ILC极端前向量热法的固态传感器辐照研究的更新结果
Updated Results of a Solid-State Sensor Irradiation Study for ILC Extreme Forward Calorimetry
摘要：
为国际直线对撞机提出的探测器包括一个钨取样量热计（“BeamCal”），目的是再现从对撞机相互作用点以5至50毫弧度角度出现的电子、正电子和光子簇射。对于这个量热计的最里面的半径，预计最大辐射剂量将达到每年100兆拉德，这主要是由于在ILC束-束相互作用中产生的e+e-“beamstrahlung”对的感应电磁簇射中产生的最小电离电子和正电子。然而，辐射对量热计传感器的损害可能主要是由簇射光子的核相互作用引起的强子，这更有可能导致非电离能量损失，这已被观察到对暴露于强子辐射的传感器造成损害。我们在这里报告的结果SLAC实验T-506，几种不同类型的硅二极管和砷化镓传感器暴露于剂量的辐射诱导的能量为3.5-10.6 GeV的电子淋浴。通过在钨辐射器内的照射下嵌入传感器，暴露并入强子物质，这将潜在地有助于安装在精密采样量热计中的传感器的退化。根据传感器技术，有效的电荷收集，观察到的剂量高达220兆拉德。
英文摘要：
Detectors proposed for the International Linear Collider (ILC) incorporate a tungsten sampling calorimeter (`BeamCal') intended to reconstruct showers of electrons, positrons and photons that emerge from the interaction point of the collider with angles between 5 and 50 milliradians. For the innermost radius of this calorimeter, radiation doses at shower-max are expected to reach 100 MRad per year, primarily due to minimum-ionizing electrons and positrons that arise in the induced electromagnetic showers of e+e- `beamstrahlung' pairs produced in the ILC beam-beam interaction. However, radiation damage to calorimeter sensors may be dominated by hadrons induced by nuclear interactions of shower photons, which are much more likely to contribute to the non-ionizing energy loss that has been observed to damage sensors exposed to hadronic radiation. We report here on the results of SLAC Experiment T-506, for which several different types of silicon diode and gallium-arsenide sensors were exposed to doses of radiation induced by showering electrons of energy 3.5-10.6 GeV. By embedding the sensor under irradiation within a tungsten radiator, the exposure incorporated hadronic species that would potentially contribute to the degradation of a sensor mounted in a precision sampling calorimeter. Depending on sensor technology, efficient charge collection was observed for doses as large as 220 MRad.
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