Three-dimensional tomographic imaging for dynamic radiation behavior study using infrared imaging video bolometers in...

Area of Science:

• Plasma physics
• Fusion energy research
• Diagnostic techniques

Background:

• Accurate measurement of plasma radiation is crucial for understanding and controlling fusion devices.
• Previous methods lacked the resolution to capture 3D dynamic radiation behavior.

Purpose of the Study:

• To design and validate a 3D tomography system for measuring plasma radiation in a large helical device.
• To achieve the first 3D direct tomographic measurement of magnetically confined plasma radiation.

Main Methods:

• Development of a 3D tomography system utilizing four InfraRed imaging Video Bolometers (IRVBs).
• Application of Tikhonov regularization with minimum generalized cross-validation for spatial inversion.
• Utilizing the EMC3-EIRENE 3D transport code for numerical phantom generation and testing.
• Relative calibration using a decaying plasma model during radiation collapse.

Main Results:

• The system successfully reconstructed 3D radiation profiles and captured dynamic behavior, including inboard radiation enhancement during collapse.
• Reconstruction results showed consistency with resistive bolometer signals.
• Demonstrated the system's capability to respond to temporal plasma profile changes.

Conclusions:

• The designed 3D tomography system is effective for 3D radiation imaging in fusion devices.
• This represents a significant advancement in plasma diagnostic capabilities.
• The system enables detailed study of radiation phenomena in magnetically confined plasmas.