The development of a beam position monitor based on Cherenkov diffraction radiation for operation at the AWAKE experiment.

AWAKE合作组织提出了Run 2实验。AWAKE Run 2的目的是演示电子加速到更高能量，同时保持光束质量，即发射度和电荷保存。这个过程应该可以扩展到更长的长度，并且需要等离子细胞技术的重大发展。Run 2的最终目标是充分展示AWAKE方案，从而使基于该方案的粒子物理实验在本世纪20年代后半期成为可能。电子束线的设计和传输以及射频（RF）工程方面的专业知识对于设计能量为O(100) MeV的新型电子束线至关重要。鉴于在Run 1中遇到的挑战，见证电子束的注入被认为是Run 2的关键任务之一，仔细的设计和调试将是必要的。特别是，拥有涉及所有这些方面的专业知识，包括优化和数据采集，将显著提高实验的可能物理输出。RF计时是Run 1的另一个限制，对它的改进已经开始，对Run 2至关重要。控制更精确、在所有轴上更小的电子束，是我们准备好迎接的挑战。我们将运用我们在提供尖端和易于理解的诊断系统方面的知名专业知识，开发一套仪器，使我们能够充分表征加速前后的电子束。这对于将AWAKE方案发展为未来加速器的可用技术至关重要。同样重要的是，一个广泛的诊断套件将使我们能够在获取数据的同时调整和改进实验。因此，我们建议提供仪器来测量初始和加速电子束的发射度；初始电子束和加速电子束以及质子束的长度和横向范围；加速的电子能量分布。

the AWAKE Collaboration is proposing a Run 2 experiment. The aims of the AWAKE Run 2 are to demonstrate acceleration of electrons to higher energies, whilst preserving beam quality, i.e. emittance, and charge preservation. The process should be scalable to longer lengths and will requiresignificant development of plasma cell technology. The ultimate aim of Run 2 is to have demonstrated the AWAKE scheme sufficiently such that particle physics experiments based on this scheme could be possible in the second half of the 2020s.Expertise in design and delivery of electron beamlines as well as radio-frequency(RF) engineering will be crucial to the effort to design a new electron beamline with energies of O(100) MeV. The injection of the witness electron bunch is recognised as one of the key Run 2 tasks given the challenges experienced in Run 1 and careful design and commissioning will be necessary. In particular, having expertise involved in all of these aspects, including optimisation and data taking, will significantly enhance the possible physics output of the experiment. The RF timing is another limitation from Run 1 and improvements to this have already started and will be vital for Run 2. Control of the more precise, significantly smaller in all axes, electron bunches presents a challenge we are well-equipped to meet.We will apply our well-known expertise in delivery of cutting-edge and well-understood diagnostic systems to develop a suite of instrumentation which will allow us to fully characterise the electron beam before and after acceleration. This is essential for the aim of developing the AWAKE scheme into a useable technology for future accelerators. No less important, an extensive diagnostics suite will allow us to tuneand improve the experiment whilst taking data. We therefore propose to deliver instruments to measure the emittance of the initial and accelerated electron bunches; the length and transverse extent of the initial and and accelerated electron bunches as well as the proton bunches; and the accelerated electron energy distribution.