DEVELOPMENT OF METHODS FOR QUANTITATIVE SPECTROSCOPIC TEMPERATURE DETERMINATION OF PLASMAS
Final technical rept.
KIEL UNIV (GERMANY F R)
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During the last two years at Kiel institute three ways were followed to obtain plasmas with temperatures up to 100,000 K. The first approach pulsing an arc by high current was not as successful as desired because confinement breaks down. The second experiment was a linear pinch. In the center of the discharge temperatures higher than 80,000 K could be measured, the radiation being emitted from thermally excited atoms. The third way is the magnetic compression of a pre-ionized discharge in helium by an outer magnetic field. Pre-ionization was effected by used of a pulsed discharge fed by a capacitor bank. Plasma parameters were determined using quantitative spectroscopic methods. Distributions of plasma parameters in space and time could be investigated by time-resolved spectroscopy. Temperature was found to be 70,000 K at most. Several methods to determine plasma parameters yielded the same results, thus proving the plasma to be in local thermodynamic equilibrium. Radia tion was found to be emitted from optically thin layers.
- Plasma Physics and Magnetohydrodynamics