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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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NSTX far infrared tangential interferometer/polarimeter electronics upgrade.

W C Tsai¹, C W Domier, K C Lee

¹Department of Electrical and Computer Engineering, University of California, Davis, California 95616, USA.

The Review of Scientific Instruments

|November 2, 2010

Summary

New electronics for the National Spherical Torus Experiment (NSTX) now monitor high-frequency density fluctuations up to 4 MHz. This advancement is crucial for understanding plasma transport physics in NSTX and for the future ITER project.

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Area of Science:

Plasma physics
Fusion energy research
Diagnostic instrumentation

Background:

High-frequency density fluctuations are key to understanding plasma transport.
Previous diagnostic systems on NSTX had limited bandwidth (∼250 kHz).
Accurate measurements are vital for both current experiments and future fusion devices like ITER.

Purpose of the Study:

To introduce and detail upgraded electronics for the interferometer/polarimeter system on NSTX.
To enhance the system's capability for monitoring high-frequency density fluctuations.
To present experimental validation of the new electronics' performance.

Main Methods:

Implementation of new electronic components for the far infrared tangential interferometer/polarimeter.
Configuration of the system for interferometry-only operation (4 MHz bandwidth).
Configuration for simultaneous interferometer/polarimeter operation (∼500 kHz bandwidth).

Main Results:

Extended video bandwidth to 4 MHz in interferometry-only mode.
Achieved ∼500 kHz bandwidth in simultaneous interferometer/polarimeter mode.
Demonstrated successful operation and data acquisition with the upgraded electronics.

Conclusions:

The upgraded electronics significantly enhance the diagnostic capabilities of the NSTX system.
These advancements enable more detailed studies of plasma transport physics.
The improved system provides crucial data for NSTX and informs designs for ITER.