Study on readout system of calorimeters for next generation linear collider experiments

本研究旨在评估JLC实验中构建量热计读出系统的最佳参数，以完成对标准模型的验证，并发现标准模型之外的新粒子和现象。为此，我们选择了金属通道节点PMTs （MCD-PMTs）作为传感器并对其进行了研究。此外，我们还研究了通过光纤从量热计传递闪烁光的想法。我们使用蓝色led测试了mcd - pmt。整个装置安装在一个铝制的黑盒子里。mcd - pmt的信号增益是apd的10倍。将mcd - pmt安装在液态氙量热计中，并在JLC实验中测试其在更现实条件下的性能。在JLC实验中，要求传感器具有优于1nsec的时间分辨率来进行束识别。当我们使用mcd - pmt时，发现对于10GeV粒子可以获得足够的时间分辨率。对于1GeV粒子，也可以使用快速响应的信号放大器。在实验装置中安装量热计时，可能会受到杂散磁场的影响，导致信号增益下降。为了解决这个问题，我们研究了一个使用光纤将闪烁光传输到设置外部的想法。我们得出的结论是，使用透明和WLS纤维的组合，可以传输超过10米的光。此外，我们研究了mcd -PMT对磁场的容差，发现如果我们安排PMT的方向，PMT可以在100G下使用。

This study aimes to evaluate optimal parameters for the construction of calorimeter readout system in the JLC experiment that aims complete verification of the starndard model and discovery of new particles and phenomena beyond the starndard model.For this purpose we selected metal channel dynodes PMTs (MCD-PMTs) as a sensor and studied on them. In addtion we examined the idea to transfer scintillation light from the calorimeter via optical fibers.We tested MCD-PMTs using blue LEDs. The whole setup were located in a black box made of aluminum. The signal gain of MCD-PMTs was found to be ten times larger than that of APDs as expected. The MCD-PMTs were installed into a liquid xenon calorimeter and tested to investigate their perfomance in more realistic conditions at JLC experiments.In JLC experiments, it is required that the sensor should have the timing resolution better than 1nsec for bunch identification. When we use MCD-PMTs, it is found that suffucient timing resolution can be obtained for 10GeV priticles. For 1GeV particles it is also possible using signal amplifiers with fast response.When installing calorimeters into the experimental setup, it might be affected by the stray magnetic field and the signal gain could be deteriorated. In order to resolve this problem we examined an idea to transfer scintillation light to the outside of the setup using optical fibers. We concluded that with a combination of clear and WLS fibers it is possible to transfer light for more than 10m. In addition we investigated the tolerance of MCD-PMTs to the magnatec field and found that the PMT can be used in 100G if we arrange the direction of the PMT.