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Related Experiment Video

Updated: May 17, 2026

Optimization, Test and Diagnostics of Miniaturized Hall Thrusters

Optimization, Test and Diagnostics of Miniaturized Hall Thrusters

Published on: February 16, 2019

A Thomson scattering diagnostic on the Pegasus Toroidal experiment.

D J Schlossberg¹, N L Schoenbeck, A S Dowd

¹Department of Engineering Physics, University of Wisconsin, Madison, Wisconsin 53706, USA. schlossberg@wisc.edu

The Review of Scientific Instruments

|November 7, 2012

Summary

A new Thomson scattering system enhances plasma diagnostics on the Pegasus Toroidal Experiment using advanced lasers and cameras. This system enables precise measurements of plasma density and electron temperature for fusion research.

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Area of Science:

Plasma Physics
Fusion Energy Research
Optical Diagnostics

Background:

Accurate plasma characterization is crucial for fusion energy development.
Existing Thomson scattering systems face limitations in resolution and data acquisition.
The Pegasus Toroidal Experiment requires advanced diagnostic tools for plasma studies.

Purpose of the Study:

To design and implement a novel Thomson scattering system for the Pegasus Toroidal Experiment.
To achieve high-resolution, multi-point measurements of plasma parameters.
To leverage recent technological advancements for improved plasma diagnostics.

Main Methods:

Utilized high-energy pulsed lasers (frequency-doubled Nd:YAG), volume phase holographic diffraction gratings, and image-intensified CCD cameras.
Developed a custom optical collection system for scattered photons with 14 mm radial resolution.
Integrated a vacuum-compatible beam path with a removable beam dump for maintenance.

Main Results:

The system operates at 532 nm with 2 J energy and 7 ns pulse duration.
Photon collection spans major radii from 15 cm to 85 cm.
Estimated signal of ~3.5 × 10(4) photons at 10(19) m(-3) plasma density.

Conclusions:

The new Thomson scattering system is operational and capable of measuring plasma densities from mid-10(18) to mid-10(19) m(-3).
Electron temperatures can be determined in the range of 10 to 1000 eV.
This advanced diagnostic tool significantly contributes to the understanding of plasma behavior in toroidal devices.