vestiftИзвестия Национальной академии наук Беларуси. Серия физико-технических наукProceedings of the National Academy of Sciences of Belarus. Physical-technical series1561-83582524-244XThe Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"10.29235/1561-8358-2023-68-1-18-23vestift-777Research ArticleМАТЕРИАЛОВЕДЕНИЕ, МЕТАЛЛУРГИЯMATERIALS SCIENCES AND ENGINEERING, METALLURGYУстранение дефектов сварного соединения в ниобиевом сверхпроводящем резонатореElimination of defects in a welded joint in a niobium superconducting resonatorhttps://orcid.org/0000-0002-0143-3962БуринА. А.BurinA. A.

Бурин Александр Алексеевич – научный сотрудник

ул. Академика Купревича 10, 220084, Минск

Alexander А. Burin – Researcher

10, Academician Kuprevich Str., 220084, Minsk

burin1992@mail.ruЗалесскийВ. Г.ZaleskiV. G.

Залесский Виталий Геннадьевич – доктор физико-математических наук, директор

ул. Академика Купревича 10, 220084, Минск

Vitali G. Zaleski – Dr. Sci. (Physics and Mathematics), Director

10, Academician Kuprevich Str., 220084, Minsk

v.zalesski@phti.byhttps://orcid.org/0000-0003-4487-7245ПобольИ. Л.PobolI. L. 

Поболь Игорь Леонидович – доктор технических наук, профессор, начальник отдела

ул. Академика Купревича 10, 220084, Минск

Igor L. Pobol – Dr. Sci. (Engineering), Professor, Head of the Department

10, Academician Kuprevich Str., 220084, Minsk

pobol@phti.byФизико-технический институт Национальной академии наук БеларусиPhysical-Technical Institute of the National Academy of Sciences2023010420236811823Copyright © Бурин А.А., Залесский В.Г., Поболь И.Л., 20232023Бурин А.А., Залесский В.Г., Поболь И.Л.Burin A.A., Zaleski V.G., Pobol I.L.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://vestift.belnauka.by/jour/article/view/777

Исследованы возможные причины появления дефектов при сварке ниобиевого сверхпроводящего коаксиального полуволнового резонатора (HWR), которые заключаются в отклонении формы свариваемой поверхности от заданной, в отклонении угла падения луча от перпендикуляра к свариваемой поверхности, в колебании толщины свариваемых кромок, а также наличие некоторой нестабильности (пульсации) ускоряющего напряжения, токов луча и фокусировки электронно-лучевой пушке. Определены возможности предотвращения появления дефектов при сварке, заключающиеся в регулировании рабочих параметров электронно-лучевой пушки в зависимости от возможных погрешностей при изготовлении и подготовке свариваемых кромок. Изучены методы устранения дефектов при сварке ниобиевого сверхпроводящего коаксиального HWR. Разработан способ ремонта дефектов сварных соединений типа прожогов на исследуемом типе резонатора с использованием электронно-лучевого наплавления. Приведены результаты измерения резонансной частоты HWR до возникновения и после восстановления прожога, которые показали, что заплавление отверстия не привело к изменению электрофизических характеристик. Вакуумные и криогенные испытания при температуре жидкого азота подтвердили герметичность сварных соединений. Полученные результаты могут быть использованы при разработке базовых технологий восстановления и ремонта дорогостоящих и сложных в изготовлении элементов ускорительной техники – сверхпроводящих высокочастотных резонаторов из листового особо чистого ниобия.

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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The authors declare that there are no conflicts of interest present.