EXCITATION OF MAGNETOACOUSTIC WAVES IN A PLASMA (in German)
Longitudinal hydromagnetic (magnetoacoustic) waves can be excited in an argon plasma, which is generated and heated by a critically damped discharge of a condenser basic parallel to an external, pulsed magnetic field. Two probes reaching into the plasma from opposite sides contain the emitter and receiver coil, respectively. In order to excite the waves, a small and fast capacitor is discharged through the emitter coil about 70 mu sec after the heating current has dropped to zero, when the plasma is in a quiescent state in thermal equilibrium. Phase velocities and damping coefficients for different magnetic field strengths and different plasma densities were measured. The theory of plasma waves was extended and applied to the particular plasiaa conditions of the experiments. The theory fits the experimental data remarkably well. From the measured phase velocities for vanishing magnetic field strength the plasma temperature can be found and the phase velocities at higher magnetic field strengths allow to determine the degree of ionization. In the experiments temperatures of 14,000 deg K and about 16 per cent ionization were found. (auth)
- Research Organization:
- Universitat, Freiburg i. B.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-18-009483
- OSTI ID:
- 4087327
- Journal Information:
- J. Nucl. Energy, Pt. C, Journal Name: J. Nucl. Energy, Pt. C Vol. Vol: 5
- Country of Publication:
- Country unknown/Code not available
- Language:
- German
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