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Development of a nine spatial point, multipulse Thomson scattering diagnostic.

F Glass¹, B H Deng, E Garate

¹Tri Alpha Energy, Inc., Rancho Santa Margarita, California 92688, USA. fenton@trialphaenergy.com

The Review of Scientific Instruments

|November 2, 2010

Summary

A new Thomson scattering diagnostic system was developed for the C-2 device to measure electron temperatures. This system accurately estimates plasma electron temperatures across multiple spatial points for fusion energy research.

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Area of Science:

Plasma Physics
Fusion Energy Research
Diagnostic Techniques

Background:

The C-2 device requires precise measurements of plasma parameters.
Electron temperature is a critical parameter for understanding plasma behavior in fusion devices.
Existing diagnostic methods may have limitations in spatial coverage or accuracy.

Purpose of the Study:

To develop and implement a Thomson scattering diagnostic system for the C-2 field-reversed configuration device.
To enable spatially resolved measurements of electron temperature.
To provide accurate and reliable electron temperature data for plasma analysis.

Main Methods:

Utilized a multipulse ruby laser for Thomson scattering.
Employed twin collection lenses and nine optical fiber pairs for photon collection.
Implemented a polychromator with six spectral channels and compact photomultipliers for detection.
Integrated digital storage oscilloscopes with the MDSplus database for data acquisition.

Main Results:

Successfully measured electron temperature at nine spatial points (r≈1-41 cm).
The system is capable of estimating electron temperatures in the range of approximately 10-200 eV.
Automated generation of temperature and error estimates post-plasma discharge.

Conclusions:

The developed Thomson scattering diagnostic is a valuable tool for C-2 plasma research.
The system provides crucial electron temperature data with good spatial resolution.
This diagnostic enhances the understanding of plasma properties in field-reversed configurations.