How to measure electron temperature, density, or potential of a plasma?

A common diagnostic for measuring plasma parameters is the Langmuir Probe. Electrodes are inserted into a plasma, allowing us to determine plasma properties like electron temperature, electron density, and electron potential.

Langmuir Probes are exposed to high power loads from the plasma and must be made of appropriate materials to avoid damage. They also need to made of materials appropriate for Ultra High Vacuum environments.

If you're thinking about a Langmuir Probe for your application, send an email to our engineers. We'll happily answer any questions you might have. We can build single probes, double probes, triple probes, or other custom arrangements.

How to measure Plasma Temperature and Density without an Electrostatic Probe?

If a plasma is too energetic to use a physical probe like a langmuir probe, Laser Interferometers can be used to measure useful plasma parameters.

Interferometers work by detecting the interference between two laser paths. One laser source is split into two paths with a beam splitter. One path is sent through the plasma, while the other is used as a reference path. By rejoining the paths into a detector, information about the plasma can be determined.

We have experience designing and building a variety of interferometers for use in plasma physics research. If you're thinking about using an interferometer, email our physics team.

How to measure Plasma current? How to measure the rate of change of a magnetic field?

We can measure plasma currents and rate of change in magnetic fields by using B-dot probe. B-dot probes are simple coils of wire. By measuring the voltage induced in the coil, information about the magnetic field can be determined.

If you want to characterize the field of your plasma, ask us about our B-Dot Probes.