Spoke superconducting cavity tuner

Abstract

The invention discloses a Spoke superconducting cavity tuner. The Spoke superconducting cavity tuner comprises a tuning arm, a piezoelectric ceramic fixed seat, a moment steering apparatus, and a piezoelectric ceramic positioned in the internal of thermostat, and a stepper motor positioned in the external of the thermostat, wherein the piezoelectric ceramic is mounted on the piezoelectric ceramic fixed seat; one end of the moment steering apparatus is connected with the stepper motor through a main shaft of a tuner while the other end of the moment steering apparatus is connected with the piezoelectric ceramic; the moment steering apparatus is used for converting the rotation moment of the stepper motor to be a set angle and then transmitting to the piezoelectric ceramic; and the piezoelectric ceramic fixed seat is connected with the tuning arm. Compared with the prior art, the Spoke superconducting cavity tuner greatly enlarges the mechanical tuning range of the tuner, and is convenient to maintain.

Description

technical field [0001] The invention relates to a Spoke superconducting cavity tuner, which belongs to the technical fields of particle accelerator and superconducting low temperature. Background technique [0002] The Spoke superconducting cavity tuner is an important part of the superconducting high-frequency system of the heavy ion linear accelerator, and it is a set of electromechanical hybrid system. Its main actuator works in the harsh environment of 2K (or 4K) low temperature, high vacuum, and radiation, and is used to control the operating frequency of the Spoke superconducting cavity: when the superconducting cavity is compensated or damped, due to the Lorentz force and beam load The frequency change of the superconducting cavity caused by the effect, the microphone effect, etc., and the change of the static detuning frequency. [0003] In order to deal with nuclear waste more effectively and safely, nuclear physicists have proposed the accelerator-driven subcritic...

AI Technical Summary

Problems solved by technology

[0007] (1) The mechanical tuning range is small, about 135kHz: Due to the double-lever structure, although the tuning reduction ratio is increased, the piezoelectric ceramics cannot withstand excessive lateral shearing force, so the downward movement of the auxiliary arm is limited. displacement, 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, when the frequency of the cavity exceeds the range of 135kHz, the superconducting cavity will not be able to operate at the pre-designed operating frequency.

[0008] (2) This tuner uses a low-temperature motor, which is costly and difficult to maintain: the operating temperature of the tuner inside the thermostat is about 5K, such a low temperature requires a reliable motor, and currently imported German stepping motors are basically used , a set of motor is about 100,000 yuan, and the cost is relatively high; and it works in a low temperature, radiation, and vacuum environment. When there is a problem with the motor, the entire thermostat needs to be reheated, and then the thermostat can be opened to replace and repair the motor. Increased failure risk and maintenance difficulty, and long maintenance cycle

[0009] (3) This kind of tuner itself does not have operation monitoring and protection equipment: the actuator of the tuner works in a vacuum-tight low-temperature environment. If it does not have monitoring and protection equipment, it cannot monitor the operation status of the tuner in real time, which may easily lead to misoperation , causing equipment damage

[0010] (4) 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 large deformation

[0011] The above four points reduce the performance of the Fermilab tuner to a certain extent, which is not conducive to the debugging and stable operation of the accelerator

Images