Preparation method of copper-niobium composite radio frequency superconducting resonant cavity

Abstract

The invention discloses a preparation method of a copper-niobium composite superconducting resonant cavity. The method comprises the following steps: 1) preparing a pure niobium superconducting cavity; 2) sequentially carrying out mechanical polishing, cleaning solution cleaning, ultrasonic ultrapure water cleaning and acid solution polishing on the inner and outer surfaces of the pure niobium superconducting cavity prepared in the step (1), removing residual acid on the surface of a material, and sequentially carrying out sand blasting and reverse plating electrocleaning treatment on the outer surface of the superconducting cavity after the residual acid is cleaned; 3) preparing a niobium-copper eutectic bond bonding structure on the outer surface of the pure niobium superconducting cavity: a, electroforming a transition metal layer on the outer surface of the pure niobium superconducting cavity; b, electroforming copper on the metal surface of the transition metal layer; and c, enabling the niobium-transition layer metal-copper layer to be subjected to vacuum high-temperature annealing, and generating inter-atomic eutectic bond bonding is generated on the copper and niobium layers through transition metal; 4) electroforming a thick copper layer on the copper layer on the outer surface of the superconducting cavity prepared in the step 3); and 5) performing finish machining on the outer surface of the superconducting cavity prepared in the step 4) to obtain the copper-niobium composite superconducting resonant cavity.

Description

technical field [0001] The invention belongs to the field of particle accelerator technology, radio frequency superconductivity and low temperature technology, and specifically relates to a method for preparing a copper-niobium composite radio frequency superconducting resonant cavity. Background technique [0002] The radio frequency superconducting resonant cavity (superconducting cavity for short) is the core component of a large particle accelerator, and its main function is to convert the energy stored in the electromagnetic field into the kinetic energy of charged particles. Generally based on the working electromagnetic field mode, superconducting cavities can be divided into transverse magnetic (TM) mode superconducting cavities and transverse electromagnetic (TEM) mode superconducting cavities. The representative of TM superconducting cavity is ellipsoidal cavity, including single-unit ellipsoidal cavity and multi-unit ellipsoidal cavity. Representatives of TEM sup...

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Problems solved by technology

The difficulty of technical route 1 is: the development of the copper-niobium composite plate and the purity control of the superconducting cavity formed by the copper-niobium composite plate and the difficult control of weld bead compounding

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