Design, Development, and Operation of Seven Channels’ 100-GHz Interferometer for Plasma Density Measurement

A seven-channel microwave interferometer (100 GHz) is designed, developed, and used to measure the radial profile of the plasma density (n
_e
) in Aditya tokamak. The resolution of the density measurement is n
_e
= 2 × 10
¹¹
cm
^-3
. The spatial and time resolutions are 7 cm and 10μs, respectively. The chord-averaged measurements from seven channels are Abel inverted to obtain the radial profile of the plasma density. Plasma density measured by the microwave interferometer is well matched with that measured by the Thomson scattering diagnostics.