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arXiv 1604.05045physics.ins-dethep-ex
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LHCb VELO升级

LHCb VELO Upgrade

Karol Hennessy

摘要:

计划于2021年开始的LHC Run-III的LHCb实验的升级将使实验转变为一个以40 MHz事件速率读取完整探测器的无干扰系统。所有数据简化算法将在高级软件场中执行,使检测器能够在$2\times10^{33} \mathrm{cm}^{-2}\mathrm{s}^{-1}$的光度下运行。顶点探测器(VELO)是围绕相互作用区域的硅顶点探测器。电流检测器将被一个混合像素系统取代,该系统配备了能够以40 MHz读出的电子设备。升级后的VELO将为软件触发器提供快速模式识别和轨迹重建。硅像素传感器具有$55\times55 μm^{2}$间距,并由Timepix/Medipix系列的VeloPix ASIC读出。最热区域的像素命中率为900 Mhits/s,升级后的VELO的总数据速率超过3 Tbit/s。探测器模块位于单独的真空中,通过薄的定制箔与束真空分开。箔将通过铣削制造,并可能通过化学蚀刻进一步减薄。通过使用在400 $μm$厚的硅衬底内的微通道中循环的蒸发CO $_2$冷却剂,材料预算将最小化。描述了VELO升级的现状,并介绍了辐照传感器组件运行的最新结果。

英文摘要:

The upgrade of the LHCb experiment, scheduled for LHC Run-III, scheduled to start in 2021, will transform the experiment to a trigger-less system reading out the full detector at 40 MHz event rate. All data reduction algorithms will be executed in a high-level software farm enabling the detector to run at luminosities of $2\times10^{33} \mathrm{cm}^{-2}\mathrm{s}^{-1}$. The Vertex Locator (VELO) is the silicon vertex detector surrounding the interaction region. The current detector will be replaced with a hybrid pixel system equipped with electronics capable of reading out at 40 MHz. The upgraded VELO will provide fast pattern recognition and track reconstruction to the software trigger. The silicon pixel sensors have $55\times55 μm^{2}$ pitch, and are read out by the VeloPix ASIC, from the Timepix/Medipix family. The hottest region will have pixel hit rates of 900 Mhits/s yielding a total data rate of more than 3 Tbit/s for the upgraded VELO. The detector modules are located in a separate vacuum, separated from the beam vacuum by a thin custom made foil. The foil will be manufactured through milling and possibly thinned further by chemical etching. The material budget will be minimised by the use of evaporative CO$_2$ coolant circulating in microchannels within 400 $μm$ thick silicon substrates. The current status of the VELO upgrade is described and latest results from operation of irradiated sensor assemblies are presented.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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