Thermal and structural analysis of a cryogenic conduction cooling system for a HTS NMR magnet

IF 0.2 Q4 PHYSICS, APPLIED

Progress in Superconductivity and Cryogenics Pub Date : 2016-03-31 DOI:10.9714/PSAC.2016.18.1.059

S. In, Y. Hong, H. Yeom, J. Ko, Hyobong Kim, Seongje Park

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引用次数: 0

Abstract

Abstract The superconducting NMR magnets have used cryogen such as liquid helium for their cooling. The conduction cooling method using cryocoolers, however, makes the cryogenic cooling system for NMR magnets more compact and user-friendly than the cryogen cooling method. This paper describes the thermal and structural analysis of a cryogenic conduction cooling system for a 400 MHz HTS NMR magnet, focusing on the magnet assembly. The highly thermo-conductive cooling plates between HTS double pancake coils are used to transfer the heat generated in coils, namely Joule heating at lap splice joints, to thermal link blocks and finally the cryocooler. The conduction cooling structure of the HTS magnet assembly preliminarily designed is verified by thermal and structural analysis. The orthotropic thermal properties of the HTS coil, thermal contact resistance and radiation heat load are considered in the thermal analysis. The thermal analysis confirms the uniform temperature distribution for the present thermal design of the NMR magnet within 0.2 K. The mechanical stress and the displacement by the electromagnetic force and the thermal contraction are checked to verify structural stability. The structural analysis indicates that the mechanical stress on each component of the magnet is less than its material yield strength and the displacement is acceptable in comparison with the magnet dimension.

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高温超导核磁共振磁体低温传导冷却系统的热与结构分析

超导核磁共振磁体采用液氦等冷媒进行冷却。然而，使用低温冷却器的传导冷却方法使核磁共振磁体的低温冷却系统比冷冻冷却方法更紧凑和用户友好。本文介绍了400 MHz高温超导核磁共振磁体低温传导冷却系统的热学和结构分析，重点介绍了磁体组件。高温超导双煎饼线圈之间的高导热冷却板用于将线圈中产生的热量，即搭接接头处的焦耳加热传递给热链接块，最后传递给制冷机。通过热分析和结构分析，验证了初步设计的高温超导磁体组件的传导冷却结构。热分析中考虑了高温超导线圈的正交各向异性、接触热阻和辐射热负荷。热分析证实了本设计的核磁共振磁体在0.2 K范围内温度分布均匀。通过对机械应力、电磁力和热收缩作用下的位移进行校核，验证结构的稳定性。结构分析表明，磁体各部件的机械应力小于其材料屈服强度，与磁体尺寸相比位移是可以接受的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Progress in Superconductivity and Cryogenics PHYSICS, APPLIED-

CiteScore

0.40

自引率

33.30%

发文量

期刊介绍： Progress in Superconductivity and Cryogenics is the official publication of The Korea Institute of Applied Superconductivity and Cryogenics and the Korean Superconductivity Society. It was launched in 1999, and accepts original research articles and review papers on research on superconductivity and related fields of physics, electronic devices, materials science, large-scale applications for magnets, power and energy, and cryogenics. The Journal is published quarterly in March, June, September, and December each year. Supplemental issues are published occasionally. The official title of the journal is ''Progress in Superconductivity and Cryogenics'' and the abbreviated title is ''Prog. Supercond. Cryog.'' All submitted manuscripts are peer-reviewed by two reviewers. The text must be written in English. All the articles in this journal are KCI and SCOPUS as of 2015. The URL address of the journal is http://psac.kisac.org where full text is available. This work was supported by the Korean Federation of Science and Technology Societies grant funded by the Korea government.