The Langmuir probe is a measurement probe used for plasma diagnostics in tokamak fusion reactors and other plasma states. Plasma diagnostics measure the plasma's electron density, electron temperature, and potential.
The Langmuir probe method involves connecting a four-quadrant bipolar power supply to a Langmuir probe in the plasma, applying a sine wave or triangular wave voltage, and analyzing the swept voltage and current to determine the plasma state.
The specifications of the bipolar power supply required for plasma measurements depend on the electron temperature, electron density, and potential of the plasma.
Typically, a four-quadrant power supply with a voltage of ±100V, a current of 1-2A, and a frequency of about 100Hz is used. Some of them, such as high-voltage amplifiers ( AMJ series) with a voltage of ±4000 V, may be used.
Langmuir probes are essential for tokamak fusion and are used for EEDF (Electron energy distribution function) measurements in the vacuum vessel.
- Related words
-
- Plasma
- Vacuum Plasma Treatment
- Nuclear fusion
- Fusion power generation
- Tokamak
- Plasma actuator
- Biconic cusp
- EEDF
- vacuum vessel
