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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....

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Enhancing Thomson scattering polychromator performance with multi-pass spectral filters.

W R Goodman¹, B Geiger¹

¹HSX Plasma Laboratory, University of Wisconsin, Madison, Wisconsin 53719, USA.

The Review of Scientific Instruments

|September 4, 2024

Summary

A new Thomson scattering spectral multiplexing method uses multi-bandpass filters to enhance electron temperature measurements. This technique improves signal-to-noise performance and reduces uncertainty in Thomson scattering diagnostics.

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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

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Area of Science:

Plasma physics
Optical diagnostics

Background:

Photon-deficient, noncollective Thomson scattering diagnostics rely on filter polychromators for spectral analysis.
Current methods commonly use single-passband optical filters, limiting measurement capabilities.

Purpose of the Study:

Introduce Thomson scattering spectral multiplexing, a novel spectral analysis method.
Enhance the electron temperature measurement range and reduce uncertainty in Thomson scattering diagnostics.

Main Methods:

Implemented multi-bandpass spectral filters in polychromators.
Optimized a multi-bandpass filter set using a genetic algorithm.
Tested the new method on the Helically Symmetric eXperiment (HSX).

Main Results:

Achieved an increased range of electron temperature measurement with fewer filters.
Reduced systematic measurement uncertainty and light loss.
Successfully demonstrated the benefits of Thomson scattering spectral multiplexing on HSX.

Conclusions:

Thomson scattering spectral multiplexing offers significant advantages over traditional methods.
The new technique improves diagnostic performance in photon-deficient, noncollective Thomson scattering.
This advancement has practical implications for plasma research and diagnostics.