Performance studies of a single HV stack MRPC prototype for CBM

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Presentation transcript:

Performance studies of a single HV stack MRPC prototype for CBM RPC 2016 – XIII Workshop on Resistive Plate Chambers and Related Detectors Performance studies of a single HV stack MRPC prototype for CBM Ingo Deppner Physikalisches Institut der Uni. Heidelberg Outline: CBM-ToF requirements TDR Tof wall design Test beam time at GSI Single stack vs. double stack Performance results Summary / Outlook Het Pand Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

CBM spectrometer Engineering design of the CBM experiment TOF TRD Nominal ToF position is between 6 m and 10 m from the target RICH Magnet Movable design allows for optimization of the detection efficiency of weakly decaying particles (Kaons) STS Interaction rate 10 MHz Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Incident particle flux URQMD simulated charged particle flux for Au + Au (minimum bias) events at 25 AGeV assuming an interaction rate of 10 MHz kHz/cm2 Flux ranging from 0.1 to 100 kHz/cm2 At different regions MRPC counters with different rate capabilities are needed Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Requirements Charged hadron identification is provided by Time-of-Flight (ToF) measurement CBM-ToF Requirements Full system time resolution sT ~ 80 ps Efficiency > 95 % Rate capability  30 kHz/cm2 Polar angular range 2.5° – 25° Occupancy < 5 % Low power electronics (~120.000 channels) Free streaming data acquisition twisted pair cabe twisted pair cabe RPC feed through gas box 120 W 80 W 1 ns Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

TDR ToF wall layout 6 types of modules (M1 – M6) only A module contains several MRPC counters Region containing counters equipped with float glass Region containing counters equipped with low resistive glass Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

TDR ToF wall layout  106368 read-out channels 6 types of modules (M1 – M6) only A module contains several MRPC counters Region containing counters equipped with float glass Region containing counters equipped with low resistive glass  106368 read-out channels Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

TDR MRPC arrangement Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

TDR MRPC arrangement 140 140 0.7 0.28 0.28 12 12 Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Modules M1 M2 M3 M4 M5 M6 a: MRPC, b: Preamplifier (PADI), c: feed-through PCB, d: connectors, e: crate, f: TDC and read out Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Module back plane with feed-through Modules PADI8 M1 M2 M3 GET4 TDC Module back plane with feed-through feed-through PCB M4 M5 M6 GET4 TDC a: MRPC, b: Preamplifier (PADI), c: feed-through PCB, d: connectors, e: crate, f: TDC and read out Ingo Deppner RPC 2016 Gent 22 - 26.02.2016 32 channels

MRPC-P2 prototype Full size demonstrator for high rates (1 - 10kHz/cm2) HV electrode (Licron) Low resistive glass 27 x 32 cm2 Spacers (fishing line) Pickup electrode Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Test beam time @ GSI Setup THU-Strip Test beam time in October 2014 at GSI (Hades cave) Sm beam with 1.2A GeV kin. energy 5 mm thick lead target „Uniform“ illumination of the counter surface Flux on the lower part of the setup was about few hundred Hz/cm2 Delivered flux does not meet the CBM requirements R143a 85%, SF6 10%, iBut 5% THU-Strip Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Test beam time @ GSI Full size demonstrator and reference MRPC used for the performance analysis MRPC-P2 (HD) THU-strip (Beijing) MRPC-P5 (HD) MRPC differential differential differential glass stack single double single active area 32 x 27 cm2 24 x 27 cm2 15 x 4 cm2 strips 32 24 16 strip / gap 7/ 3 7/ 3 7.6 / 1.8 mm glass type low resistive glass low resistive glass low resistive glass glass thickness 0.7 mm 0.7 mm 1.0 mm number of gaps 8 2 x 4 6 gap width 220 mm 250 mm 220 mm MRPC-P2 THU-strip MRPC-P5 Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

2 MRPC concepts vs. Differential singel stack MRPC with 8 gaps Differential double stack MRPC with 2 x 4 gaps vs. Advantages - simpler construction - symmetric signal path - fewer glass plates (#9) - lower weight - impedance matching easy possible (100) Disadvantages - higher High Voltage (> 10 kV) - bigger cluster size Advantages - lower High Voltage (< 6 kV) - smaller cluster size Disadvantages - more complex construction - more glass plates (#10) - impedance matching hardly possible (100) Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Counter occupation Active area of overlain counters D.u.t. MRPC-P2: 32 x 27 cm2 Reference MRPC-P5: 15 x 4 cm2 Plastic: 8 x 2 cm2 Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Efficiency vs. Differential singel stack MRPC with 8 gaps Differential double stack MRPC with 2 x 4 gaps vs. Efficiency > 98 % Efficiency > 96 % Matched hit pairs in dut - ref Matched hit pairs in dia - ref Efficiency= Data points at 11 kV in the left plot can be compared with 5.5 kV in the right plot. Single stack MRPC shows slightly better efficiency Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Cut selection on the reference counter Edge effects Cut 1 Cut selection on the reference counter Dt distribution Cut 3 Cut 1 Dt distribution Cut 3 Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Time difference vs. particle velocity Dt distribution Ingo Deppner RPC 2016 Gent 22 - 26.02.2016 HV = 11 kV, Uthr = 200 mV

Time difference vs. particle velocity Dt distribution Ingo Deppner RPC 2016 Gent 22 - 26.02.2016 HV = 11 kV, Uthr = 200 mV

Time resolution vs. Differential singel stack MRPC with 8 gaps Differential double stack MRPC with 2 x 4 gaps vs. Data points at 11 kV in the left plot can be compared with 5.5 kV in the right plot. Single stack MRPC shows slightly time resolution. Single counter resolution is in the order of 45 ps including all electronic components. Resolution  62 ps Resolution  65 ps Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Cluster size Dt distribution Time resolution does not deteriorate with cluster size bigger than one 80 W 1 ns Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Cluster multiplicity Dt distribution Counter time resolution below 50 ps up to the highest multiplicity @ an occupancy of about 50% 80 W 1 ns Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Summary/Outlook Outlook Summary TDR is approved. However no final decision regarding counter design is taken. The design of the differential single stack MRPC from Heidelberg is driven by the free- streaming readout  impedance matching is realized. The single stack MRPC shows slightly better efficiency and time resolution in comparison to a double stack MRPC. The double stack MRPC shows a smaller cluster size (about 1.6). Single counter resolution is in the order of 45 ps including all electronic contributions. However, in a free running mode an impedance matched MRPC might show a better performance due to minimized signal reflections. Outlook Load test for all available full size prototypes in Nov. 2015 with heavy ions at SPS CERN Among them 3 full size modules M4 with counters MRPC3a and MRPC3b were tested Data analysis is still ongoing Selection of the final layout and counter configurations this year based on beam time results. Start of the low resistive glass production this year Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Outlook CBM MRPC3b x  2.3 mm & y  3 mm About 1100 channels 20 MRPC Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Event display after calibration Outlook Event display after calibration 1 Track (blue) with mult. 8 2 Tracks (green) with mult. 7 Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Thank you for your attention Contributing institutions: Tsinghua Beijing, NIPNE Bucharest, GSI Darmstadt, IRI Frankfurt USTC Hefei, PI Heidelberg, ITEP Moscow, HZDR Rossendorf, CCNU Wuhan, Special thanks go to: Norbert Herrmann Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Backup Slides Backup Ingo Deppner RPC 2016 Gent 22 - 26.02.2016 80 W 1 ns Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Backup Slides p K CBM Physics topics Deconfinement / phase transition at high ρB QCD critical endpoint The equation-of-state at high ρB chiral symmetry restoration at high ρB Observables excitation function and flow of strangeness and charm collective flow of hadrons particle production at threshold energies excitation function of event-by-event fluctuations excitation function of low-mass lepton pairs in-medium modifications of hadrons (ρ,ω,φ → e+e-(µ+µ-), D) non twisted part connector p K D. Kresan Au + Au @ 25GeV Kaon acceptance depends critically on TOF resolution Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Backup Slides Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Backup Slides Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Selection cuts in ana_hits.C 80 W 1 ns Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Selection cuts in ana_hits.C 80 W 1 ns Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Time – velocity correlation Step 1 (after init_calib) Step 2 1 ns Ingo Deppner RPC 2016 Gent 22 - 26.02.2016

Results vs. Differential single stack MRPC with 8 gas gaps Differential double stack MRPC with 2 x 4 gas gaps vs. Ingo Deppner RPC 2016 Gent 22 - 26.02.2016