Control and Manipulation of Microwave Polarization, and Power of a frequency-agile 198 GHz Gyrotron for Magnetic Resonance

Control and Manipulation of Microwave Polarization, and Power of a frequency-agile 198 GHz Gyrotron for Magnetic Resonance | 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 Control and Manipulation of Microwave Polarization, and Power of a frequency-agile 198 GHz Gyrotron for Magnetic Resonance Marthe Millen, Ioannis Gr. Pagonakis, Snaedís Björgvinsdóttir, and 2 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-2271213/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 22 Feb, 2023 Read the published version in Journal of Infrared, Millimeter, and Terahertz Waves → Version 1 posted 7 You are reading this latest preprint version Abstract The measurement and manipulation of the microwave polarization emitted from a frequency-agile 198 GHz gyrotron for dynamic nuclear polarization (DNP) is demonstrated. In general, gyrotrons emit linearly polarized radiation, yet in this case elliptical polarization is observed from the 198 GHz gyrotron window. Indeed, half of the microwave power is circularly polarized while the other half is linearly polarized with a polarization of 60° with respect to the horizontal plane. For optimal use of microwave power for DNP experiments, the elliptical polarization from the gyrotron is converted into circular polarization with a Martin-Puplett interferometer (MPI). The dependence of the DNP enhancement on the microwave polarization was investigated by modifying the microwave polarization with the MPI. In addition the MPI can generate a linearly polarized beam, which holds promise for future development of induction-mode electron spin detected experiments. Dynamic nuclear polarization Gyrotron Martin-Puplett interferometer Microwave polarization Solid-state Nuclear Magnetic Resonance Full Text Additional Declarations No competing interests reported. Supplementary Files MMSupportingInformation.pdf Cite Share Download PDF Status: Published Journal Publication published 22 Feb, 2023 Read the published version in Journal of Infrared, Millimeter, and Terahertz Waves → Version 1 posted Editorial decision: Major revision 28 Nov, 2022 Reviews received at journal 22 Nov, 2022 Reviewers agreed at journal 17 Nov, 2022 Reviewers invited by journal 17 Nov, 2022 Editor assigned by journal 16 Nov, 2022 Submission checks completed at journal 15 Nov, 2022 First submitted to journal 14 Nov, 2022 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. 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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-2271213","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":152477070,"identity":"2df2fa84-a761-42fd-9dbd-a45a88e4ae3e","order_by":0,"name":"Marthe Millen","email":"","orcid":"","institution":"ETH Zurich","correspondingAuthor":false,"submittingAuthor":false,"prefix":"","firstName":"Marthe","middleName":"","lastName":"Millen","suffix":""},{"id":152477071,"identity":"9c9df246-62df-44e2-bc18-3d5e6f0c0d1a","order_by":1,"name":"Ioannis Gr. 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