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Compact ECEI system with in-vessel reflective optics for WEST.

Y B Nam¹, H K Park², W Lee²

¹Department of Physics, Pohang University of Science and Technology, Pohang 37673, South Korea.

The Review of Scientific Instruments

|December 3, 2016

Summary

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A new Electron Cyclotron Emission Imaging (ECEI) system is being developed for the WEST tokamak to study MHD instabilities. This advanced diagnostic will provide high-resolution 2D electron temperature fluctuation images, crucial for understanding plasma behavior.

Area of Science:

Plasma Physics
Fusion Energy Research
Tokamak Diagnostics

Background:

MHD instabilities in tokamaks are critical to understand for stable fusion reactions.
Tungsten impurities can significantly affect plasma behavior and stability.
Existing diagnostic systems face limitations in space and beam path for detailed plasma imaging.

Purpose of the Study:

To develop and implement an Electron Cyclotron Emission Imaging (ECEI) system for the WEST tokamak.
To investigate Magnetohydrodynamic (MHD) instabilities influenced by tungsten impurities.
To achieve high spatial and temporal resolution 2D electron temperature (Te) fluctuation imaging.

Main Methods:

Designing an ECEI system with in-vessel optics, including large curvature-radius mirrors, to overcome installation constraints.

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Utilizing a similar electronic structure to established ECEI systems on KSTAR, DIII-D, and ASDEX-U.

Ensuring the in-vessel optics can withstand extreme heating during long-pulse operation (approx. 1000 s).

Main Results:

The ECEI system will deliver 2D Te fluctuation images across poloidal cross-sections.
Spatial resolution will be as high as 1.7 cm, with temporal resolution up to 2 μs.
The system is designed for limited installation space and reduced beam path lengths.

Conclusions:

The developed ECEI system will enhance the study of MHD instabilities in the WEST tokamak.
The innovative in-vessel optics design addresses challenges of space limitations and extreme operational conditions.
Successful commissioning is anticipated for the second WEST experimental campaign in late 2017.