Low-temperature insertion rod tuner and superconducting cavity

Abstract

The invention discloses a low-temperature insertion rod tuner and a superconducting cavity. The low-temperature insertion rod tuner comprises an insertion rod assembly and an adjusting assembly; the insertion rod assembly comprises a first telescopic device and an insertion rod, the upper end of the first telescopic device is connected with the adjusting assembly through a top flange, and the lower end of the first telescopic device is used for sealed connection with an opening arranged on the superconducting cavity, so that a closed system is formed between the insertion rod assembly and thesuperconducting cavity; and the adjusting assembly controls telescoping of the first telescopic device, and controls the length of the insertion rod in the first telescopic device inserted into the superconducting cavity. The low-temperature insertion rod tuner provided by the invention is relatively compact in structure, and the superconducting cavity body is not required to be deformed, and acting force required for frequency tuning is small. The tuning range of the tuner is directly determined by the amount of compression or stretching of a bellows, and the frequency of the superconductingcavity can be adjusted in a relatively large range.

Description

technical field [0001] The invention relates to a low-temperature plunger tuner and a superconducting cavity, and belongs to the technical fields of particle accelerator and superconducting low temperature. Background technique [0002] The tuner is an important part of the superconducting cavity system. It is a set of electromechanical hybrid system, which is used to compensate the frequency change caused by the processing and assembly errors of the superconducting cavity. Frequency deviation caused by loading effect, microphone effect, etc. [0003] In recent years, superconducting accelerator technology has entered a stage of rapid development, and many large-scale superconducting accelerator projects have emerged at home and abroad, such as European hash neutron source, China CIADS, Korean heavy ion accelerator RAON and other device projects. Both the injection section and the main acceleration section at the front end of the accelerator use low-frequency superconductin...

AI Technical Summary

Problems solved by technology

[0006] (1) The mechanical tuning range is small: due to the double-lever structure, although the tuning reduction ratio is increased, the downward movement of the auxiliary arm is limited because the piezoelectric ceramics cannot withstand excessive lateral shear force. resulting in a small tuning range

Since there are many factors that affect the frequency change in the process of superconducting cavity manufacturing, welding, and assembly, if the frequency error is too large, the superconducting cavity will not be able to operate at the pre-designed operating frequency.

[0007] (2) The force exerted by the main arm of the tuner on the end cover of the superconducting cavity is concentrated at two points, and the force is uneven, which may easily cause excessive local stress and plastic deformation

[0008] (3) Due to space limitations, only one set of tuners can be installed in each superconducting cavity, and the requirements for the tuner mechanism are relatively strict, which cannot meet the frequency adjustment requirements of low-β multi-gap superconducting cavities

[0009] The above three points reduce the working performance of the superconducting cavity to a certain extent, and there are certain equipment safety hazards, which are not conducive to the debugging and stable operation of the accelerator, as well as the large-scale development and application of the superconducting accelerator.

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