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Beam-dynamics driven design of the LHeC energy-recovery linac

机译：LHeC能量回收直线加速器的光束动力学驱动设计

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The LHeC is envisioned as a natural upgrade of the LHC that aims at delivering an electron beam for collisions with the existing hadronic beams. The current baseline design for the electron facility consists of a multipass superconducting energy-recovery linac (ERL) operating in a continuous wave mode. The unprecedently high energy of the multipass ERL combined with a stringent emittance dilution budget poses new challenges for the beam optics. Here, we investigate the performances of a novel arc architecture based on a flexible momentum compaction lattice that mitigates the effects of synchrotron radiation while containing the bunch lengthening. Extensive beam-dynamics investigations have been performed with placet2, a recently developed tracking code for recirculating machines. They include the first end-to-end tracking and a simulation of the machine operation with a continuous beam. This paper briefly describes the Conceptual Design Report lattice, with an emphasis on possible and proposed improvements that emerged from the beam-dynamics studies. The detector bypass section has been integrated in the lattice, and its design choices are presented here. The stable operation of the ERL with a current up to $ensuremath{sim}150ext{ }ext{ }mathrm{mA}$ in the linacs has been validated in the presence of single- and multibunch wakefields, synchrotron radiation, and beam-beam effects.
机译：LHeC被设想为LHC的自然升级，旨在提供电子束以与现有强子束碰撞。电子设备的当前基线设计包括以连续波模式运行的多程超导能量回收直线加速器（ERL）。多通道ERL前所未有的高能量加上严格的发射率稀释预算给光束光学系统带来了新的挑战。在这里，我们研究了基于柔性动量压实晶格的新型电弧架构的性能，该动量压实晶格在包含束长的同时减轻了同步加速器辐射的影响。已经使用placet2（最近开发的用于再循环机器的跟踪代码）进行了广泛的射束动力学研究。它们包括第一次端到端跟踪和连续光束对机器运行的仿真。本文简要介绍了“概念设计报告”网格，重点介绍了从梁动力学研究中得出的可能和建议的改进。检测器旁路部分已集成在晶格中，此处介绍其设计选择。直线加速器中电流高达$ ensuremath { sim} 150 text {} text {} mathrm {mA} $的情况下，ERL的稳定运行已在单束和多束尾波场，同步加速器的存在下得到验证辐射和束光束效应。

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