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 × 4.5 × 0.5 mm3, and features a large contact of the same size as the crystal. The second, with dimensions 2.0 × 2.0 × 0.3 mm3, features a small contact of 0.5 × 0.5 mm2. 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. A proof of principle test with a fast electronic chain has been performed to demonstrate that spatially resolved pulse shape analysis can be performed with this system. The micro-beam allowed also studying radiation-induced permanent damage and polarization, which are two irradiation effects of importance for the development of diamonds used in spectroscopy applications.
Cazzaniga, C., Rebai, M., Garcia Lopez, J., Jimenez Ramos, M., Girolami, M., Trucchi, D., et al. (2017). Charge collection uniformity and irradiation effects of synthetic diamond detectors studied with a proton micro-beam. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION B, BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 405, 1-10 [10.1016/j.nimb.2017.05.015].
Charge collection uniformity and irradiation effects of synthetic diamond detectors studied with a proton micro-beam
REBAI, MARICASecondo
;NOCENTE, MASSIMO;TARDOCCHI, MARCOPenultimo
;GORINI, GIUSEPPEUltimo
2017
Abstract
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 × 4.5 × 0.5 mm3, and features a large contact of the same size as the crystal. The second, with dimensions 2.0 × 2.0 × 0.3 mm3, features a small contact of 0.5 × 0.5 mm2. 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. A proof of principle test with a fast electronic chain has been performed to demonstrate that spatially resolved pulse shape analysis can be performed with this system. The micro-beam allowed also studying radiation-induced permanent damage and polarization, which are two irradiation effects of importance for the development of diamonds used in spectroscopy applications.
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