Virtual Prototype of a Dielectric Window for High Power Microwave Tubes

This paper describes the Virtual Prototype of a Dielectric Window (DW) for High Power Microwave Vacuum Tubes and Linear Accelerators (LINAC). Design formulas are provided and Computer Aided Design techniques based on COMSOL Multiphysics are proposed. The virtual prototype considers the Thermo-mechanical effects due to the joule effect induced by the power which crosses the DW and the Thermal contact with the Tube connected to the device. The proposed analysis involves Electromagnetic Waves (EMW), Joule Heating and Thermal Expansion (JHTE) and Moving Mesh (MM) interfaces of COMSOL Multiphysics. In this study, we show how to compensate the thermal induced degradation of the device performances, by exploiting the consequent Thermo mechanical deformation of the opportunely designed device shape, which modify constructively the electromagnetic (EM) fields to re-increase performances.