Measuring the Langmuir Probe Characteristic in a Pure Electron Plasma
Abstract
Electron plasmas of minor radius 4.5 cm, major radius 43 cm and density n≈3×10^6 cm-3 are created in a toroidal magnetic field of strength 196 G. Trapping times on the order of 100 μ s have been obtained and oscillations in trapped plasmas have been observed. A 5-tip insertable probe has been used to measure the floating potential profile in electron plasmas. The electron density is determined from these measurements. Secondary electron emission is observed, indicating the presence of energetic electrons. We will report measurements of the Langmuir probe characteristic (I-V Curve), and extract the plasma temperature from these results. This measurement represents an investigation into the thermal and secondary electron emission modifications to the Child-Langmuir Law for vacuum diodes.
- Publication:
-
APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- October 2001
- Bibcode:
- 2001APS..DPPGP1027S