Development of tungsten wire-scintillating fiber sampling calorimeter

电磁量热计利用探测器内部产生的电磁阵雨测量入射能量。近年来的粒子物理实验不断需要更大、密度更大的量热计来探测更高能量的伽马射线。我们尝试用钨丝来缩短辐射长度，用闪烁光纤来提高闪烁光的收集效率。这种光纤取样量热计的一个吸引人的特点是，它使我们能够优化特定实验的辐射长度（量热计的尺寸）和可见比。电磁量热计利用探测器内部产生的电磁阵雨测量入射能量。近年来的粒子物理实验不断需要更大、密度更大的量热计来探测更高能量的伽马射线。我们尝试用钨丝来缩短辐射长度，用闪烁光纤来提高闪烁光的收集效率。这种光纤取样量热计的一个吸引人的特点是，它使我们能够优化特定实验的辐射长度（量热计的尺寸）和可见比。2007财年，我们在东北大学核科学实验室用正电子束流对该模块进行了测试。正电子能量范围在200MeV ~ 800MeV之间，我们用flash ADC模块记录其能量沉积到测试模块。用常用函数很好地表达了分辨率的能量依赖性，获得了1GeV γ能量的13%。

The electromagnetic calorimeter measures incident gamma energy by using electromagnetic shower generated inside detector. Recent partide physics experiments continuously need larger and denser calorimeter in order to detect higher energy gamma. We tried to make a new sampling calorimeter using tungsten wire to shorten radiation length and scintillating fiber to increase collection efficiency of the scintillation light. It is an attractive feature that this fiber sampling calorimeter enables us to optimize radiation length (size of calorimeter) and visible ratio for particular experiment.The electromagnetic calorimeter measures incident gamma energy by using electromagnetic shower generated inside detector. Recent partide physics experiments continuously need larger and denser calorimeter in order to detect higher energy gamma. We tried to make a new sampling calorimeter using tungsten wire to shorten radiation length and scintillating fiber to increase collection efficiency of the scintillation light. It is an attractive feature that this fiber sampling calorimeter enables us to optimize radiation length (size of calorimeter) and visible ratio for particular experiment.In FY2007, we performed test the module by using positron beam at the Laboratory of Nuclear Science, Tohoku University. With the positrons in energy range of 200MeV to 800MeV, we recorded its energy deposit to the test module with the flash ADC module. The energy dependency of resolution is well expressed by commonly used function and 13% of energy for 1GeV gamma was obtained.