Operational Validation of a Replacement IGBT for the High Voltage Converter Modulator in a Proton Accelerator at KAERI

Operational Validation of a Replacement IGBT for the High Voltage Converter Modulator in a Proton Accelerator at KAERI | 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 Operational Validation of a Replacement IGBT for the High Voltage Converter Modulator in a Proton Accelerator at KAERI Hae-Seong Jeong This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8453629/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 9 You are reading this latest preprint version Abstract A replacement Insulated Gate Bipolar Transistor (IGBT) for the High Voltage Converter Modulator (HVCM) used in the KAERI 100-MeV proton linear accelerator was evaluated following the discontinuation of the original device. The candidate IGBT was assessed through a structured framework combining off-line switch-plate testing and on-line operation in the HVCM driving three klystrons simultaneously. Off-line measurements clarified differences in switching behavior and loss characteristics, while on-line measurements confirmed stable pulse generation under nominal operating conditions. Although the candidate device exhibited a modest increase in total loss energy, its lower junction-to-case thermal resistance resulted in a comparable junction temperature rise. Continuous operation since August 2025 without IGBT-related faults further demonstrates the suitability and long-term reliability of the replacement device in an actual accelerator environment. High voltage converter modulator IGBT replacement switching loss thermal resistance Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Review Version 1 posted Editorial decision: Revision requested 28 Jan, 2026 Reviews received at journal 25 Jan, 2026 Reviews received at journal 25 Jan, 2026 Reviewers agreed at journal 20 Jan, 2026 Reviewers agreed at journal 19 Jan, 2026 Reviewers invited by journal 19 Jan, 2026 Editor assigned by journal 19 Jan, 2026 Submission checks completed at journal 30 Dec, 2025 First submitted to journal 26 Dec, 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. 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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-8453629","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":577233473,"identity":"3ad209ad-e87c-4620-a5e6-f7c3115ee9d8","order_by":0,"name":"Hae-Seong 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The candidate IGBT was assessed through a structured framework combining off-line switch-plate testing and on-line operation in the HVCM driving three klystrons simultaneously. Off-line measurements clarified differences in switching behavior and loss characteristics, while on-line measurements confirmed stable pulse generation under nominal operating conditions. Although the candidate device exhibited a modest increase in total loss energy, its lower junction-to-case thermal resistance resulted in a comparable junction temperature rise. Continuous operation since August 2025 without IGBT-related faults further demonstrates the suitability and long-term reliability of the replacement device in an actual accelerator environment.\u003c/p\u003e","manuscriptTitle":"Operational Validation of a Replacement IGBT for the High Voltage Converter Modulator in a Proton Accelerator at KAERI","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2026-01-21 15:01:58","doi":"10.21203/rs.3.rs-8453629/v1","editorialEvents":[{"type":"communityComments","content":0},{"type":"decision","content":"Revision requested","date":"2026-01-29T03:03:13+00:00","index":"","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2026-01-26T04:24:02+00:00","index":"hide","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2026-01-25T11:33:09+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"6768897175388780031300395527949472967","date":"2026-01-20T05:40:51+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"75397555092211707020596361808939525699","date":"2026-01-20T04:02:34+00:00","index":"hide","fulltext":""},{"type":"reviewersInvited","content":"","date":"2026-01-20T01:36:19+00:00","index":"","fulltext":""},{"type":"editorAssigned","content":"","date":"2026-01-20T01:34:00+00:00","index":"","fulltext":""},{"type":"checksComplete","content":"","date":"2025-12-30T23:54:07+00:00","index":"","fulltext":""},{"type":"submitted","content":"Journal of the Korean Physical Society","date":"2025-12-26T08:25:30+00:00","index":"","fulltext":""}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"journal-of-the-korean-physical-society","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"","sideBox":"Learn more about [Journal of the Korean Physical Society](https://link.springer.com/journal/40042)","snPcode":"40042","submissionUrl":"https://submission.springernature.com/new-submission/40042/3","title":"Journal of the Korean Physical Society","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"stoa","reportingPortfolio":"Springer Hybrid","inReviewEnabled":true,"inReviewRevisionsEnabled":false}}],"origin":"","ownerIdentity":"7b6536eb-48e4-47be-a2ef-6d9bbcaa1b68","owner":[],"postedDate":"January 21st, 2026","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"under-review","subjectAreas":[],"tags":[],"updatedAt":"2026-02-10T01:38:47+00:00","versionOfRecord":[],"versionCreatedAt":"2026-01-21 15:01:58","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-8453629","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-8453629","identity":"rs-8453629","version":["v1"]},"buildId":"XKTyCvWXoU3ODBz1xrDgd","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}