Modern large-area precision tracking detectors require increasing accuracy for the alignment of their components. A novel multi-point laser-alignment system has been developed for such applications, in particular for the muon spectrometer of the ATLAS detector at the Large Hadron Collider. The position of the detector components is monitored with respect to reference laser beams using semi-transparent optical position sensors at multiple consecutive stations. The custom designed sensors work on the principle of silicon strip photodiodes. Two types of transparent strip sensors, based on crystalline and on amorphous silicon as active material, have been studied. The sensors provide two-dimensional position measurement with an order of 1 /spl mu/m resolution uniformly over a transverse range of several centimeters. Light transmission rates of <90% have been achieved at selected wavelengths using laser diodes. This will enable us to place more than 10 sensors along one laser beam. Custom-designed integrated readout electronics are being developed for the sensor systems.
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机译:现代大面积精密跟踪检测器要求提高其组件对准的精度。已经针对这种应用开发了新颖的多点激光对准系统,特别是针对大型强子对撞机的ATLAS检测器的μ子光谱仪。使用半透明的光学位置传感器在多个连续的位置上,相对于参考激光束监视检测器组件的位置。定制设计的传感器根据硅条光电二极管的原理工作。已经研究了两种基于晶体和非晶硅作为活性材料的透明带状传感器。传感器可在几厘米的横向范围内均匀地提供分辨率为1 / spl mu / m的二维位置测量。使用激光二极管在选定的波长下已经实现了<90%的透光率。这将使我们能够沿着一个激光束放置10个以上的传感器。正在为传感器系统开发定制设计的集成读出电子设备。
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