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Superconducting cavity nitrogen doping method

A superconducting cavity, nitrogen doping technology, applied in metal material coating process, coating, solid-state diffusion coating and other directions, can solve the problem of difficult to reduce, to reduce surface resistance, save cost and operating costs, reduce The effect of power consumption

Active Publication Date: 2018-07-13
INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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Problems solved by technology

[0004] With the development and progress of related technologies, at present, the surface resistance of superconducting cavities is close to the limit of traditional BCS superconducting theory, and it is difficult to continue to reduce

Method used

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Embodiment Construction

[0031] In order to better illustrate the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] Process flow of the present invention such as figure 2 As shown, the following combination figure 2 The nitrogen doping technology of this superconducting cavity is introduced in detail.

[0033] 1. Before the superconducting cavity is doped with nitrogen, in order to remove the defects (potholes, bumps, pollution) on the surface (mainly the inner surface) of the superconducting cavity, the inner and outer surfaces must be pre-treated. The general process is as follows:

[0034] 1. Carry out visual inspection. The inner and outer surfaces of the superconducting cavity must be smooth, flat and clean, and the welds on the inner surface must be polished until there is no obvious unevenness.

[0035] 2. After brushing the outer surface of the superco...

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Abstract

The invention discloses a superconducting cavity nitrogen doping method. The method comprises the following steps that 1), a superconducting cavity is integrally put into an ultrasonic cleaning tank for cleaning, then the inside and the outside of the superconducting cavity are washed clean by using pure water, and are dried in the air, then buffering chemical polishing is carried out on the innersurface of the superconducting cavity, and then, the inner surface of the superconducting cavity is cleaned, and is dried in the air; 2), the superconducting cavity treated through the step 1) is putinto a vacuum furnace for heating, and after the superconducting cavity is heated to a set temperature, hydrogen removal treatment is carried out on the vacuum furnace at the set temperature and pressure; 3), after the hydrogen removal treatment is finished, a gas extraction valve of the vacuum furnace is closed, high-purity nitrogen is injected, the pressure in the vacuum furnace is kept at 2-4Pa, and the nitrogen is doped into the surface of the superconducting cavity; 4), after nitrogen injection is finished, the nitrogen removal treatment is carried out on the vacuum furnace; and 5), after the nitrogen removal treatment is finished, time is set for vacuum cavity heat preservation, and nitrogen doping of the superconducting cavity is completed. According to the method, the surface resistance of the superconducting cavity can be further reduced, so that the power consumption of the superconducting cavity is reduced.

Description

technical field [0001] The invention relates to a nitrogen doping method for a superconducting cavity, which belongs to the technical field of superconducting. Background technique [0002] A superconducting cavity is a microwave resonant cavity used in accelerators to accelerate charged particles. The current superconducting cavities are all made of metal niobium. Compared with normal temperature cavities, they have obvious advantages (high acceleration gradient, low cavity loss, and large beam aperture). Therefore, superconducting cavities are now commonly used in major accelerator devices in the world. Accelerate charged particles of all kinds (electrons, protons, heavy ions...). [0003] There are two main indicators to measure the performance of a superconducting cavity: the acceleration gradient E acc and surface resistance R S . R S Proportional to the power dissipation of the cavity, R S The smaller the , the smaller the power consumption of the superconducting...

Claims

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Application Information

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IPC IPC(8): C23C8/24C23C8/02C23F3/06
CPCC23C8/02C23C8/24C23F3/06
Inventor 沙鹏刘佰奇董超郑洪娟米正辉翟纪元
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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