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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

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Published on: October 11, 2016

MAST YAG Thomson scattering upgrade alignment system.

J Figueiredo¹, G Naylor, M Walsh

¹Association EURATOM-IST, Av. Rovisco Pais, Lisboa 1049-001, Portugal. jfigueiredo@ipfn.ist.utl.pt

The Review of Scientific Instruments

|November 2, 2010

Summary

This summary is machine-generated.

A new alignment system ensures data quality for the upgraded MAST YAG Thomson scattering diagnostic. This system verifies laser alignment without intrusive sampling, enhancing diagnostic reliability and complex system management.

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Area of Science:

Plasma physics
Fusion energy research
Optical diagnostics

Background:

The Mega Ampere Spherical Tokamak (MAST) underwent a significant upgrade to its YAG Thomson scattering diagnostic system.
This upgrade doubled the number of operational YAG lasers to eight, increasing system complexity.
Precise alignment of each laser is critical for maintaining data quality and diagnostic reliability.

Purpose of the Study:

To describe the newly installed alignment system for the MAST YAG Thomson scattering diagnostic.
To detail the methods used to ensure accurate laser beam alignment within the complex diagnostic setup.
To validate the effectiveness of the alignment system in guaranteeing diagnostic performance.

Main Methods:

A novel alignment system was developed and installed.
The system samples 1% of each YAG laser beam.
A telescope demagnifies the sampled beam by a factor of 8 for CCD camera observation.
Camera scanning allows determination of beam profile and position along the beam path.

Main Results:

The alignment system effectively mimics the laser beam's path within MAST.
Beam alignment can be verified over several meters without sampling inside the tokamak vessel.
The system allows for precise determination of beam position and profile in the scattering zone.

Conclusions:

The new alignment system significantly enhances the reliability and data quality of the upgraded MAST YAG Thomson scattering diagnostic.
It provides a non-intrusive method for verifying laser alignment, crucial for complex, multi-laser systems.
This development is vital for the continued success of fusion energy research utilizing advanced diagnostics.