MIFP MIFP PUBLICATIONS

MIFP PUBLICATIONS

Folder Path: \ MIFP Publications \

File: Nano-carbon pixels array for ionizing particles monitoring

pdf.png
Uploaded:
31.08.16
Modified:
31.08.16
File Size:
629 KB
Downloads:
608

S. Salvatori, P. Oliva, M. Pacilli, P. Allegrini, G. Conte, M. Komlenok, A.A. Khomich, A. Bolshakov, V. Ralchenko, V. Konov


The paper deals on the response of a polycrystalline diamond sensor, 500 μm thick, to particles from a Sr β-source. 21×21 nano-carbon pads, with 0.18 mm×0.18 mm area each, were realized by ArF excimer laser irradiation on one diamond face, whereas a 7×7 mm2 backside contact was fabricated and used for sensor biasing during characterization of sensor under β-source irradiation. The carbon pads embrace a number of grains, which show different degrees of surface graphitization dependent on the grain orientations. Each carbon pad exhibits a linear I(V) response up to 200 V. The average number of charge carriers collected by a single pixel, as well as the distribution of pixels involved by the impinging particle tracking, is analyzed as a function of the applied voltage recording the signals acquired by 16 pixels at a time. The pulse height distribution is not affected by reversing the bias polarity. For a single pixel, the most probable collected charge value is 1.40±0.02 fC whereas the main value gives Qcoll=1.67±0.02 fC (10430 ±120 electrons). The charge collection distance was measured tacking into account the effect induced by highenergy electrons and found to be 285±3 μm, demonstrating the absence of bulk defects induced by the laser graphitization processing. Cross-talk effects between nearest-neighbor pixels has been excluded analyzing the results obtained in a batch of more than 1000 events even if the same cannot be excluded under higher energy particles.

We use cookies to improve our website and your experience when using it. Cookies used for the essential operation of the site have already been set. To find out more about the cookies we use and how to delete them, see our privacy policy.

I accept cookies from this site.

EU Cookie Directive Module Information