end losses ητ (cnp3)s Combination plasma diamag.

The first of these was to take advantage of the fact that a deuterium neutral beam contains 5 momenta specie which are D° at E, D° at E/2, D° at E/3, D« at E and D« at 2E/3, the latter arising from partially dissociated D~. The second advantage was a feature of the ATC tokamak which allowed the plasma to be moved electromagnetically on a time scale of msec rather than having to mechanically move the scanning analyzer. The technique of plasma scanning is illustrated schematically in Fig. 8 where the beam is represented by the 1 x 3 cm rectangle on the right and the analyzer sight line by the circular dot to the left.

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