3D-Printed Notch Filters for Microwave Diagnostic Systems of Controlled Thermonuclear Fusion Plants

The possibility of using 3D-printing technology with subsequent metallization in the manufacture of band-pass waveguide notch filters designed to ensure the operation of sensitive receiving equipment in experiments on collective Thomson scattering on plasma electron density fluctuations, which use high-power (up to several hundred kilowatts) probing radiation, is discussed. A two-resonator prototype of the filter has been created, its characteristics have been studied, and its operation has been tested in real conditions. The obtained results indicate the prospects of the technology used. Given that such filters play a key role in ensuring the electromagnetic compatibility of diagnostic receiving equipment and the gyrotron, the proposed technology for manufacturing microwave components opens up possibilities of interest to a wide range of researchers.