Microwave resonant cavity

Abstract

The invention discloses a microwave resonant cavity. The microwave resonant cavity comprises a cavity body and a film layer located on the surface of the inner wall of the cavity body. The film layer is made of a dielectric material capable of conducting heat. The internal film layer structure of the microwave resonant cavity has certain heat conductivity, heat generated at a hot spot of the conductive wall can be more effectively conducted to a low-temperature position far away from a heating spot, so that the maximum temperature rise at the hot spot is reduced, and the positive feedback effect caused by heat loss is further reduced; the internal film layer is a dielectric medium, is non-conductive, and almost does not interact with a microwave electromagnetic field, so that extra heat loss is not generated; the overall operation stability of the microwave resonant cavity is improved; the dielectric film with stable chemical property plated on the inner wall can also play a protection role, for example, magnesium boride is unstable in chemical property, is easy to decompose when meeting water, cannot be cleaned by high-pressure ultrapure water and other treatment methods, and after the dielectric film is added, the inner wall of the resonant cavity can be protected.

Description

technical field [0001] The invention relates to a microwave resonant cavity, which belongs to the technical field of microwaves. Background technique [0002] The resonant cavity is surrounded by conductive walls of any shape, and electromagnetic standing waves are formed in it, thereby providing a resonant acceleration voltage for charged particles, which is an important part of particle accelerators. According to the state of the conductor during operation, the resonant cavity is divided into a constant conducting cavity and a superconducting cavity. The constant conduction cavity is generally made of pure copper and aluminum, while the superconducting cavity is divided into pure metal cavity, including lead, niobium metal cavity, etc.; And magnesium boride thin film cavity and so on. Due to the nature of microwaves, whether it is normal conduction or superconductivity, the current distribution of the cavity is generally concentrated on the very shallow surface inside th...

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Problems solved by technology

However, with the technological progress of more than half a century, the improvement brought by various surface treatment technologies and the technology of improving the thermal conductivity of the cavity itself has reached the limit; at the same time, because the mechanical strength of the cavity should not be too low, the cavity material It is not possible to use high thermal conductivity materials with high purity but soft materials, resulting in the performance of the resonant cavity almost reaching the bottleneck. There is no systematic way to improve the performance of the resonant cavity in the near future

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