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

为了在JLC实验中全面验证标准模型，发现标准模型之外的新粒子和新现象，选择金属通道倍增器光电倍增管（MCD-PMT）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传输热量计中闪烁光的想法，并使用蓝色LED测试了MCD-PMT。整个装置位于一个铝制的黑匣子中。MCD-PMT的信号增益被发现比APD的信号增益大十倍。将MCD-PMT安装在液体氙量能器中，并在JLC实验中对MCD-PMT的性能进行了测试。当我们使用MCD-PMT时，发现对于10 GeV的优先级可以获得足够的时间分辨率。对于1GeV的粒子，也可以使用快速响应的信号放大器。当将量热计安装到实验装置中时，它可能会受到杂散磁场的影响，信号增益可能会恶化。为了解决这个问题，我们研究了一种想法，使用光纤将闪烁光传输到设置的外部。我们的结论是，使用透明和WLS光纤的组合，可以将光传输超过10米。此外，我们还研究了MCD-PMT对磁场的耐受性，发现如果我们安排PMT的方向，PMT可以在100 G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.