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Updated: Sep 2, 2025

Emission Spectroscopic Boundary Layer Investigation during Ablative Material Testing in Plasmatron

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Published on: June 9, 2016

A novel polychromator calibration method for Thomson scattering diagnostics.

Q F Xie¹, H Y Li¹, R Y Tao¹

¹Hebei Key Laboratory of Compact Fusion, Langfang 065001, China.

The Review of Scientific Instruments

|August 3, 2022

Summary

This summary is machine-generated.

A new method calibrates polychromator spectral responsivity for Thomson scattering plasma diagnostics. This technique uses a pulsed Light Emission Diode (LED) for accurate, in situ measurements of electron temperature and density.

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Area of Science:

Plasma Physics
Optical Diagnostics
Spectroscopy

Background:

Polychromators are essential for Thomson scattering (TS) diagnostics to determine plasma electron temperature (T_e) and density (n_e).
Accurate calibration of spectral response and relative spectral responsivities is crucial for reliable T_e measurements.

Purpose of the Study:

To introduce and detail a novel method for calibrating the relative spectral responsivities of polychromators used in TS diagnostics.
To present a simpler, more efficient, and flexible approach for in situ calibration.

Main Methods:

Conventional calibration of spectral response using a bromine tungsten lamp and monochromator.
Novel calibration of relative spectral responsivities using a broadband pulsed Light Emission Diode (LED) with pulse width similar to TS signals (10-20 ns FWHM).
Absolute sensitivity calibration for n_e measurements using Rayleigh scattering with argon gas.

Main Results:

The pulsed LED method allows for accurate, simple, efficient, and flexible in situ calibration of polychromator relative spectral responsivities.
Formulas are provided for calculating plasma density from calibration data and polychromator signals.

Conclusions:

The novel LED-based calibration method enhances the accuracy and practicality of TS diagnostic systems.
This technique facilitates reliable in situ system calibration, improving plasma parameter measurements.