Speaker
Description
The KOTO ll experiment is planned as a next-generation successor to the KOTO experiment. We have been studying a Shashlyk-type calorimeter for the KOTO ll experiment. The Shashlyk-type calorimeter consists of alternating layers of lead and plastic scintillator tiles, penetrated by wavelength-shifting (WLS) fibers. To investigate its performance, a test setup composed of 10 scintillator tiles and 36 WLS fibers (without lead plates) was constructed. The light yield and timing resolution of the test counter were evaluated with cosmic rays. With these results, the energy and the timing resolutions of the calorimeter were estimated using simulations by taking into account the attenuation of photons propagating in the WLS fibers. We will report on these results.