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arXiv 1604.06259physics.ins-det
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60 GHz无线跟踪探测器读出的可行性研究

Feasibility studies for a wireless 60 GHz tracking detector readout

Sebastian Dittmeier, André Schöning, Hans Kristian Soltveit, Dirk Wiedner

摘要:

在高能物理实验中,高粒度硅跟踪探测器产生的数据量对读出系统构成了重大挑战。在高碰撞率下,例如在LHC实验中,只有一小部分数据可以用目前使用的技术读出。为了满足未来或升级实验的要求,需要新的数据传输技术,这些技术在低功率和低材料预算下提供高数据速率。在60 GHz频带或更高频率下工作的无线技术提供高数据速率,因此是通过电缆或光纤进行传统数据传输的有前途的替代方案。使用无线技术,探测器中的电缆和连接器数量可以显著减少。跟踪探测器最大的好处是减少了材料预算,因为次级粒子相互作用较少(多次库仑散射,能量损失等)。总体上提高了跟踪性能。我们提出了关于在60 GHz的无线技术集成到硅跟踪探测器的可行性研究。ATLAS实验的备用硅条模块在60 GHz范围内测量为不透明的。研究了降低链路间串扰的方法。最大可实现的链路密度的估计。它示出,无线链路可以放置为接近2厘米彼此相邻的层距离为10厘米,通过利用以下措施中的一个或几个:高度定向天线,吸收器,线性极化和频率通道。结合这些措施,高达11 Tb/(s $\cdot$ m $^2$)的数据速率区域密度似乎是可行的。此外,两种类型的硅传感器在毫米波辐照下进行了测试。未观察到两种原型的性能劣化。

英文摘要:

The amount of data produced by highly granular silicon tracking detectors in high energy physics experiments poses a major challenge to readout systems. At high collision rates, e.g. at LHC experiments, only a small fraction of data can be read out with currently used technologies. To cope with the requirements of future or upgraded experiments new data transfer techniques are required which offer high data rates at low power and low material budget. Wireless technologies operating in the 60 GHz band or at higher frequencies offer high data rates and are thus a promising upcoming alternative to conventional data transmission via electrical cables or optical fibers. Using wireless technology, the amount of cables and connectors in detectors can be significantly reduced. Tracking detectors profit most from a reduced material budget as fewer secondary particle interactions (multiple Coulomb scattering, energy loss, etc.) improve the tracking performance in general. We present feasibility studies regarding the integration of the wireless technology at 60 GHz into a silicon tracking detector. Spare silicon strip modules of the ATLAS experiment are measured to be opaque in the 60 GHz range. The reduction of cross talk between links is studied. An estimate of the maximum achievable link density is given. It is shown that wireless links can be placed as close as 2 cm next to each other for a layer distance of 10 cm by exploiting one or several of the following measures: highly directive antennas, absorbers, linear polarization and frequency channeling. Combining these measures, a data rate area density of up to 11 Tb/(s $\cdot$ m$^2$) seems feasible. In addition, two types of silicon sensors are tested under mm-wave irradiation . No deterioration of the performance of both prototypes is observed.

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