The impedance behaviour of the positive column - a sensitive method to characterize the dynamic properties of a neon glow discharge at different gas-temperatures
- Univ. of Greifswald (Germany)
We present detailed experimental and theoretical studies of the impedance behaviour of a periodically perturbed neon glow discharge. The positive column behaves differently depending on the parameters gas pressure, discharge current, tube radius etc. This parameter space can be divided into striation-free (homogenous) and spontaneous-striation regions. It is known that moving striations can be excited in the positive column of glow discharges with a gas pressure of a few Torr. They are excited by slight deviations of the electron temperature, which cause large ionization fluctuations giving rise to a nonlinear instability with relatively large amplitude. Different types of moving striations are known (p-, r- and s-waves) which differ in the product of wavelength {lambda} and the electric field strength E (Novak-constant). It is assumed, that the metastable atoms are responsible for the appearance of the p-waves, the atomic ions for that of the r-waves and the ions of molecules for that of the s-waves. The investigations usually carried out in the homogeneous region by ascertaining the phase- and amplitude relation between discharge current i and electrical field-strength E as time varying quantities whenever a disturbance {gamma}i is impressed on the discharge current i{sub 0} and only minor disturbances will be permitted.
- OSTI ID:
- 212809
- Report Number(s):
- CONF-950749--
- Country of Publication:
- United States
- Language:
- English
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