High-power RF coupler

Abstract

The invention relates to the field of RF technologies particle accelerators, in particular to a high-power RF coupler. By the adoption of a bowl-shaped ceramic window structure and a reasonable production technology, the problem of impedance matching of coupler transmission lines is well solved. An inner conductor and an outer conductor are each of a cylindrical structure and are made of oxygen-free copper materials and provided with cooling channels. According to the outer conductor, circulating cooling is formed by a plurality of axial waterways; according to the inner conductor, a single cooling waterway is connected with a loop of the outer conductor in series. The bowl-shaped ceramic window is formed by welding transition metal flanges and ceramic based on a special welding technology, so that the atmosphere is isolated from a vacuum, insulation between the inner connector and the outer conductor is achieved, and a cooling loop is arranged in the direction of the inner diameter and the outer diameter of the ceramic window. The inner surface of the ceramic window is plated with a titanium nitride coating so that heat caused by secondary electron emission can be prevented. The bowl-shaped ceramic window structure is good in stress, and the impedance of the transmission lines does not have the abrupt change problem; according to the RF coupler, the impedance matching problem is well solved, the high-frequency power transmission efficiency is higher, generated heat is smaller, and the structure is more compact under the equal power level.

Description

technical field [0001] The invention relates to the field of particle accelerator radio frequency technology, in particular to a radio frequency high-power coupler. Background technique [0002] At present, the development of clean energy has become a priority for global energy development. Accelerator-driven nuclear waste transmutation system ADS (Accelerator-Driven System) is an effective way to achieve clean energy. The strong-current megawatt-level high-power proton accelerator is an ADS system. One of the most critical systems in the The room temperature linear accelerator is an input stage of a high-power proton accelerator with a high-current megawatt level. Its output current is 15 mA and its output energy is 2.1 MeV. of RF power. In the prior art, ceramic windows of this type of power level mostly adopt thin-walled flat-plate and sleeve-type structures. In order to meet the impedance requirements of flat-type ceramic windows, the outer diameter and inner diameter ...

AI Technical Summary

Problems solved by technology

In the prior art, ceramic windows of this type of power level mostly adopt thin-walled flat plate and sleeve-type structures. In order to meet the impedance requirements of flat-plate ceramic windows, the outer diameter and inner diameter of the coaxial feed tube are usually changed to achieve variable resistance. The structure does not need to change the outer diameter and inner diameter of the coaxial feed tube, and the impedance can be adjusted by ring insertion, but the structure of both is more complicated than the bowl-shaped ceramic window, it is not easy to manufacture, and the creepage distance is shorter, which is easy to generate discharge. And it cannot be disassembled, which is inconvenient for future use and maintenance, and the manufacturing cost is several times that of bowl-shaped ceramic windows

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