By E. Sindoni
Read Online or Download Diagnostics for Fusion Experiments. Proceedings of the Course, Varenna, Italy, 4–16 September 1978 PDF
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Extra info for Diagnostics for Fusion Experiments. Proceedings of the Course, Varenna, Italy, 4–16 September 1978
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.