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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:34 |
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Conference: Bucharest University Faculty of Physics 2013 Meeting
Section: Atomic and Molecular Physics; Astrophysics
Title:
Integration of the SiPM(MPPC) Devices in a Subassembly of a
Detector for the investigation of the Cosmic Muons
Authors:
Mihai Niculescu-Oglinzanu
Affiliation:
Horia Hulubei National Institute of Physics and Nuclear Engineering - IFIN HH ;
Bucharest University Faculty of Physics
E-mail
mihai_niculescu_oglinzanu@yahoo.com
Keywords:
MPPC Detector Cosmic Muons
Abstract:
We study the feasibily of a MPPC muon detector for the measurement of the cosmic muons, by use of SiPM photodiodes and fast acquisition electronics, in particular,scrutinizing the possibility to determine the position of the incident muons by amplitude discrimination. A subassembly of the detector has been built with two modules, each test module being composed of a plate-shaped scintillator material with 25 x 100 x 1 cm3 size, including 12 longitudinal stripes, each filled with an optical fiber of 1.5 mm diameter, read by a device pairs of SiPM, ( Hamamatsu model MPPC S10362-33-100C). The tests for the attenuation have shown that the attenuation along the fiber from 10 cm to 100 cm changes from 25% to 35%. We found big fluctuations for the neighboring channel, features showing that a reconstruction of the muon trajectory based on amplitude signals may be imprecise. After the analysis of 55516 events recorded in 6 days with different temperatures, 16889 events have been identified as muons (efficiency 30.4%).The measurements performed with the assembly of two modules have shown that it is possible to determine the position of the muon incidence in the two plates by the analysis of the signal amplitudes on different optical fibers, which could define the muon incidence in a plane x-y. But the procedure suffers from lack of efficiency, as only about 30.4% from the measured events can be used fo the reconstruction of the muon trajectories. Based on this experience we decided to built a MPPC muon detector by using another configuration, by sectioning the sensitive volume 25 x 100 x 1 cm3 in 4 x 100 x 1 cm3 stripes and to replace the analog acquisition technique by the digital one.
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