Canada's contribution to AWAKE - a proton-driven plasma wakefield experiment at CERN

加拿大对 AWAKE 的贡献 - 欧洲核子研究中心的质子驱动等离子体尾场实验

• 批准号: SAPPJ-2018-00019
• 负责人: Baartman, Richard
• 金额: $ 1.09万
• 依托单位: TRIUMF
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Project
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=718934
• 关键词: Canada; contribution; AWAKE; proton; driven

Proposal for continuing TRIUMF participation in the AWAKE collaboration, 2018-2021 For the last three years TRIUMF has been an active member of the AWAKE collaboration. a) Operation and service TRIUMF has manufactured, delivered and installed all the equipment it committed to contribute for the AWAKE experiment. Part of the hardware, such as BPM electronics, is a complex, state-of-the-art piece of instrumentation. The AWAKE collaboration expects the TRIUMF group to provide continuous support of the equipment that it has built. This task will require regular travels to CERN to participate in experiment runs, to troubleshoot, and to repair the hardware in case of failures. A few spare parts have also to be procured and built. b) System Upgrade The overall success of the AWAKE experiment depends on the ability to precisely control proton, electron and laser beams in time and space. In particular, the electron beam is expected to transversely overlap with the proton bunch and stay longitudinally behind the laser pulse by a defined amount of time. This task is impossible to perform without proper beam instrumentation. In principle, one can separately measure the position of the proton and electron bunches, since electrons' repetition rate is 10 Hz, while the proton beam is expected only about every 30 seconds. Thus, the electron position can be measured when protons are not available. The valid concern here is that the Coulomb field of the proton bunch will deflect the electrons as they tend to approach and then the electron beam position measured in the absence of the proton bunch will be different from the practically important case when both beams co-propagate together. For this reason it was requested that the two last TRIUMF beam position monitors measure the electron beam position in the presence of proton bunches. c) New diagnostics development for Run 2 Compared to the Run 1 the bunch length is reduced by a factor of 20-30 and to keep the emittance low the bunch charge is correspondingly reduced three times. With such a lower bunch charge the beam position monitor electronics TRIUMF developed for Run 1 will not meet the resolution requirement of 50 micrometers shot-to-shot. Thus, TRIUMF is asked to modify the existing electronics to increase the signal-to-noise ratio. Budget: To support two to three students to work on various aspects of AWAKE beam diagnostics development ($36k for 2 years). To develop and build diagnostics hardware, upgrade the associated electronics and the acquisition system ($117k). Travel funds to participate in experimental runs, operate and service the hardware and travel for collaboration meetings ($24k). Total request: $177k over 3 years. Timely funding of the current proposal will secure a firm presence of TRIUMF, and Canadian Science at large, in this vital area of research for fundamental and applied physics of tomorrow.

关于 2018-2021 年继续 TRIUMF 参与 AWAKE 合作的提案 在过去的三年里，TRIUMF 一直是 AWAKE 合作的积极成员。 a) 运营和服务 TRIUMF 已制造、交付并安装了其承诺为 AWAKE 实验贡献的所有设备。部分硬件（例如 BPM 电子设备）是复杂且最先进的仪器。 AWAKE 合作期望 TRIUMF 集团为其制造的设备提供持续支持。这项任务需要定期前往欧洲核子研究中心参与实验运行、排除故障并在出现故障时修复硬件。还必须采购和建造一些备件。 b) 系统升级 AWAKE实验的整体成功取决于在时间和空间上精确控制质子、电子和激光束的能力。特别是，电子束预计会与质子束横向重叠，并在激光脉冲的纵向后面停留指定的时间。如果没有适当的光束仪器，这项任务是不可能完成的。原则上，我们可以分别测量质子束和电子束的位置，因为电子的重复率为 10 Hz，而质子束预计大约每 30 秒一次。因此，当质子不可用时，可以测量电子位置。这里有效的担忧是，当电子趋近时，质子束的库仑场会使电子偏转，然后在没有质子束的情况下测量的电子束位置将与两束电子束同时传播时的实际重要情况不同一起。因此，要求最后两个 TRIUMF 束位置监视器测量质子束存在时的电子束位置。 c) Run 2 的新诊断开发 与运行 1 相比，束团长度减少了 20-30 倍，并且为了保持较低的发射度，束团电荷相应减少了三倍。 由于束电荷如此低，为运行 1 开发的光束位置监控电子装置 TRIUMF 将无法满足 50 微米逐次射击的分辨率要求。因此，TRIUMF 被要求修改现有的电子设备以提高信噪比。 预算： 支持两到三名学生从事 AWAKE 光束诊断开发的各个方面（两年 3.6 万美元）。 开发和构建诊断硬件，升级相关电子设备和采集系统（11.7 万美元）。 用于参加实验运行、操作和维修硬件以及参加协作会议的差旅费（2.4 万美元）。 总请求：3 年 17.7 万美元。 当前提案的及时资助将确保 TRIUMF 和整个加拿大科学界在这一未来基础和应用物理学的重要研究领域中占据稳固地位。