Fast imaging diagnostics on the C-2U advanced beam-driven field-reversed configuration device

Area of Science:

• Plasma Physics
• Fusion Energy Research
• Optical Engineering

Background:

• The C-2U device utilizes advanced techniques like neutral beam injection and end-biasing to sustain Field-Reversed Configuration (FRC) plasma.
• Effective diagnostics are essential for understanding and optimizing plasma confinement and stability.

Purpose of the Study:

• To design and implement novel fast imaging instruments for the C-2U device.
• To achieve both radial and near-axial plasma views for comprehensive diagnostics.
• To develop a robust optical system capable of operating in a demanding experimental environment.

Main Methods:

• Development of two custom fast imaging instruments utilizing a common camera platform.
• Implementation of re-entrant viewports with welded bellows to accommodate specific viewing geometries.
• Design of a high-throughput, lens-based optical periscope to relay plasma images to high-speed cameras.
• Integration of remote-controlled filter wheels for isolating specific emission lines.

Main Results:

• Successful development and implementation of radial and axial plasma imaging systems.
• Demonstration of the optical system's capability to relay clear plasma images.
• Acquisition of sample data showcasing the imaging performance and diagnostic utility.
• The vacuum optics system allowed for retraction and isolation during gettering and maintenance.

Conclusions:

• The developed imaging instruments provide effective diagnostic capabilities for FRC plasma studies on the C-2U device.
• The custom optical periscope and camera platform design meet the requirements for high-speed plasma imaging.
• These diagnostics contribute to advancing the understanding and control of FRC plasma for fusion energy applications.