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Development of a bolometry diagnostic for SPARC.

R Li¹, M L Reinke¹, I Abramovic¹

¹Commonwealth Fusion Systems, Devens, Massachusetts 01434, USA.

The Review of Scientific Instruments

|August 30, 2024

Summary

This summary is machine-generated.

The SPARC bolometry diagnostic uses resistive sensors and 248 sightlines to map plasma radiated power in 2D and 3D. This system is crucial for controlling SPARC tokamak power and understanding plasma behavior during disruptions.

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Area of Science:

Fusion energy research
Plasma physics diagnostics

Background:

Accurate measurement of plasma radiated power is essential for controlling and optimizing fusion devices like SPARC.
Understanding the spatial distribution (2D and 3D) of radiated power is key for power balance and divertor performance.
Mitigating thermal loads during plasma disruptions requires precise radiated power data.

Purpose of the Study:

To detail the design and development of the SPARC bolometry diagnostic system.
To enable precise measurement of total radiated power and its spatial distribution within the SPARC tokamak.
To support SPARC's operational control, divertor concept investigation, and disruption mitigation studies.

Main Methods:

Utilizing proven resistive bolometer sensor technology with gold absorbers and aluminum/carbon layers.
Integrating 248 lines of sight via pinhole cameras across 20 locations for comprehensive plasma viewing.
Designing robust components (holders, camera boxes, cabling) to withstand operational conditions (neutron flux, high temperatures).
Employing Cherab software for the design and optimization of pinhole camera lines of sight.

Main Results:

The bolometry system is designed with 14 camera locations for 2D power mapping and 6 for 3D disruption analysis.
Components are engineered for resilience against high neutron flux and temperatures up to 400°C.
Sensor chips feature gold absorbers, aluminum heat conduction, and carbon anti-reflective layers, bonded to AlN circuit boards.

Conclusions:

The SPARC bolometry diagnostic design is nearing completion, incorporating advanced sensor technology and a multi-view configuration.
The diagnostic is poised to provide critical data for SPARC's operational control and physics research.
Ongoing validation efforts aim to ensure the diagnostic's reliability and accuracy for fusion power applications.