Characterization of irradiated P-type silicon detectors by the ALIBAVA system

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 617; no. 1; pp. 565 - 567
• Main Authors: Miñano, M., García, C., Lacasta, C., Marco-Hernández, R., Martí-García, S., Soldevila, U.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 11-05-2010
• Subjects: ALIBAVA system; Chips; Detectors; Irradiation; Luminosity; Mathematical analysis; p-type; Radiation detector; Semiconductors; Sensors; Silicon; sLHC; Strip; ALIBAVA system; p-type; sLHC; Radiation detector; Silicon
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/j.nima.2009.09.040

The ATLAS Tracker System has been designed to withstand the radiation doses accumulated with 10 years of running at a LHC luminosity of
10
34
cm
-
2
s
-
1
. The operation under an upgraded luminosity of
10
35
cm
-
2
s
-
1
(superluminous LHC) implies to upgrade the semiconductor tracking systems of the LHC experiments. The expected dose for the inner detector trackers at the superluminous LHC experiments is up to
10
16
1
MeV
equivalent neutron
cm
-
2
after the envisaged five years of operation. Investigations have showed arguments in favour of implementing the n-type strip readout on a p-type substrate (currently the Semiconductor Tracker, SCT, uses p-type strip readout on a n-type substrate). In order to evaluate the radiation damage p-type microstrip sensors have been irradiated with neutrons and protons at several fluxes up to
10
16
cm
-
2
. Electrical and charge collection efficiency measurements have been carried out by means of a radioactive source setup as well as by an infrared laser illumination and the measurements compared with a non-irradiated sensor as a reference. The ALIBAVA acquisition system has been used. It is a compact and portable system which contains two front-end readout chips (Beetle chip) to acquire the detector signals. One of the advantages of the ALIBAVA system is that it uses LHC speed electronics. Another one is that it performs a pulse by pulse and strip by strip analysis.