第四代ECR(电子回旋共振)离子源高场Nb3Sn磁体1/2长度样机的研制

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中文摘要：中国科学院近代物理研究所正在研发第四代ECR(电子回旋共振)离子源FECR(first 4th generation ECR ion source)。以20 kW/45 GHz微波加热运行为目标，需要研制Nb3Sn超导磁体以实现对所加热等离子体的有效磁场约束。作为首台采用Nb3Sn超导磁体技术的ECR离子源，FECR的主磁场线圈由4套独立的轴向螺线管线圈与1套径向六极线圈所构成，且均采用单股Nb3Sn线绕制而成，这给线圈的加工、冷体装配、磁体的失超保护等环节带来一系列挑战。为使磁体能在高场、高应力作用下安全稳定运行，项目采用基于铝壳体结构与bladder & key的预紧应力控制技术，完成了一套半尺寸冷体样机的研发。该样机已完成4。2 K低温测试。本项研究的核心关键问题与挑战是如何在复杂的高精度机械装配与高电流强磁场励磁过程中实现对易碎Nb3Sn导线的有效保护。本篇文章中，我们将阐述如何设计、研制、装配及测试工作于复杂磁场与应力环境的高性能Nb3Sn六极磁铁。针对于单个六极线圈的测试，我们设计研发了一种称为"Mirror"结构的测试工装。论文中会详细论述基于壳层结构与bladder & key的装配预紧技术在半尺寸样机上的应用效果。同时，论文对在半尺寸样机上观察到的强烈磁通跳跃现象和它对失超探测保护的严峻挑战问题及相关解决或规避方案进行相关论述。

外文标题：Development of a 1/2-length prototype high field Nb3Sn magnet for the 4th generation ECR ion source

外文摘要：A 4th generation ECR(electron cyclotron resonance)ion source FECR(first 4th generation ECR ion source)is under construction at IMP(Institute of Modern Physics).Aiming to be operated with the microwave power of 20 kW at 45 GHz,a fully superconducting Nb3Sn magnet is to be developed to realize the optimum ECR plasma confinement.As the first superconducting ECR magnet that utilizes single-strand Nb3Sn(niobium three tin)wire for the winding of coils consisting of 4 sets of axial solenoids and one sextupole,it poses many challenges in the coil fabrication,cold mass assembly,magnet quench protection,and so on.With a shell-based structure and bladder-and-key technology,we have completed a 1/2-length FECR cold mass prototype.It has been fully tested when immersed in 4.2 K liquid helium.The critical issue in this work is to keep the brittle Nb3Sn wire safe during the complicated mechanical process and protect it against the high current high magnetic field excitation.In this paper,we will report on the details of how to design,fabricate,assemble,and test a high-performance Nb3Sn sextupole with the existence of sophisticated magnetic fields and stresses.The successful test of a high-current sextupole coil in a so-called mirror structure will be reported.The application of the bladder-and-key structure to the prototype and the performance will be presented.This research has also tackled the solutions to mitigate very intense flux jump that has caused severe challenges to quench detection and protection.

外文关键词：

Superconducting magnetsSextupole coilNb3Sn wireECRMirror structureBladder-and-key technologyFlux jump

作者：

孙良亭、吴巍、吴北民、陈玉泉、朱丽、欧贤金、郑石钧、梅恩铭、关明智、辛灿杰、王旭东、卢旺、任文辉、赵红卫

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作者单位：

Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China

School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China

Advanced Energy Science and Technology Guangdong Laboratory Huizhou 516000,China

关键词：

Superconducting magnets Sextupole coil Nb3Sn wire ECR Mirror structure Bladder-and-key technology Flux jump

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaKey Scientific Instruments Development Program of CASKey Projects of Guangdong Basic and Applied Basic Research Fund Joint Fund

项目编号：

114279041202550612172357GJJSTD202100072022B1515120051

出版年：

2024

DOI：

10.1007/s10409-023-23376-x

力学学报(英文版)

CSTPCD

影响因子：0.363

ISSN：0567-7718

年,卷(期)：2024.40(4)