Since their invention in the early 1940’s Photonis and its predecessors have been designing and manufacturing helix-type Traveling Wave Tubes for numerous defense applications. These helix-type traveling wave tubes are constructed using the industry standard of metal-ceramic and feature rare earth periodic permanent magnets for power-free focusing. Many of Photonis’ tubes are used for electronic countermeasures, radar applications, airborne military platforms, rack mount amplifiers, communications and SatCom. For these applications, Photonis has designed their various Traveling Wave Tubes to be conduction cooled for reliable operation in high-temperature environments. Photonis offers a variety of CW Traveling Wave Tubes, Pulsed Traveling Wave Tubes, MM Wave Traveling Wave Tubes and Miniature Traveling Wave tubes that can be customized to meet specific application requirements.