Examination of the physical and spectrochemical conditions of the arc discharge under inert gas pressure up to 40 atmospheres (in German)
Technical Report
·
OSTI ID:4934903
Examinations with a dc arc at high pressure showed that the discharge in a he1ium atmosphere, compared to argon, is accompanied by convection-effected instabilities. They occur at pressure > 20 atm He, and in analytic work, they are responsible for an insufficient consistency of the spectrochemical results. A considerable improvenient of the reproducibility can be obtained by installing a homogeneous, longitudinal magnetic field, since at field intensities between 100 and 200 G a stabilization of of the arc discharge occurs. Under these conditions it is possible to perform a quantitative, spectrochemical analysis in a helium atmosphere up to 40 atm. The higher ionization potential of helium, compared to argon, causes a higher arc-operating voltage and a greater electric field intensity in the discharge space. The greater field intensity results in a strong acceleration of the charged particles in the near-electrode regions and, for the case of the helium-high-pressure arc, leads to erosion figures at the cathode and anode. Plasma-diagnostic, spectroscopic measurements on a helium arc showed a linear relation between discharge pressure and arc temperature or electron pressure in the pressure range from 10 to 40 atm. The helium high- pressure arc has a small discharge channel in which temperature and electron density have a strong radial decreasing. It was possible to demonstrate this clearly by interference-optical exposures. (auth)
- Research Organization:
- Kernforschungsanlage Juelich G.m.b.H. (F.R. Germany). Inst. fuer Reaktorwerkstoffe
- Sponsoring Organization:
- Sponsor not identified
- NSA Number:
- NSA-29-009145
- OSTI ID:
- 4934903
- Report Number(s):
- JUL--973-RW
- Country of Publication:
- Germany
- Language:
- German
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