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Design and implementation of a full profile sub-cm ruby laser based Thomson scattering system for MAST.

T O'Gorman¹, P J Mc Carthy, S Prunty

¹Department of Physics, University College Cork, Association Euratom-DCU, Cork, Ireland.

The Review of Scientific Instruments

|January 5, 2011

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Upgrades to the ruby Thomson scattering (TS) system on the Mega-ampere spherical tokamak (MAST) enhance electron temperature and density measurements. The improved TS system offers higher spatial resolution and accuracy for fusion plasma diagnostics.

Area of Science:

Plasma Physics
Fusion Energy Research
Diagnostic Systems

Background:

The Mega-ampere spherical tokamak (MAST) utilizes two Thomson scattering (TS) systems for plasma diagnostics.
Independent electron temperature and density profiles are crucial for tokamak operation and research.

Purpose of the Study:

To detail the design and implementation of a major upgrade to the ruby TS system on MAST.
To improve the spatial resolution, accuracy, and data acquisition capabilities of the ruby TS diagnostic.

Main Methods:

The upgraded ruby TS system employs a high-energy pulsed laser and advanced collection optics.
A new intensified CCD camera enables high-speed, dual-snapshot measurements.
Automated system operation facilitates seamless integration with MAST discharges.

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Main Results:

The system achieves 512 measurement points across the major radius with 7 mm spatial resolution.
Accurate measurements of electron temperature (T(e)) and density (n(e)) are obtained with low estimated errors (<4% T(e), <3% n(e)).
The system can acquire two profiles with a minimum time separation of 230 μs, enabling dynamic plasma studies.

Conclusions:

The upgraded ruby TS system significantly enhances diagnostic capabilities for MAST.
Improved spatial and temporal resolution provides more detailed insights into fusion plasma behavior.
The system's accuracy and automation contribute to more effective tokamak research.