DES is using a large suite of computer simulations
A simulated image on a portion of one the DECam CCD chips. The simulation is being used to tune and calibrate the supernova finding analysis system.
to aid in the cosmological analyses. This DES program begins with a large simulation
of the formation of structure in the universe, follows the formation of galaxies, and then views this simulated universe of galaxies
and stars through the eyes of DECam, using the known characteristics of the camera and the telescope to create images that look very much
like the real data we will acquire. These simulated images are run through the same automated data analysis software pipeline that will be
used to analyze the real data. By comparing the known information that produced the simulated data to the output of the analysis programs,
DES scientists can calculate the effectiveness of the analysis software and search for any biases it may have introduced.