Calibration and first measurements of MuTe: a hybrid Muon Telescope for geological structures

Abstract

In this work, we describe the calibration and first measurements in the commissioning of MuTe, a hybrid Muon Telescope with two subdetectors -a scintillator hodoscope and a Water Cherenkov Detector (WCD)- for imaging the inner structures of Colombian volcanoes. The hodoscope estimates the trajectories of particles impinging on the front and rear panel, while the WCD acts as a calorimeter for the through going charged particle. MuTe combines particle identification techniques so as to discriminate noise background from data. It filters the primary noise sources for muography, i.e., the EM-component (e±) of Extensive Air Showers (EAS) and scattered/upward-coming muons. The WCD identifies Electrons/positrons events by their deposited energy identifies, while scattered and backward muons are rejected using a pico-second Time-of-Flight(ToF) system. Muon generated events were found in the deposited energy deposited range of (144MeV 3.3 ns for traversing one meter length.