Transient behaviour of Langmuir probes in magnetic plasma
Langmuir probes are used to measure plasma fluctuations, which can be influenced by transient effects in the plasma outside the layer. These effects were investigated. The probe indication line as well as indication line and impedance of the flow tube were determined and the measurements were compared to theoretical models. The flow tube can be described as a coaxial cable, in which an Alfvén-wave is expanding. The diffusion coefficient indicates that the charge vehicle flow into the flow tube is supposedly caused by turbulent transport. The influence of the cable impedance is mainly due to the cable capacity. By use of a probe array the fed signals were measured. It was concluded that the signals are damped strongly and that the signal running time corresponds to the estimations (from Alfvén-velocity and connection length). It would be desirable to improve the measurements, but a lot of work would be required.
Bibliographic Reference: Report: IPPIII/224 DE (1997) 77pp.
Availability: Available from the Max-Planck-Institut für Plasmaphysik, 85748 Garching bei München (DE)
Record Number: 199711490 / Last updated on: 1997-12-09
Original language: de
Available languages: de