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

下一代直线对撞机实验热量计读出系统研究

基本信息

批准号：
11640256
负责人：
MORI Toshinori
金额：
$ 1.92万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

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.

本研究的目的是在JLC实验中评估构建量热计读出系统的最佳参数，目的是完全验证标准模型，发现标准模型之外的新粒子和新现象。为此，我们选择金属沟道动力极PMT(MCD-PMTS)作为传感器并对其进行研究。此外，我们还研究了通过光纤传输来自量热计的闪烁光的想法。我们使用蓝色LED测试了MCD-PMT。整个布景都放在一个铝制的黑色盒子里。研究发现，MCD-PMT的信号增益比APDS的信号增益大10倍。MCD-PMT被安装在液体氙量热计中，并在JLC实验中考察了它们在更真实条件下的性能。在JLC实验中，要求传感器的时间分辨率应优于1ns以进行束团识别。当我们使用MCD-PMT时，我们发现对于10GeV的基元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仪时，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，我们研究了一种使用光纤将闪烁光传输到装置外部的想法。我们的结论是，使用透明光纤和WLS光纤的组合，可以传输超过10米的光。此外，我们还研究了MCD-PMT对Magnatec场的耐受性，发现只要我们安排PMT的方向，这种PMT就可以用于100G。