Polarization- and Chirp-Controlled Beam Structure Engineering for Efficient Laser Electron Acceleration

Polarization- and Chirp-Controlled Beam Structure Engineering for Efficient Laser Electron Acceleration | 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 Polarization- and Chirp-Controlled Beam Structure Engineering for Efficient Laser Electron Acceleration Hossein Akou This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7656337/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 29 Nov, 2025 Read the published version in Optical and Quantum Electronics → Version 1 posted 15 You are reading this latest preprint version Abstract This paper presents a comprehensive numerical study of vacuum electron acceleration driven by Hermite–cosh–Gaussian (HcG) laser pulses, emphasizing beam structure engineering as a route to enhance the efficiency and scalability of direct laser acceleration (DLA). The combined influence of the Hermite index (s), cosh–Gaussian decentered parameter (b), linear chirp parameter (C), and polarization state is systematically analyzed. The simulations reveal three distinct acceleration stages governed by a phase synchronization process, with the quasi-static phase identified as the regime of maximal energy transfer. Importantly, it is demonstrated that an optimally tailored linear chirp can dramatically enhance energy gain, while tuning the paramet,er b leads to improved field localization and extended synchronism, yielding peak energies up to ~8 "GeV" . A decisive role of polarization is revealed: circular polarization not only maximizes energy transfer but also suppresses sensitivity to the initial phase, thereby ensuring stable and reproducible acceleration. Furthermore, higher-order HcG modes are shown to expand the effective injection window, allowing even off-axis electrons to reach substantial energies. These findings demonstrate that chirped HcG beams, through polarization- and chirp-controlled beam structure engineering, offer a versatile and efficient driver for compact next-generation laser-based accelerators. Vacuum Laser Acceleration Hermite–Cosh–Gaussian Beams Chirped Laser Pulses Polarization Effects Acceleration Efficiency Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 29 Nov, 2025 Read the published version in Optical and Quantum Electronics → Version 1 posted Editorial decision: Revision requested 19 Oct, 2025 Reviews received at journal 17 Oct, 2025 Reviews received at journal 12 Oct, 2025 Reviews received at journal 11 Oct, 2025 Reviews received at journal 06 Oct, 2025 Reviews received at journal 29 Sep, 2025 Reviewers agreed at journal 28 Sep, 2025 Reviewers agreed at journal 24 Sep, 2025 Reviewers agreed at journal 24 Sep, 2025 Reviewers agreed at journal 23 Sep, 2025 Reviewers agreed at journal 23 Sep, 2025 Reviewers invited by journal 23 Sep, 2025 Editor assigned by journal 19 Sep, 2025 Submission checks completed at journal 19 Sep, 2025 First submitted to journal 19 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. 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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-7656337","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":524412129,"identity":"d7465075-6ba4-444e-a865-7feb6d8afc43","order_by":0,"name":"Hossein 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