The Array of Atmospheric Cherenkov Telescopes at Milagro to Study Cosmic Ray Composition

An array of Wide Angle Cherenkov Telescopes (WACT) has been built around the Milagro observatory. With its six telescopes WACT measures the lateral distribution of Cherenkov light which has been shown to be sensitive to the depth of maximum shower development(9). The primary physics goal of WACT is to measure cosmic ray composition in the region where it has been directly observed up to energies of several hundred TeV. In this conference we will present the first results from WACT based on data collected over the winter of 2002/2003.