The response of graphite-diamond pixel detectors to 90Sr b-particles is reported. Laser induced graphitization was used to realize 200 mm 200 mm square conductive graphite pads on one detector side whereas a large area graphite contact was realized on the other face for biasing. A board with nine hybrid charge sensitive pre-amplifier channels was used to test homogeneity of response of nine pixels at a time. In the dark the current is Ohmic up to 100V where the current increases with a power law. While the bulk pixel resistance is 2:51012W, the resistance between adjacent pixels depends on voltage following a power law. Under irradiation a resolved b-spectrum well separated from the noise contribution was observed on each pixel. The most probable value of the collected charge distribution is voltage dependent and saturates around 300V (0.6 V/mm) with a value of 0.700.05 fC (4300300 equivalent electrons charge).
M., P., P., A., Conte, G., E., S., V. G., R., M. S., K., et al. (2013). Diamond-graphite pixel array for particles detection. JOURNAL OF INSTRUMENTATION, 8(C10013), 1-6 [10.1088/1748-0221/8/10/C10013].
Diamond-graphite pixel array for particles detection
CONTE, Gennaro;
2013-01-01
Abstract
The response of graphite-diamond pixel detectors to 90Sr b-particles is reported. Laser induced graphitization was used to realize 200 mm 200 mm square conductive graphite pads on one detector side whereas a large area graphite contact was realized on the other face for biasing. A board with nine hybrid charge sensitive pre-amplifier channels was used to test homogeneity of response of nine pixels at a time. In the dark the current is Ohmic up to 100V where the current increases with a power law. While the bulk pixel resistance is 2:51012W, the resistance between adjacent pixels depends on voltage following a power law. Under irradiation a resolved b-spectrum well separated from the noise contribution was observed on each pixel. The most probable value of the collected charge distribution is voltage dependent and saturates around 300V (0.6 V/mm) with a value of 0.700.05 fC (4300300 equivalent electrons charge).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.