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Related Experiment Video

Updated: Aug 23, 2025

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

Published on: May 3, 2019

First divertor Thomson scattering measurements on MAST-U.

J G Clark¹, M D Bowden¹, Y Kim²

¹Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3BX, United Kingdom.

The Review of Scientific Instruments

|November 1, 2022

Summary

This summary is machine-generated.

The MAST-U Super-X divertor

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Area of Science:

Plasma physics
Fusion energy research
Divertor physics

Background:

The Mega Ampere Spherical Tokamak Upgrade (MAST-U) utilizes a Super-X divertor to manage heat flux and promote plasma detachment.
Understanding plasma behavior within the divertor is crucial for fusion reactor design.

Purpose of the Study:

To present the first measurements from the MAST-U divertor Thomson scattering diagnostic.
To investigate electron density and temperature in attached and detached plasma conditions within the Super-X divertor.

Main Methods:

Utilized a dedicated 30 Hz laser synchronized with the core Thomson scattering system.
Employed Raman scattering calibration in nitrogen.
Measured electron density and temperature across various plasma regimes, including near the detachment front.

Main Results:

Successfully obtained electron density measurements ranging from 1 x 10^18 to 5 x 10^19 m^-3.
Measured electron temperatures down to 0.5 eV, which was critical for observing detachment phenomena.
Demonstrated improved stray light rejection in the polychromator design, with very low stray light levels observed.

Conclusions:

The MAST-U divertor Thomson scattering diagnostic is operational and providing valuable data.
The diagnostic successfully measured key plasma parameters in attached and detached conditions, offering insights into Super-X divertor physics.
The enhanced polychromator design proved effective in minimizing stray light, ensuring data quality.