Why we are doing computer simulation?
The center for underground physics aims to reach the most sensitive parameter spaces for searches on a dark matter and neutrinoless double beta decays, which are extremely rare event experiments requiring ultra-low background rates. In order to meet the experimental requirements, we must understand background sources from detector components, surrounding materials of the detector, and cosmic muons.
To save time and to optimize design of each experiment for increasing signal as well as reducing backgrounds, we are performing simulations of various backgrounds in the experiments, which would provide us improving a sensitivity of our experiments.
What do we simulate?
Geant4 (GEometry ANd Tracking) is one of useful tools for simulations of our experiments. Current we are doing the KIMS-NaI detector for a search on dark matter and AMoRE detector for a search on neutrinoless double beta decays simulations to design the experiments using Linux computer cluster (see Fig. 1 and 2). These simulations give us cost and time savings for the experiment, more importantly improving sensitivity of each experiment.