Charge collection uniformity and irradiation effects of synthetic diamond detectors studied with a proton micro-beam

By using the micro-beam, the map of the charge collection efficiency for both the detectors have been measured. We show that the charge collection efficiency of the diamond with large contacts is generally uniform, while the diamond with smaller contacts needs further developments in this respect.

The proton micro-beam of the CNA accelerator in Seville has been used to test two detectors based on single crystal diamond grown by chemical vapor deposition. The first diamond has a more traditional design, with dimensions 4.5 x 4.5 x 0.5 mm(3), and features a large contact of the same size as the crystal. The second, with dimensions 2.0 x 2.0 x 0.3 mm3, features a small contact of 0.5 x 0.5 mm(2).