Large area cylindrical silicon drift detector

Summary form only given. An advanced kind of silicon detector, a large-area cylindrical drift detector, was designed, produced, tested, and installed in an experiment. The active area of the detector is practically the total area of a 3-in-diameter wafer. Signal electrons created in the silicon detector by fast charged particles drift radially outside toward an array of 360 anodes located at the outermost radius of the detector. The drift time measures the radial coordinate of the fast particle; the charge sharing between anodes measures the azimuthal coordinate. The detector provides unambiguous pairs of r, phi coordinates for very high multiplicity events up to several hundred. The precision of the position measurement in each coordinate is about 10 mu m, giving about 10/sup 7/ 2-D elements. There is a small hole in the center of the detector to allow the passage of the noninteracting particle beam. The longest drift distance is about 3 cm. The nominal value of the drift field is 500 V/cm, resulting in a maximum drift time of 4 mu s.<>