论文标题
爱丽丝升级4跑4和5
ALICE upgrades for Run 4 and Run 5
论文作者
论文摘要
鉴于LHC的Run 4（目前定于2029年开始），Alice正在进行多次升级，以进一步扩展其物理范围。为了改善依赖次级顶点的重味强体和二元测量测量，需要减少内部跟踪系统最内层的材料预算。这可以通过弯曲的像素传感器来实现，并以集成电源线和数据总线排列在半缸形状中，从而可以摆脱大多数支撑结构和水冷却。此外，已经提出了一种新的远期量热仪（焦点），覆盖$ 3.2 <η<5.8 $的伪特性，通过提示光子生产来衡量Small-X（降至$ 10^{ - 6} $）Gluon分布。该焦点将由高度颗粒状的Si+W电磁热量表组成，并结合传统的采样辐射量激量热计，并将显着增强爱丽丝的范围，用于与介子，光子和JET的涵盖和相关测量。对于Run 5及以后，已经提出了Alice 3项目。它由基于整体硅传感器的新型紧凑型检测器组成，在顶点附近具有超薄层，高读数速率功能，出色的指向分辨率，出色的跟踪和粒子识别，对较大的接受度。这样的检测器可以实现丰富的物理程序，从超低横向动量的电磁探针到魅力和美容部门的精确物理。为了鉴定粒子，可以预见一系列探测器系统：飞行时间系统的组合，戒指成像的Cherenkov检测器，电磁热量计，MUON识别仪和用于超短柔soft光子的专用前进探测器。在这些程序中，升级计划将与R \＆d在其3和焦点上的状态以及Alice 3的概念和要求一起显示。
In view of Run 4 at the LHC, presently scheduled from 2029 onwards, ALICE is pursuing several upgrades to further extend its physics reach. In order to improve heavy-flavor hadron and dielectron measurements which rely on secondary vertexing, a reduction of the material budget of the innermost layers of the Inner Tracking System is needed. This can be achieved with bent pixel sensors, arranged in half-cylinder shapes with integrated power lines and data buses, allowing to get rid of most of the supporting structure and of the water cooling. Moreover, a new Forward Calorimeter (FoCal), covering pseudorapidities of $3.2<η<5.8$, has been proposed to measure small-x (down to $10^{-6}$) gluon distributions via prompt photon production. The FoCal will be composed of a highly granular Si+W electromagnetic calorimeter combined with a conventional sampling hadronic calorimeter, and will significantly enhance the scope of ALICE for inclusive and correlation measurements with mesons, photons, and jets. For Run 5 and beyond, the ALICE 3 project has been proposed. It consists of a novel compact detector based on monolithic silicon sensors, with ultra-thin layers near the vertex, high readout rate capabilities, superb pointing resolution, excellent tracking and particle identification over a large acceptance. Such a detector enables a rich physics program, ranging from electromagnetic probes at ultra-low transverse momenta to precision physics in the charm and beauty sector. For particle identification, a sequence of detector systems is foreseen: a combination of a Time-Of-Flight system, a Ring-Imaging Cherenkov detector, an electromagnetic calorimeter, a muon identifier, and a dedicated forward detector for ultra-soft photons. In these proceedings, the upgrade plans will be shown together with the status of R\&D on ITS3 and FoCal and with the concepts and requirements of ALICE 3.
