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

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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.