Inner Surface Treatment Method of Superconducting Resonant Cavity for Superconducting Frequency Stabilized Oscillator

Abstract

The invention discloses a method for treating the inner surface of a superconducting resonant cavity of a superconducting frequency-stabilized oscillator, which comprises the following steps: centrifugal rolling and polishing, and the time for the centrifugal rolling and polishing is 10-15 days; low temperature annealing , the temperature of low-temperature annealing is 750°C, and the time of low-temperature annealing is 2-5 hours; the temperature of high-temperature annealing is 1400-1500°C, and the time of high-temperature annealing is 24-32 hours; 20-40 minutes; electropolishing; high-pressure water washing, the time of high-pressure water washing is 40-120 hours; low-temperature baking, the temperature of low-temperature baking is 70-80 ℃, and the time of low-temperature baking is 3-7 days. The method can effectively eliminate the protrusion on the inner surface of the superconducting resonant cavity caused by electron beam welding, thereby improving the Q value of the superconducting resonant cavity. When the frequency of the superconducting resonant cavity is 9 GHz, the Q value is as high as 10 9 .

Description

technical field [0001] The invention relates to the technical field of surface treatment methods, in particular to an inner surface treatment method for a superconducting resonant cavity of a superconducting frequency stabilized oscillator. Background technique [0002] Superconducting stabilized oscillator (SCSO) involves subjects and technologies such as radio physics, superconducting physics, electronics, control theory and precision machining. The frequency stability of SCSO can reach 10 -15 -10 -16 The order of magnitude far exceeds that of hydrogen atomic clocks, rubidium atomic clocks, and cesium atomic clocks. Therefore, SCSO is widely used in space navigation, global positioning navigation, gravity and relativistic physics and other fields. [0003] SCSO is mainly composed of superconducting resonant cavity, high-gain and low-noise frequency-locked loop, voltage-controlled oscillation source and low-temperature device. Superconducting resonant cavity is one of t...

AI Technical Summary

Problems solved by technology

[0008] 1. The protrusion on the inner surface of the superconducting resonant cavity caused by electron beam welding cannot be eliminated;

[0009] 2. The influence of impurities other than the superconducting material niobium cannot be completely eliminated, such as the influence of hydrogen adsorbed on the inner surface of the superconducting resonator and other metal elements introduced by electron beam welding, resulting in the inability to improve the Q value of the superconducting resonator

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