Time Projection Chamber Development for the International Linear Collider

国际直线对撞机(ILC)是下一个被提议的在能源前沿研究亚原子物理的世界设施。ILC是一台电子正电子对撞机，初始碰撞能量为500GeV，以后可能升级到1TeV。强有力的科学证明是，ILC将补充大型强子对撞机(LHC)。粒子物理学家确信，在后大型强子对撞机时代，ILC对于更好地理解亚原子物理将是必不可少的。ILC的精确测量将补充大型强子对撞机物理学，为最近发现的希格斯玻色子以及未来几年可能发现的大型强子对撞机提供更多信息。经过多年的全球协调研发工作，ILC为建造加速器和物理探测器，由ILC社区编写了一份技术设计报告(TDR)。TDR包含东道国就批准国际法公约作出决定所需的所有信息。在即将在日本主办的国际法委员会的背景下，这一决定预计将于2018年作出，不久之后将呼吁在国际法委员会进行试验。NSERC项目补助金的申请者是国际大型探测器(ILD)的成员，ILD是两个获得批准的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对来自希格斯玻色子事件的高能轻子进行出色的带电粒子跟踪器分辨率。将使用大体积时间投影室(TPC)作为ILD的主跟踪器。正在为ILD TPC读数开发微图案气体探测器(MPGD)，以实现4.7米长TPC中所有磁道命中的高要求的100微米横向分辨率目标。加拿大人从一开始就是ILD TPC研发的领导者之一，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，使得配备了电阻层的Micromegas模块成为ILD TPC读出的一种正在开发的选项。在上一个授权周期中，在DESY的1-m原型上进行的束流测试表明，配备了电阻层读出的MPGD TPC可以实现TDR中规定的分辨率目标。拟议的两年拨款将使我们能够及时敲定我们对TPC研发的现有承诺，以便ILC获得批准，并允许参与ILD的加拿大其他从事ILC热量测量研发的团体同步进行。在该项目的这个阶段，如果要得到日本政府的批准，继续维持国际法委员会的TPC努力对于确保加拿大积极参与国际法委员会至关重要。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程计划2017-2021年的大力支持。

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.