Development of tungsten wire-scintillating fiber sampling calorimeter

电磁量热仪利用探测器内部产生的电磁簇射来测量入射伽马能量。最近的粒子物理实验不断地需要更大、更稠密的量热计来探测更高能量的伽马。我们尝试制作一种新的采样量热计，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。这是一个吸引人的特点，这种光纤采样量热计使我们能够优化辐射长度(热计的大小)和特定实验的可见光比。电磁量热计利用探测器内部产生的电磁簇射来测量入射伽马能量。最近的粒子物理实验不断地需要更大、更稠密的量热计来探测更高能量的伽马。我们尝试制作一种新的采样量热计，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。这是一个吸引人的特点，这种光纤采样量热计使我们能够优化辐射长度(热量计的大小)和特定实验的可见度比。2007财年，我们在东北大学核科学实验室使用正电子束对该模块进行了测试。在正电子能量范围为200 MeV~800 MeV的情况下，用闪光模数转换模块将其能量沉积记录到测试模块中。用常用函数很好地表达了分辨率对能量的依赖关系，得到了1GeV伽马能量的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.