GEANT4 simulation of the water detector Cherenkov at the Large Aperture Gamma Ray Burst Observatory, in Sierra Negra, Mexico

摘要

Large Aperture Gamma Ray Burst Observatory located at 4,600 meters is developed to detect gamma ray bursts, using water Cherenkov detectors and the single particle technique. In the first stage of work three four square- squaremeter detectors and two one square-meter detectors were installed. These detectors monitor the count rate of secon meter secon- dary particles, as well as temperature and pressure measurements to correlate these parameters with the count rate. With the installation of new tanks, new simulations are needed to optimize light collection. These tanks have a cylindrical geometry with a diameter of seven meters and height of one meter. Inside each tank, a triangular arrangement of three photomultiplier tubes is installed, with the tubes positioned at the vertices of the polygon. A study was performed of the signals generated in the photomultiplier tubes at different distances from the center to be able to detect the largest number of photons. The simulation code was written with the GEANT4 package taking into account the physical processes that exist in the water Cherenkov detector.