发表机构
Brookhaven National Laboratory（布鲁克海文国家实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文针对EIC电子储存环，设计并优化了束流准直器，采用集成方法平衡拦截效率、阻抗和热机械鲁棒性，选定Al2219-T62材料，提出70 mm锥形设计，满足机器保护要求。
AI 中文摘要
本文介绍了电子-离子对撞机（EIC）电子储存环（ESR）束流准直器的设计与优化。准直器必须有效拦截杂散束流粒子，同时保持可接受的束流耦合阻抗，承受快速意外束流撞击，并耐受稳态束流感应加热。本文开发了一种结合束流损失跟踪、电磁簇射模拟、热机械分析和阻抗计算的集成设计方法，并针对已发表的模拟和束流撞击实验进行了基准测试。对候选吸收体材料的比较表明，Al2219-T62在束流撞击鲁棒性、导热性和导电性、机械强度以及超高真空兼容性方面提供了有利的平衡。对于ESR在10 GeV下的终极束团电荷28 nC，在所考虑的参考撞击条件下，Al2219-T62钳口在约50个完全拦截的束团内保持在所采用的实际热冲击阈值以下，并在约100个束团内保持在局部熔化阈值以下。这些结果为机器保护要求提供了工程输入，要求在几个机器周转内完成完整的保护响应。吸收体尖端长度的优化产生了一个70 mm锥形钳口，平衡了准直性能、束流撞击鲁棒性和阻抗。最终设计保持了可接受的阻抗裕度，并在保守的3.6 kW束流感应加热场景下，保持在屈服强度和极限抗拉强度以下。这些结果建立了ESR准直器的基线设计，以及一种用于评估高电流电子储存环中准直器鲁棒性的基准方法。
英文摘要
The design and optimization of a beam collimator for the Electron Storage Ring (ESR) of the Electron-Ion Collider (EIC) are presented. The collimator must efficiently intercept stray beam particles while maintaining acceptable beam coupling impedance, surviving rapid accidental beam impacts, and withstanding steady-state beam-induced heating. An integrated design approach combining beam-loss tracking, electromagnetic-shower simulations, thermomechanical analysis, and impedance calculations is developed and benchmarked against published simulations and beam-impact experiments. A comparison of candidate absorber materials identifies Al2219-T62 as providing a favorable balance of beam-impact robustness, thermal and electrical conductivity, mechanical strength, and ultra-high-vacuum compatibility. For the ultimate ESR bunch charge of 28 nC at 10 GeV, the Al2219-T62 jaw remains below the adopted practical thermal-shock threshold for approximately 50 fully intercepted bunches and below the localized melting threshold for approximately 100 bunches under the reference impact conditions considered. These results provide an engineering input to the machine-protection requirements, for which a complete protection response within several machine turns is required. Optimization of the absorber-tip length yields a 70 mm tapered jaw that balances collimation performance, beam-impact robustness, and impedance. The resulting design maintains acceptable impedance margins and remains below both the yield and ultimate tensile strengths under a conservative 3.6 kW beam-induced heating scenario. The results establish a baseline ESR collimator design and a benchmarked methodology for evaluating collimator robustness in high-current electron storage rings.
Comments26 pages, 12 figures, and 5 tables
