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The multi-spectral line-polarization MSE system on Alcator C-Mod.

R T Mumgaard¹, S D Scott², M Khoury¹

¹Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

The Review of Scientific Instruments

|December 3, 2016

Summary

This summary is machine-generated.

A new multi-spectral line-polarization motional Stark effect (MSE-MSLP) diagnostic improves tokamak plasma measurements. This advanced system enables simultaneous multi-wavelength Stokes vector analysis for enhanced polarized background subtraction.

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Area of Science:

Plasma Physics
Fusion Energy Research
Optical Diagnostics

Background:

Tokamak devices require precise plasma diagnostics for fusion energy development.
Motional Stark Effect (MSE) diagnostics measure plasma properties using polarized light.
Existing MSE systems face challenges with polarized background subtraction.

Purpose of the Study:

To develop and qualify a novel multi-spectral line-polarization motional Stark effect (MSE-MSLP) diagnostic.
To enhance polarized background subtraction capabilities for tokamak plasma measurements.
To create a versatile and cost-effective diagnostic system.

Main Methods:

Simultaneous measurement of Stokes vector in multiple wavelength bands on a single sightline.
Design and implementation of a ten-sightline, four-wavelength MSE-MSLP detector system.
Utilization of high-throughput polychromators with narrow bandpass interference filters and avalanche photodiode detectors.
Automated temperature tuning of filter wavelengths using custom ovens.

Main Results:

Successful design, construction, and qualification of the MSE-MSLP system.
Demonstrated capability for precise spectral filtering and large étendue.
Development of a system with remote controllability and ease of retrofitting.

Conclusions:

The developed MSE-MSLP diagnostic offers significant improvements for tokamak plasma analysis.
The system provides enhanced polarized background subtraction, crucial for accurate measurements.
This technology is adaptable and can be integrated into existing MSE setups.