DArk MAtter - DAMA

The DAMA search which stands for Dark Matter uses a completely different approach than the CDMS experiment. Instead of waiting for detections within an apparatus, they hope to find proof of WIMPs through the “WIMP wind”. The experiment is conducted 1400 meters under ground in the Gran Sasso Underground Labratory near Rome. The WIMP wind comes from the fact that all of the WIMPs are moving around in the halo of the galaxy. As the solar system moves through the galaxy (at a speed of about \(230 km/s\)) we crash into the WIMP wind. Also, as the Earth moves around the Sun, there are certain times when the speed of the Earth around the Sun adds with the speed of the Sun around the galaxy and there are times when the speed of the Earth is moving against the speed of the Sun around the galaxy. The best time to detect the WIMPs in the WIMP wind would be when we are moving at the fastest in comparison to the WIMP wind. Figure 8 shows just how this works. In June, our velocity from rotating around the Sun adds with the velocity of the solar system going around the galaxy and in December, the speed of the Earth goes against the velocity of our rotation around the galaxy and will decrease the relative speed. (4, 6)