A combined millimeter wave and CO₂ interferometer on the C-2W Jet plasma

A two wavelength tangentially viewing multi-chord interferometer has been built for the Jet plasma of the C-2W experiment at TAE Technologies. A novel 1 mm wavelength interferometer has been developed to be used simultaneously with a CO₂ laser interferometer to provide full coverage of the Jet plasma and the translating field-reversed configuration (FRC) plasma before merging. With CO₂ and millimeter wave sources, the interferometer proposes to cover a combined dynamic range of line integrated density of more than 1000 although the CO₂ interferometer sub-system is not yet operational. Sited at the axial location of the mirror field of C-2W, the interferometer will play a pivotal role in assessing the FRC before merging and the operation of the inner and outer divertors and particle outflow. The performance of the millimeter wave interferometer and recent measurements is discussed.