High Energy Cosmic Ray Background for Resonant-Mass Gravitational Wave Antenna

本研究的目的是测量谐振质量型引力波天线在宇宙射线入射下的激发。它将成为高灵敏度实验中引力波搜索的背景。安置在宇宙射线研究所的共振质量引力波天线是对银河系超新星爆发引力波的监测。它有一个高灵敏度的激光干涉传感器来检测质量激发。它由法布里=珀罗干涉仪组成。在本研究中，我们实现了探测器系统稳定、高灵敏度的运行。我们还为事件否决准备了宇宙射线计数器。由于宇宙射线计数器的安装被推迟，我们没有同时测量宇宙射线否决系统和引力波天线的运行，但是当电子外围设备完成后，我们将开始同时运行。本研究中换能器的灵敏度为-10^<-17>m/nuHz。为了保证操作的稳定性，我们对法布里-佩罗腔的透射光强度进行了监测。方向盘的后视镜会根据这个反馈进行调整。在在线数据采集系统中对数据进行实时处理。数据采集系统实时快速显示分析结果，实现了锁相放大器频率的在线调优，实现了相敏测量。本研究的主要目的是在天线外制备宇宙射线计数器。如果可能的话，把量热计放在天线下面是最好的选择。但是由于预算和场地的限制，我们使用带有PMT（光倍增管）的塑料闪烁计数器。检查计数器，并在天线系统周围构建一个设置框架。由于计数器系统的延迟，我们没有测量天线的激励。然而，另一方面，我们在换能器开发方面获得了许多经验。

The aim of this research was a measurement of the excitation of the resonant-mass type gravitational wave antenna due to cosmic ray incident. It will become the background of the gravitational wave search in high sensitivity experiment. The resonant-mass gravitational wave antenna that is settled at institute of cosmic ray research is a monitor for the burst gravitational wave from supernova in our galaxy. It has a high sensitivity laser interferometric transducer to detect mass excitation. It consists of Fabry=Perot interferometer.In this research, we achieved stable and high sensitivity operation of the detector system. We also prepare the cosmic ray counters for incident veto. We did not measured cosmic ray veto system and gravitational wave antenna operation simultaneously, since an installation of the cosmic ray counter is delayed, however we will start simultaneous operation when the electronics peripherals will be completed.The sensitivity of the transducer is -10^<-17>m/nuHz in this research. To make the operation stable, we monitor an intensity of transmission light of Fabry=Perot cavity. The steering mirrors are tuned with this feedback.We made real time data processing in on-line data acquisition system. The data acquisition system shows the quick analysis result in real time, and it made possible to tune the lock-in amplifier frequency for phase sensitive measurement with on-line.For main purpose of this research, we preparing cosmic ray counter beyond the antenna. If possible, to place calorimeter under the antenna is best choice. However due to budget and site limitation, we use plastic scintillation counters with PMT(Photo Multiplier Tube). Counters are checked, and a frame for setting is constructed around the antenna system.Due to delay of counter system, we did not measure the excitation of the antenna. However, on the other hand, we got many experiences with transducer development.