通过强流电子束与电离前沿结合，将电荷中和的离子束单能加速至GeV级能量
Monoenergetic acceleration of charge-neutralized ion bunches to GeV-scale energies by the combination of a high-current electron beam and an ionization front
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中文总结 AI 辅助
本文提出对向电离前沿加速（CFA）机制，结合强流相对论电子束与电离前沿，可在数米距离内以超250 MeV/m梯度加速微库仑级离子，为紧凑型重离子加速器研发提供新途径。
中文摘要 AI 辅助
紧凑型重离子加速器在重离子聚变、碳离子放射治疗及抗辐射加固电子器件测试等领域有诸多应用，其需求可通过研发高梯度行波等离子体加速器来满足，该加速器需产生高电荷（约微库仑级）相对论离子束。本文将探讨一种新型离子加速机制——对向电离前沿加速（CFA），该机制利用对向传播的电离前沿（IF）与强流相对论电子束（REB）。理论建模与三维粒子-in-细胞（PIC）模拟表明，采用感应电压叠加器产生的典型REB，使其在经激光电离的充气管中传播，可实现超过约250 MeV/m的加速梯度，同时在数米距离内加速微库仑级离子。本文还讨论了从REB到电磁场再到离子的独特能量转换机制，以及被加速离子的电荷、电荷中和程度、加速梯度和离子能散的限制条件。
英文摘要
Compact heavy ion accelerators have numerous applications, ranging from heavy ion fusion to carbon ion radiotherapy, and testing radiation-hardened electronics. The demand could be met by developing high-gradient traveling wave plasma accelerators of high-charge ($\simμ\mathrm{C}$) relativistic ion beams. We will discuss a novel ion acceleration regime -- Counter-propagating ionization Front Acceleration (CFA) -- utilizing counter-propagating Ionization Front (IF) and high-current Relativistic Electron Beam (REB). Theoretical modeling and 3D PIC simulations demonstrate the possibility of using typical REBs produced by induction voltage adders propagating through a gas-filled tube undergoing laser ionization to achieve acceleration gradients in excess of $\sim 250 {\rm MeV/m}$ while accelerating micro-Coulombs of ions over meters distance. A unique energy conversion mechanism -- from the REB to electromagnetic fields to the ions is discussed, as well as the limits on the accelerated ions charge and the degree of its neutralization, acceleration gradient, and ion energy spread.
