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

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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

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The Scintillating Fibers & SiPM

status of the artHigh resolution Scintillating Fiber Tracker with SiPM

readout (RWTH Aachen University)

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Tracker Module

Scintillating FibersKuraray SCSF-78MJ, Ø = 250 mm, emission at l = 440 nm, thickness varies by 6 mm

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32 channel SiPM Array

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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…

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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

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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

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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

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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