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

建议继续参加2018年至2021年TRIUMF合作*在过去三年里，TRIUMF一直是AKEVE合作的积极成员。*a)运营和服务*TRIUMF制造、交付和安装了它承诺为EAKE实验做出贡献的所有设备。硬件的一部分，如BPM电子设备，是一件复杂的、最先进的仪器。觉醒协作希望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CERN参加实验运行，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*唤醒实验的整体成功取决于在时间和空间上精确控制质子、电子和激光的能力。特别是，预计电子束将与质子束横向重叠，并纵向落后于激光脉冲一段限定的时间。如果没有适当的束流仪器，这项任务是不可能完成的。原则上，人们可以分别测量质子和电子束的位置，因为电子的重复频率是10赫兹，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。这里有效的担心是，当电子趋于接近时，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实际重要的情况不同，当两束共同传播时。为此，要求最后两台TRIUMF束流位置监测器测量有质子束存在时的电子束位置。*c)Run 2的新诊断开发*与Run 1相比，束团长度减少了20-30倍，并且为了保持低发射度，束团电荷相应减少了三倍。在如此低的束团电荷下，为RUN 1研制的束流位置监测电子设备TRIUMF将无法满足每发50微米的分辨率要求。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唤醒光束诊断开发的各个方面的工作(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)。*·用于参与试验运行、运营和服务硬件的差旅资金以及协作会议差旅(2.4万美元)。*·申请总额：3年17.7万美元。*对当前提案的及时资助将确保TRIUMF和整个加拿大科学在未来基础和应用物理这一关键研究领域的坚定存在。

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.