Status of the Timing Detector Plastic+SiPM Readout Option

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1 SHiP Timing Detector Status of the Timing Detector Plastic+SiPM Readout Option Ruth Bruendler, University of Zurich on behalf of the Timing Detector Group 11th SHIP Collaboration Meeting CERN 7-9 June

2 SHiP Timing Detector Timing Detector - Plastic Option Uni Barcelona: Uni Geneva: Uni Zurich: D.Ciaglia, G. Fernandez, D. Gascon, S. Gomez, R. Graciani, J.Mauricio, D. Sanchez, A. Sanuy A. Blondel, A. Dubreuil, Y. Favre, A. Korzenev, P. Mermod, E. Noah C. Betancourt, I. Bezshyiko, R. Bruendler, A. Dätwyler, N. Serra, B. Storaci 2

3 SHiP Timing Detector Outline Test beam in May Setup Results Test beam in June Setup Planned measurements Design for Module-0 Prototype array of 3x3 bars Electronics Options for the readout: analog + digitiser or ASIC Cost estimates 3

4 Test beam in May - Setup teststand T9 Baby MIND SHiP Timing Detector Teststand Beam Line 4

5 Test beam in May - Setup teststand Setup Teststand: Scintillator EJ-204, 50x6x1 cm3, no lightguide Trigger with 4 PMTs, time resolution ~40 ps SiPM readout by ASIC DAQ: Notebook with readout software for WaveCatcher CAEN WaveCatcher 16 channel: 2 channel sums from MUSIC 4 trigger 4-8 SiPMs Hamamatsu SiPMs: 6x6: S CS, S PE 3x3: S CS SiPM setups (parallel connection): single 6x6 mm2 and 3x3 mm2 array with two 6x6 mm2 or two 3x3 mm2 array with eight 6x6 mm2 HV PMTs Scintillating Bar Low Voltage MUSIC Board High Voltage SiPMs Trigger-PMTs DAQ Computer Wavecatcher 16 Channel MUSIC boards 5

6 Test beam in May - Results Results - Conclusions Two assumptions are confirmed: Time resolution (TR) of 6x6 mm2 is considerably better than of 3x3 mm2 Hamamatsu SiPMs no further tests with smaller SiPMs TR can be improved by increasing the SiPM-area using the sum function of MUSIC Comparison of HPK S CS 6x6 mm2 and HPK S CS 3x3 mm2, voltage vs TR Comparison between covered area for one or two HPK S CS (6x6 mm2), voltage vs TR 6

7 Test beam in May - Results Ambiguous results Dependence of distance between beam and SiPM array: 2-SiPM-array: TR improves with smaller distance (the beam was shifted to the left, the right end of the bar was not polished) 8-SiPM-array: TR constant, this unexpected result might occur due to a problem with the trigger PMTs Beam distance to SiPM array (2 HPK S CS) versus TR ( ps) at 57 V Beam distance to SiPM array (8 HPK S PE) versus TR, constant < 100 ps. 7

8 Test beam in June Setup Testbeam Scintillator bars EJ-204: one 50x6x1 cm3 without lightguide and two 150x6x1 cm3 with and without lightguide SiPM arrays: 8 HPK S PE (6x6 mm2) all in parallel and with four groups of two in parallel Scintillator bar EJ x11x2.5 cm3 without lightguide SiPM arrays: 4 HPK S CS and 8 HPK S PE all in parallel Main goals for measurements: Resolution as a function of # SiPMs Comparison series vs. parallel connection Resolution as a function of bar position Comparison bar dimensions, short bar vs long bar wavelength peaks HPK S13360: EJ-204: EJ-200: 450 nm 408 nm 425 nm 8

9 Module-0 Array with 8 HPK S PE 6x6 mm2 Endcap with connection to backside MUSIC board Bar size 101 x 6 x 1 cm3 SiPM connection: Endcap with connection to backside MUSIC board all in parallel or four groups (with two SiPMs in parallel) in series Scintillator bar EJ-204 or EJ-200 either with or without trapezoidal lightguides MUSIC board SiPM array Scintillator 9 Endcap connected to scintillating bar and to backside MUSIC board

10 Prototype array Prototype array by end of 2018 read-out electronics around edges array of 3 x 3 bars bar dimension 101 x 6 x 1 cm3 vertical and horizontal overlap no holes 10

11 Electronics Options for the readout analog + digitiser or ASIC Sensor + FE ~5m DAQ crate SiPM + MUSIC analog: the way we use it now SiPM + MUSIC digital: to be designed 11

12 Timing Detector - Cost Estimate For the detector dimensions 5 m x 10 m with a bar of 101 cm x 6 cm x 1 cm 10 m 5 col x 182 row = 910 bars 910 bars x 2 = 1820 channel (ch) 1820 ch x 8 SiPMs = SiPMs Plastic EJ-200, offer by Scionix 910 bars: 150 EUR/bar Total: 910 x 150 EUR = 148 kchf SiPMs based on 6x6 mm2 S NE 1600 pcs: 24 CHF/SiPM Total: 1600 x 24 = 384 kchf 10% cheaper if one buys an array of 8 Electronics FE: 80 EUR/MUSIC: Total: 80 x 1820 ch = 157 kchf + DAQ part / SAMPIC Calibration system (light pulser + fibers) to be estimated Power supplies not included 5m 12

13 Summary The current test setups include single SiPMs and SiPM arrays from Hamamatsu, 6 x 6 mm2 and 3 x 3 mm2 The results from the May testbeam show: - 6 x 6 mm2 SiPMs reach much better time resolution than 3 x 3 mm2 SiPMs - The time resolution can be improved by raising the number of SiPMs - A time resolution below 100 ps could be achieved even under suboptimal circumstances During the June testbeam three different scintillator configurations will be tested and more refined measurements concerning number of SiPMs and impact position are planned A prototype with a 3 x 3 scintillator array is planned for end of 2018 Further options for readout are considered A rough estimate of the main contributions to the overall cost without calibration system and power supplies amounts to approximately 700,000 CHF from which the SiPMs make up 55 % 13

14 Backup 14

15 Prototype array At present used: MUSIC Option: design our own board 15

16 Test beam in May - Results Problems during May test beam: Trigger malfunctioning: one of the trigger counters was not a scintillator better than 45 ps (measured with CF 8 %) should be achievable Voltages for the 8-SiPM-array not calibrated Due to new start of accelerator: low event rate during the first days widely varying event numbers between measurements changing particle types (μ, p) changing beam energy

17 Current designs for SiPM array Current bar size Uni GE: 50 x 6 x 1 cm3 Current bar size Uni ZH: 120 x 11 x 2.5 cm3 Endcaps with 8-SiPM-array under construction Endcap with connection to frontside MUSIC board 17