Design and Experimental Study of a Thermosiphon-Based Passive Heat Switch in an Integrated Adiabatic Demagnetization and Dilution Refrigerator System

Design and Experimental Study of a Thermosiphon-Based Passive Heat Switch in an Integrated Adiabatic Demagnetization and Dilution Refrigerator System | 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 Short Report Design and Experimental Study of a Thermosiphon-Based Passive Heat Switch in an Integrated Adiabatic Demagnetization and Dilution Refrigerator System Byeungcheol An, Minseung Ku, Jaehwan Jeong, Sangkwon Jeong This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7902821/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 01 Apr, 2026 Read the published version in Journal of Low Temperature Physics → Version 1 posted 13 You are reading this latest preprint version Abstract This study proposes a thermal connection/isolation strategy to achieve less than 1 K pre-cooling required for Dilution Refrigerator (DR) operation in an integrated cryogenic system composed of a 4 K GM cryocooler, evaporative cooler, an Adiabatic Demagnetization Refrigerator(ADR), and a DR. We install a gravity-assisted thermosiphon-based passive heat switch (PHS) above the Gadolinium Gallium Garnet ADR stage, above the Still, and above the Mixing Chamber (MXC). An energy-balance model was used to estimate the attainable temperatures of the refrigeration chain, whereas convection and conduction models were used to design the PHS. In the OFF mode, considering conduction, the lower boundary warms from 2.2 K to 3.0 K in approximately 1.7 h, and the initial conduction heat inflow is estimated at ~ 319 µW—sufficiently low relative to the preparation time between cycles, indicating adequate thermal isolation. In the ON mode, a natural-convection correlation yields an effective heat transport of 11 mW, corresponding to a switching performance ratio about 36 times higher than in the OFF state. Experimentally, the Still pressure of 1.6 kPa was achieved, confirming the conceptual validity of the thermosiphon PHS. These results provide practical guidance for DR-interface design and robust pre-cooling in systems with small He-3 inventory, especially when combined with MXC pre-cooling pathway optimization and reduction of parasitic heat loads. Cryogenics Adiabatic Demagnetization Refrigerator Dilution Refrigerator Passive Heat Switch Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 01 Apr, 2026 Read the published version in Journal of Low Temperature Physics → Version 1 posted Editorial decision: Revision requested 02 Jan, 2026 Reviews received at journal 31 Dec, 2025 Reviewers agreed at journal 16 Dec, 2025 Reviewers agreed at journal 16 Dec, 2025 Reviews received at journal 08 Nov, 2025 Reviews received at journal 04 Nov, 2025 Reviewers agreed at journal 30 Oct, 2025 Reviewers agreed at journal 25 Oct, 2025 Reviewers agreed at journal 25 Oct, 2025 Reviewers invited by journal 23 Oct, 2025 Editor assigned by journal 22 Oct, 2025 Submission checks completed at journal 20 Oct, 2025 First submitted to journal 20 Oct, 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-7902821","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Short Report","associatedPublications":[],"authors":[{"id":538615457,"identity":"5a1f7176-0232-441c-8ffb-cdcd676291f2","order_by":0,"name":"Byeungcheol An","email":"","orcid":"","institution":"Korea Advanced Institute of Science and Technology","correspondingAuthor":false,"prefix":"","firstName":"Byeungcheol","middleName":"","lastName":"An","suffix":""},{"id":538615458,"identity":"585d103b-8605-4bc4-ba9e-aa5c0d344dcd","order_by":1,"name":"Minseung Ku","email":"","orcid":"","institution":"Korea Advanced Institute of Science and 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