Optically isolated millimeter-wave detector for the Toroidal Plasma Experiment

Area of Science:

• Plasma Physics
• Microwave Engineering
• Experimental Instrumentation

Background:

• Millimeter-wave propagation experiments are susceptible to electromagnetic interference.
• Powerful microwave sources, such as 2.45 GHz systems, can disrupt sensitive measurements.
• Existing detection systems may lack sufficient noise immunity for complex experimental environments.

Purpose of the Study:

• To design and construct an optically isolated millimeter-wave detection system.
• To mitigate interference from a nearby 2.45 GHz microwave source.
• To enhance the capabilities of millimeter-wave propagation studies in the TORoidal Plasma EXperiment (TORPEX).

Main Methods:

• Development of an optically isolated detection system.
• Integration of the system into the TORPEX facility.
• Testing the system's noise immunity and detection capabilities.

Main Results:

• The optically isolated system demonstrated excellent noise immunity.
• The system successfully prevented interference from the powerful 2.45 GHz microwave source.
• The new detector resolved effects previously unobservable with a bare Schottky diode.

Conclusions:

• Optical isolation is an effective strategy for shielding millimeter-wave detectors from external interference.
• The developed system significantly enhances the reliability and sensitivity of millimeter-wave diagnostics in plasma physics.
• This advancement enables more detailed investigations of millimeter-wave propagation phenomena in noisy environments.