Feasibility studies on ALFA detector upgrade
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Feasibility studies on ALFA detector upgrade
Using SiPM to readout Scintillating Fibers
What has been done for ALFA The “Scintillating Fibers & SiPM” status of the art ALFA SiPM
• Collecting Information• Starting discussion• Drafting a plan
P. Beltrame
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Scintillating Fibers and G-APD for ALFA
Cosmic test of a scintillating tile with G-APD readout A 3×3 mm2 G-APD coupled to a scintillating tile (white painted) with a light guide 2 Scintillating tiles coupled to single channel PMTs as trigger counters Data acquisition by means of LabView code with temperature measurement
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Light yield – 3×3 APD coupled to scintillat-ing tile under cosmic
#PE
Fre
quency
From S. Franz
Knowle
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The Scintillating Fibers & SiPM
status of the artHigh resolution Scintillating Fiber Tracker with SiPM
readout (RWTH Aachen University)
P. Beltrame
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Tracker Module
Scintillating FibersKuraray SCSF-78MJ, Ø = 250 mm, emission at l = 440 nm, thickness varies by 6 mm
P. Beltrame
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32 channel SiPM Array
P. Beltrame
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The modular Scintillating Fiber Tracker
Hamamatsu MPPC 5883 Array of 32 channels 0.25 mm pitch 4x20 pixels/channel Vbias ~ 70 V for the whole array Pixel cross talk ~ 30%
8 mm
1.1 mm
Test beam performed at CERN (autumn 2009)
5 modulus: different fiber types: Kuraray SCSF-78MJ, Kuraray SCSF-81M readout ASICSs: VA32/75, SPIROC1
Light yield: 18 primary photons + 7 cross talk
Spatial resolution: 50 mm
ALFA SiPM
• To build a “small” SciFib – SiPM detector• To characterize and performance test
light yield, efficiency, time resolution, spatial resolution test with source and test beam
• Ready for the test beam in September
Material, budget, man power, tasks…
P. Beltrame
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6 − 10 × 2 Scintillating Fiber plate Same ALFA structure
Same ALFA Fibers: Kuraray SCSF-78:square cross section of 500 mm, cladding of 10 mm, coating of
10 nm,scintillating volume of 480 mm
emission peak of ~ 450 nm
Small SciFib – SiPM detector: Fibers
6 − 10 fibers
Singularly Readout by MPPC (Multi Photon Pixel Counter)
one single MPPCor array of 4 MPPCs
SiPM
SiPM
P. Beltrame
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Fibers singularly read out by MPPC
Silicon Photo Multiplier
S10362-11-025P(050P) Active area: 1x1 mm2, pixels: 25x25 (50x50) mm2
Peak wavelength: 440 nm Gain: 2.75x105 (7.5x105), Dark count: 300 kcps (400 kcps) Price: ~ 125 chf
Array (1x4 channel) S10984-025P(050P) Active area: 1x4 mm2, pixels: 25x25 (50x50) mm2
Peak wavelength: 440 nm Gain: 2.75x105 (7.5x105), Dark count: 300 kcps (400 kcps) Price: ~ 560 chf
Small SciFib – SiPM detector: Photo Detectors
P. Beltrame
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Front End Electronics Exploiting the ALFA’s one Providing adaptable HV for the SiPM Routing the signal to the chip MAROC (Multi Anode ReadOut Chip) is a 64 ch ASIC which has a variable gain preamplifier and produces 64 trigger outputs and a multiplexed charge measurement
DAQ Exploiting the ALFA’s one LabView code with Temperature monitoring Data writing and storing
Small SciFib – SiPM detector: Electronics and DAQ
P. Beltrame
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Some thoughts about the work to do
To be ready for the ALFA test beam in August/September
Detector construction Getting the Scintillating Fibers (should be easy)
12 − 20 for the detector spares?
Getting the Silicon Photo Multipliers (perhaps the longest issue) 12 − 20 (1x1 mm2) or 4 (1x4 mm2 array) for the detector spares?
To be ready with the electronics (exploiting what already exists… make it easier?) Mechanical support
Possibility to use the ALFA’s one?
Starting test with a source or with cosmic rays
Thank you