Our multi-channel interferometer uses 1550 nm laser light to measure electron density with extreme precision. 
The setup splits light into two paths—one passing through plasma and one along a reference path. Relative to the light in the reference path, light going through plasma arrives at the detector with a phase difference proportional to the plasma’s electron density. Dense wavelength division multiplexing enables us to increase our channel count while reducing the number of common components.
This compact, high-performance system will fully diagnose our plasma’s electron density at every stage of FRC formation, acceleration, and compression.
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