download report - Sapienza
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Scientific Report 2007-2009<br />
Laboratories and Facilities of the Department of Physics<br />
L16. Electronics and Silicon detectors Lab<br />
The Laboratory of electronics and silicon detectors is primarily<br />
involved in the experiments of ultrarelativistic heavy ion and nuclear<br />
physics with particle beams: ALICE experiment at CERN<br />
and JLAB12 experiment at Jefferson Laboratory in the USA. The<br />
Laboratory is also involved in the R&D activities for PET use<br />
in medical applications with Silicon Photon Multiplier (SiPM)<br />
detectors: AX-PET Collaboration at CERN and TOPEM Collaboration<br />
in a R&D of INFN. In addition the Laboratory is<br />
developing a Fast Photometer System based on silicon detector<br />
SiPM for variable star measurements: collaboration with SCAE<br />
group of our Department.<br />
The instrumentation allows the Laboratory to develop electronics<br />
on FPGA and allows testing FPGA and ASIC dedicated<br />
to the reading of silicon detectors using a logic analyzer and Pattern<br />
Generator both interfaced with a PC. A manual type Probe<br />
Station allows the test on wafers with diameter up to 8” (see Figure<br />
1). It is available a data acquisition system via VME to PC<br />
Figure 1: 8” wafer in 0.25 micron CMOS thecnology<br />
used for SDD ASIC in ALICE experiment.<br />
using dedicated software (Labview). A climatic chamber allows tests on individual silicon detectors in the range between<br />
10 ◦ C and 70 ◦ C with a current I = I(V ) measurement through Pico Ammeter. Finally, an optical pulsed system based on<br />
LED allows their characterization in terms of response to short pulses (down to 0.9 ns).<br />
http:www.roma1.infn.it/exp/alice<br />
Related research activities: P8.<br />
L17. SCILab<br />
In the SCI-Laboratory have been developed, in<br />
Collaboration with other Institutions and University<br />
since 10 years several prototypes of particle<br />
Detectors by collection of light emitted by scintillating<br />
plates. To optimize the light collection efficiency<br />
the Wave Length Shift fibers located on a<br />
side of a plate or in a groove of a tile were extensively<br />
studied. The Test results of these prototypes<br />
were used to build the muon time stamp Detector<br />
(CMP) and the Preshower Detector designed<br />
to separate the electron/pion. Both Detectors were<br />
installed into the 2 TeV Central Detector at Fermilab,<br />
CDF, USA. Application of commercial photomultiplier<br />
tubes with single anode or multi-anode<br />
were investigate by different light readout to maximize<br />
the amplification of the signal. Recently in<br />
the Laboratory we have started Tests of the Silicon<br />
Photomultipliers (SiPM),Fig. 1, for a new generation<br />
of Calorimetry Detectors (FACTOR Experiment,<br />
INFN ), Muon Detector (T995 Experiment<br />
at FNAL) and track reconstruction of large zenith<br />
mV<br />
15<br />
10<br />
5<br />
0<br />
-5<br />
-10<br />
-15<br />
-20<br />
-25<br />
-30<br />
-35<br />
-40<br />
Event 72<br />
01-13-2010 04:18:57. 226736<br />
290 300 310 320 330 340 350<br />
Figure 2: PMT signals (black and blue) of a muon track detected<br />
by the telescope and digitized by the DRS4 with 2GS/s. The 1x1<br />
mm 2 SiPM signal (green) detected by a tile insert in the telescope is<br />
shown. The time difference between SiPM and PMT’s is due to length<br />
difference of the cables. The telescope tiles are 10 cm apart along the<br />
vertical axis.<br />
angle atmospheric showers. The Laboratory is equipped with a DAQ chain that uses fast VME electronics: Time Digital<br />
Converter with time resolution of few ps, Analog Digital Convertor to integrate the PMT signal, NIM Logic Units and a<br />
GHz Pulse generator used for the characterization of the scintillators. To test the performances of the prototypes we use a<br />
radioactive source ( 60 Co) or a muon telescope able to select cosmic rays. The telescope covers a solid angle of 1/64 stereo<br />
radians and is equipped with a low threshold discriminator (5 mV) that provides a TTL/NIM trigger sent to a 6 GS/s<br />
waveform Digitizing Board (DRS4) with 12 bit resolution, readout speed 30 MHz, jitter less than 100ps. The digitization is<br />
transmitted by USB2 cable to a PC and analyzed by Linux software, Fig 1.<br />
Related research activities: P9, P10, P11.<br />
ns<br />
PM1<br />
PM2<br />
SiPM<br />
<strong>Sapienza</strong> Università di Roma 188 Dipartimento di Fisica