铌超导谐振器焊接接头缺陷的消除

Q4 Medicine
A. A. Burin, V. Zaleski, I. L. Pobol
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引用次数: 0

摘要

研究了铌超导同轴半波谐振器(HWR)在焊接过程中出现缺陷的可能原因,包括焊接表面形状与给定表面的偏差、光束入射角与焊接表面垂直方向的偏差、焊接边缘厚度的波动以及某些不稳定(脉动)加速电压的存在。电子束枪的光束电流和聚焦。确定了防止焊接过程中出现缺陷的可能性,这包括根据焊接边的制造和准备中可能出现的错误来调节电子束枪的操作参数。研究了铌超导同轴HWR焊接缺陷的消除方法。本文提出了一种利用电子束沉积修复所研究谐振器焊接接头烧穿等缺陷的方法。给出了烧透发生前和烧透恢复后的谐振频率测量结果,结果表明,烧透孔的熔化并没有引起电特性的变化。在液氮温度下的真空和低温试验证实了焊接接头的密封性。所得结果可用于修复和修复加速器技术中昂贵和难以制造的元件-高纯度铌片超导高频谐振器的基础技术的开发。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Elimination of defects in a welded joint in a niobium superconducting resonator
The possible reasons for the appearance of defects during welding of a niobium superconducting coaxial halfwave resonator (HWR) are investigated, which consist in the deviation of the shape of the welded surface from the given one, in the deviation of the angle of incidence of the beam from the perpendicular to the welded surface, in fluctuations in the thickness of the welded edges, and also the presence of some instability (pulsation) accelerating voltage, beam currents and focusing of the electron beam gun. The possibilities of preventing the appearance of defects during welding are determined, which consist in regulating the operating parameters of the electron beam gun depending on possible errors in the manufacture and preparation of the welded edges. Methods for elimination of defects in welding of niobium superconducting coaxial HWR are studied. A method has been developed for repairing defects in welded joints such as burn-throughs on the type of resonator under study using electron-beam deposition. The results of measuring the resonant frequency of the HWR before the onset and after the recovery of burn-through are presented, which showed that the melting of the hole did not lead to a change in the electrical characteristics. Vacuum and cryogenic tests at liquid nitrogen temperature confirmed the tightness of the welded joints. The results obtained can be used in the development of basic technologies for the restoration and repair of expensive and difficult-to-manufacture elements of accelerator technology – superconducting high-frequency resonators made of high-purity niobium sheet.
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CiteScore
0.40
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发文量
35
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