Time Projection Chamber Development for the International Linear Collider

国际直线对撞机（ILC）是下一个在能量前沿研究亚原子物理的世界设施。ILC是一个电子正电子对撞机，最初的碰撞能量为500 GeV，以后可能升级到1 TeV。强有力的科学理由是，ILC将补充大型强子对撞机（LHC）。粒子物理学家确信，在后lhc时代，ILC对于更好地理解亚原子物理学至关重要。ILC的精确测量将补充大型强子对撞机的物理特性，为最近发现的希格斯玻色子以及未来几年可能出现的大型强子对撞机发现提供更多的线索。经过多年全球协调的研发工作，ILC的物理加速器和探测器的建设，ILC社区编写了一份技术设计报告（TDR）。TDR包含东道国对ILC批准作出决定所需的所有信息。鉴于ILC将在日本举办，预计将在2018年做出决定，此后不久将呼吁在ILC进行实验。NSERC项目拨款的申请人是国际大型探测器（ILD）的成员，这是两个批准的ILC探测器概念小组之一，致力于ILC实验的最终设计和建造。ILC探测器的一个关键设计目标是为希格斯玻色子事件产生的高能轻子提供出色的带电粒子跟踪器分辨率。大容量时间投影室（TPC）将用作ILD的主要跟踪器。正在开发用于ILD TPC读出的微模式气体探测器（mpgd），以实现其对4.7m长的TPC中所有轨迹命中要求的100微米横向分辨率目标。加拿大人从一开始就在国际上处于领先地位，他们的贡献得到了国际上的认可。支持者开发了一种新的电荷分散MPGD读出概念，使得带有电阻层的Micromegas模块成为ILD TPC读出的一种选择。在最后一个拨款周期中，在DESY用1米原型机进行的波束测试表明，配备电阻层读出器的MPGD TPC可以达到TDR中指定的分辨率目标。拟议的为期两年的拨款将使我们能够在ILC批准之前完成我们对TPC研发的现有承诺，并允许与其他从事ILC量热学研发的加拿大团体同步参与ILC。在项目的这个阶段，如果ILC要得到日本政府的批准，继续维持ILC TPC的努力对于确保加拿大积极参与ILC至关重要。ILC得到了国际粒子物理界和最近完成的加拿大亚原子物理长期计划2017-2021的大力支持。

The International Linear Collider (ILC) is the next proposed world facility to study subatomic physics at the energy frontier. The ILC is an electron positron collider with collision energy of 500 GeV initially, with the possibility for a later upgrade to 1 TeV. The strong scientific justification is that the ILC would complement the Large Hadron Collider (LHC). Particle physicists are convinced that the ILC will be essential for a better understanding of subatomic physics in the post-LHC era. The ILC with its precision measurements would supplement LHC physics, shedding more light on the recent discovery of the Higgs boson as well as on the future LHC discoveries likely to be made in the coming years. Encompassing many years of globally coordinated R&D effort for the construction of both the accelerator and detectors for physics at ILC, a Technical Design Report (TDR) was prepared by the ILC community. The TDR contains all needed information for the host nation to make a decision on the ILC approval. In the context of the ILC to be hosted in Japan, the decision is expected by 2018, with a call for experiments at ILC shortly thereafter. The applicants for this NSERC Project Grant have been members of the International Large Detector (ILD), one of two approved ILC detector concept groups working toward the final design and construction of the ILC experiments. A critical design goal for ILC detectors is excellent charged particle tracker resolution for energetic leptons from events with a Higgs boson. A large volume Time Projection Chamber (TPC) will be used as the main tracker for the ILD. Micro-Pattern Gas Detectors (MPGDs) are being developed for the ILD TPC readout to achieve its demanding 100-micron transverse resolution goal for all track hits in the 4.7m long TPC. Canadians have been among the leaders in ILD TPC R&D from the very beginning and their contribution has been internationally recognized. The development of a new charge dispersion MPGD readout concept by the proponents led the Micromegas modules instrumented with a resistive layer to become an option being developed for the ILD TPC readout. During the last grant cycle, beam tests with a 1-m prototype at DESY demonstrated that the MPGD TPC equipped with the resistive layer readout could achieve the resolution goals specified in the TDR. The proposed two-year grant will enable us to finalize our existing commitments for the TPC R&D, in time for the ILC approval and to allow the synchronization of the participation in ILD with other Canadian groups engaged in calorimetry R&D for ILC. At this stage of the project, a continued maintenance of the ILD TPC effort is vital to ensure an active participation of Canada in the ILC, if it is going to be approved by the Japanese Government. The ILC is strongly supported by the international particle physics community and by the recently completed Canadian Subatomic Physics Long Range Plan 2017-2021.