Mechanical Analysis of Helium Inlet and Outlet Structures in the Central Solenoid of the Next-Generation Fully Superconducting Tokamak

Mechanical Analysis of Helium Inlet and Outlet Structures in the Central Solenoid of the Next-Generation Fully Superconducting Tokamak | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Mechanical Analysis of Helium Inlet and Outlet Structures in the Central Solenoid of the Next-Generation Fully Superconducting Tokamak Yi Yu, Houxiang Han This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7533524/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 8 You are reading this latest preprint version Abstract The central solenoid (CS) of a fully superconducting tokamak is a critical component for plasma initiation, shaping, and current drive, where reliable structural performance is essential for safe and stable operation. Helium inlet and outlet ports of the CS coil provide the necessary cooling pathways to maintain superconducting conditions at cryogenic temperatures. However, these structures are exposed to combined electromagnetic, thermal, and mechanical loads during operation, which can induce significant stresses, fatigue, and potential crack propagation. Ensuring their structural integrity is therefore crucial for both performance and safety. A multiphysics coupling analysis was conducted using finite element software to evaluate structural strength, fatigue life, and the maximum allowable initial defect area. The results show that the port structure can safely withstand operational loads while surpassing the device’s lifecycle requirement of 1 × 106 cycles. Superconducting tokamak Helium inlet and outlet structures Finite element analysis Fatigue assessment Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Review Version 1 posted Editorial decision: Revision requested 27 Jan, 2026 Reviews received at journal 25 Dec, 2025 Reviewers agreed at journal 21 Dec, 2025 Reviewers agreed at journal 13 Dec, 2025 Reviewers invited by journal 06 Oct, 2025 Editor assigned by journal 05 Sep, 2025 Submission checks completed at journal 05 Sep, 2025 First submitted to journal 04 Sep, 2025 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-7533524","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":525693287,"identity":"6d8c2bdb-89d0-4e09-b011-919a002dd92d","order_by":0,"name":"Yi Yu","email":"","orcid":"","institution":"Hefei Comprehensive National Science Center (Anhui Energy Laboratory)","correspondingAuthor":false,"prefix":"","firstName":"Yi","middleName":"","lastName":"Yu","suffix":""},{"id":525693288,"identity":"710af110-e47b-46b6-94f1-375e1a0c7272","order_by":1,"name":"Houxiang 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the Next-Generation Fully Superconducting Tokamak","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"journal-of-fusion-energy","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"jofe","sideBox":"Learn more about [Journal of Fusion Energy](http://link.springer.com/journal/10894)","snPcode":"10894","submissionUrl":"https://submission.nature.com/new-submission/10894/3","title":"Journal of Fusion 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Helium inlet and outlet ports of the CS coil provide the necessary cooling pathways to maintain superconducting conditions at cryogenic temperatures. However, these structures are exposed to combined electromagnetic, thermal, and mechanical loads during operation, which can induce significant stresses, fatigue, and potential crack propagation. Ensuring their structural integrity is therefore crucial for both performance and safety. A multiphysics coupling analysis was conducted using finite element software to evaluate structural strength, fatigue life, and the maximum allowable initial defect area. 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