Diamond-Coated Plasma Probes for Hot and Hazardous Plasmas.

Plasma probes are simple and inexpensive diagnostic tools for fast measurements of relevant plasma parameters. While in earlier times being employed mainly in relatively cold laboratory plasmas, plasma probes are now routinely used even in toroidal magnetic fusion experiments, albeit only in the edge region, i.e.

Laser-heated emissive plasma probe.

Emissive probes are standard tools in laboratory plasmas for the direct determination of the plasma potential. Usually they consist of a loop of refractory wire heated by an electric current until sufficient electron emission. Recently emissive probes were used also for measuring the radial fluctuation-induced particle flux and other essential parameters of edge turbulence in magnetized toroidal hot plasmas [R.

Properties and control of anode double layer oscillations and related phenomena.

An experimental investigation is presented on oscillations excited by the dynamics of an anode double layer or fireball in a double plasma (DP) machine. The fireball is created by additional ionization processes in front of a small circular anode, which is inserted into the diffusive DP plasma and biased positively. An annular (ring) electrode, usually biased negatively, surrounds the anode.