Paper
Design of Liquid Face Cooled Double-Disc Window for Gyrotron
- Authors:
- M K Alaria; Y Choyal; A K Sinha
- Abstract
- The design of face cooled double disc window for 42 GHz, 200 kW Gyrotron has been carried out using the CST microwave studio. In this design double discs D1 and D2 of diameter 85 mm and thickness 3.2 mm sapphire window and spacing of discs 2.7 mm have been used in the simulation and sapphire discs are face cooled by Coolant FC-75. The return loss (S11) and transmission loss (S21) of the 42 GHz Gyrotron window have been found -40.3 dB and -0.04 dB respectively. The double disc face cooled structure causes power loss in two discs. In addition, loss in the coolant also has to be taken into account. However, as far as cooling of dielectric is concerned this design is the most effective. The reflection and absorption of RF power depends on the dielectric properties of sapphire as well as coolant liquid. The window geometrical parameters are optimized considering the minimum return loss and the minimum insertion loss by using CST microwave studio. The thermal design of the face cooled window during extreme case of operation, i.e. at saturation has been carried out using ANSYS software and discussed in the paper. The temperature range on the sapphire disc surface has been found to be 350C - 800C. The temperature range on the window disc surface has been found satisfactory. The RF window optimized design allows low heat loads in the ceramic and consequently low temperature increase and low stresses. The power handing capacity of face cooled window has been determined by ANSYS. This design of RF window is capable of handling the thermal and mechanical loading in a 200 kW output power.
- Keywords
- RF Window; Thermal Analysis; Stress; Cooling Channel; Heat Flux
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