| SURFACE DETECTOR | |
| THE WATER CERENKOV DETECTORS | |
| The basic detector unit of the Auger Observatory ground
array is a water tank of 12,000 liter capacity, used as a Cerenkov detector.
The detector is basically a volume of clear water acting as a Cerenkov radiator, viewed by three 20 cm photomultipliers. These tanks have to endure the agressive weather conditions of a desert, with high salt content on the ground, strong winds, hail, extreme temperatures and long exposure to sun light. The tanks are designed to survive 20 years under those conditions. | |
| POLIETHYLENE RESIN | |
| LINER | |
| WATER | |