Effect of Temperature Gradient on the Characteristic of Langmuir Probe
The effect of a electron temperature gradient on the I-V(b) (electron current-voltage) characteristic of the Langmuir probe is analysed. We find that [d(lnI)/edV(b)](-1) does not simply represent the local electron temperature when the temperature gradient is taken into account. [d(lnI)/edV(b)](-1) obtained from the probe measurements corresponds to an effective temperature, which is approximately the electron temperature a mean free path away from the probe, the electron energy for calculating the mean free path being that of electrons which are able to overcome the probe potential. A method of measuring the electron temperature profile using the probe is suggested.
Bibliographic Reference: Report: JET-P(95)81 EN (1995) 13pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
Record Number: 199610510 / Last updated on: 1996-05-13
Original language: en
Available languages: en