Research and Development on the Replacement ATLAS Tracker Required for a High Luminosity Upgrade to the LHC

这是向PPARC提出的一项为期3年的研发计划，旨在回答与欧洲核子研究中心(CERN)大型强子对撞机(LHC)ATLAS实验的替代跟踪器设计相关的关键问题。为了进一步提高大型强子对撞机在最小尺度上发现和研究基础物理的能力，建议延长大型强子对撞机的运行时间，并在2014年开始长期关闭后大幅提高碰撞率。为了维持ATLAS在这一新的数据采集阶段的性能，有必要更换实验的中心部件，该部件跟踪大型强子对撞机碰撞中产生的带电粒子的轨迹。这种新的‘跟踪器’将需要新的技术，以承受与更大的碰撞速率相关的辐射通量的大幅增加，同时仍然以与大型强子对撞机升级之前相同的精度测量单位时间内更多的带电粒子数量。该项目将开发这些技术，并将它们纳入替换跟踪器的布局中，以满足物理性能、辐射耐受性和其他限制的所有要求。

This is a proposal to PPARC for a 3 year R&D programme aimed at answering key questions associated with the design of a replacement tracker for the ATLAS experiment at the Large Hadron Collider (LHC) at CERN. In order to increase further the ability of the LHC to discover and study fundamental physics at the smallest scales, it is proposed to extend LHC running and to greatly increase the collision rate after a long shutdown starting in 2014. To maintain the performance of ATLAS in this new phase of data-taking it will be necessary to replace the central component of the experiment which tracks the trajectories of charged particles produced in LHC collisions. This new 'tracker' will require novel technologies in order to withstand the much increased radiation flux associated with the greater collision rate and yet still measure the much larger numbers of charged particles per unit time with the same precision as will be obtained prior to the LHC upgrade. This project will develop these technologies and incorporate them into a layout for the replacement tracker which meets all the requirements imposed by physics performance, radiation tolerance and other constraints.