Properties of a New Cosmic-ray Detector (SciCRT) Installed at Mt. Sierra Negra, Mexico

TheSciCRT(SciBar for the Cosmic Ray Telescope) is a new project for a new multi-purpose cosmic- ray experiment. The main scientific aim of the SciCRT is to measure solar neutrons and to monitor cosmic-ray muons with high angular resolutions. It is installed at Mt. Sierra Negra in Mexico, 4,600 m above sea level. The detector was calibrated using cosmic-ray signals at INAOE (Instituto Nacional de Astrofisica, Optica y Electronica) in Puebla, Mexico at 2200 m a.s.l. The detector consists of 14,848 polystyrene scintillator bars (2.5 cm × 1.3 cm × 3 m) with TO2 coating. Wavelength shifting fibers inserted in the scintillator bars are connected to multi-anode photomultiplier tubes (MAPMTs). The deposited energy in each bar is recorded. The trigger of data taking is produced by the collection of hit signals from all the MAPMTs through the VME module with a FPGA chip. In this paper, the detector configuration, the data acquisition system, and the trigger logics to measure both neutrons and muons will be presented. Some of the most recent cosmic ray data from the experiment will also be shown.