Readout scheme for the Baby-MIND detector

E. Noah1, A. Blondel1, Y. Favre1, Y. Kudenko2, O. Mineev2, R. Tsenov2

1University of Geneva, Switzerland2INR, Russia

PD15: Moscow: Troitsk: 6-9 July 2015

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Outline

• The Baby-MIND detector• Detector module characteristics• Choice of photosensors• Module light yield with CITIROC• Baby MIND Front End Board

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• Muon spectrometer consisting of magnetized plates of iron interleaved with plastic scintillator detector modules.

• Modularity in magnetization design simplifies proposed use at various facililities, downstream of:– WAGASCI at J-PARC (2016 onwards) : anti-nu selection

efficiencies > 90%.– LAr (WA105) (2017 onwards): Use of MIND detectors

integrated from start of studies or Long Baseline experiments in Europe (LBNO): muon charge ID and momentum, tail catching of hadronic showers. Baby MIND could provide partial acceptance for events in 6×6×6m3 of WA105 LAr.

The Baby-MIND detector

WAGASCI @ J-PARC

WA105 @ EHN1 extension

Baby-MIND positioned here

Side MRDs

Wagasci

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Optical readout of plastic scintillator planes

PMT-based: MICE-EMR installed at RAL Sep. 2013

SiPM-based: AIDA Baby MIND

PMT

SiPM

Implemented for several thousand channels first at T2K ND280

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Detector modules

Plastic scintillator bars:• Extruded scintillator slabs produced at Uniplast

company, Vladimir, RU:• polysterene-based, 1.5% paraterphenyl (PTP) and 0.01%

POPOP.• Slabs etched with chemical agent (Uniplast) to create a

30-100 mm layer that acts as a diffusive layer

• Custom optical connectors (INR design for AIDA)• Kuraray Y11 WLS fiber in 2mm deep groove• Dimensions: 900 x 10 x 7 mm3

Module characteristics :• 2 planes, X/Y

• Each plane: 84 plastic scintillator bars

• 1st prototype Nov. 2014

Poster: The design, construction and testing of TASD: A. Mefodiev et al.

Photosensor connector: INR design

Optical cement light transmission WLS fiber: St. Gobain & Kuraray Y11 Light yield measured for > 9000 bars

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Dark cnts [kHz]thres.: 0.5 p.e.

Photosensors

Options tested:• MPPC/ASD40/KETEK/SensL• Several MPPC variants

Selection:• Hamamatsu MPPC S12571-025C• 1 × 1 mm2 • 25 mm cell size• 3000 delivered by 6 Mar. 2015

Vop [V]25oC

WLS fiber and MPPC alignment

MPPC test data by Hamamatsu

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Calibration & digitization

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3

4

SiPM

① Scintillation ② Light trapping efficiency in WLS fiber③ Light attenuation in WLS fiber④ Optical connector insertion loss⑤ SiPM response⑥ Electronics response

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Lab.

Beamline

Individual bar characterization: n bars

Module QA: n/m bars

Cosmic m, radiosource

Cosmic ?m m,p,e,p

Charged particle

8

ch0

ch7

ch8

ch15

ch16

ch23

ch24ch27

ch28ch31

Bar light yield test: post module assembly

Setup in dark room

Channel configuration: channels under test ch0-15

25oC

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ADC[12-bit]

FPGA

Delay

MPPCx32

PlasticScint. barsx32

LabVIEW

usb

Module characterisation with CITIROC evaluation board

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12.5 ns 25 ns 37.5 ns 50 nsCITIROC shaper time constant

62.5 ns 75 ns 87.5 ns10

ns

20 n

s30

ns

40 n

s50

ns

60 n

sO

R32/

Hol

d de

lay

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Feedback capa.= 1 [arb.]48.2 ADC/p.e.

Feedback capa. = 6 [arb.] 25.6 ADC/p.e.

Feedback capa. = 4 [arb.] 32.2 ADC/p.e.

Feedback capa. = 8 [arb.]19.3 ADC/p.e.

• Regime:– high enough gain to

resolve indivual p.e. peaks whilst avoiding saturation

• Dynamic range (HG):– 12-bit ADC– Baseline ~950– 19.3 ADC/p.e.– 160 p.e.

• > 1600 p.e. with LG.

Varying Pre-amp Feedback capacitance

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Light yield: sum of both ends of bar

Bar pos.[#]

Bar ID[#]

Bar INR[p.e.]

Module[p.e.]

1 6421 124.4 145.2

2 6411 125.4 155.4

3 6422 119.0 138.7

4 6410 134.6 153.6

5 6414 112.9 142.5

6 6409 118.6 136.6

7 6412 129.4 146.2

8 6413 119.0 183

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ch0

ch7

ch8

ch15

ch16

ch23

ch24ch27

ch28ch31

“Optical” crosstalk: light yield in adjacent bars

ab

cd

L.y. cuts:Ch3>70p.e.Ch11>70p.e.Ch19>70p.e.

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a

b

c

d

“Optical” crosstalk: l.y. sum of both ends collected in adjacent bars

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Baby MIND electronics chain

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Baby MIND FEB

FEB characteristics :• 96 SiPM channels (mini coax. connectors), 84 used for Baby MIND• 3 CITIROC ASICs (32 ch charge ampl., trigs, ext. common HV + independent 0/4V)• 12-bits 8-ch ADC 40Ms/s/ch• 2 x 6Gb/s transceiver (800Mb/s for Baby MIND)• USB3.0 (5Gb/s) µC for lab, calib. & maintenance• LV & HV power supplies• Altera ARIA 5 FPGA (mid-range), firmware :

• 84 ch. Timing meas (2/2.5ns resolution)• Charge meas. (from 12-bits ADC)• Baseline computation (filtering)• USB3.0 gateway• Gigabit protocol for readout (exp.)

• PCB: • 8 layers • 120µm space/width lines• Impedance & length control (TDC)

• Schedule:• First prototype FEB 11 March 2015• Firmware development ongoing• ~ 30 Baby MIND FEBs Dec. 2015

Baby MIND FEB (Photo by Y. Favre 12 March 2015)

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FEB firmware architecture

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• Baby MIND spectrometer modules:– all 9400 bars measured for light yield at INR before assembly into

modules at UniGe– choice of photosensor made, 3000 MPPC S12571-025C delivered by

March 2015 with good QA data– Test procedure for module characterization

• Electronics:

– CITIROC tested with evaluation board from Omega Microelectronics (8-bit DAC for Vop, Pre-amp gain, shaper, discriminator, Or32 Mask)

– FEB produced (3 CITIROC/FEB)– Firmware architecture done (documented)– Firmware implementation ongoing

Summary

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thanks toF. Cadoux, M. Dementjoz, S. Fedotov, A. Khotyantsev, A. Kleimenova, A. Mefodiev, L. Nicola, T. Ovsiannikova, N. Yershov...

... to you for your attention

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Back-up

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Tested SiPM parameters at INR

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Tested SiPM performance at INR

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Tests of 1 x 1 mm2 MPPC at INR

“New” MPPC 50mm cell size same optical cross-talk and afterpulsing for both, sensitive area difference:• 1x1 mm2 = 16.4 p.e.• 1.3x1.3 mm2 = 17.2 p.e.

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Hamamatsu options tested

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Hamamatsu options vs readout

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Hamamatsu MPPC S12571-025C spec.

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Hamamatsu MPPC S12571-025C: gain and PDE