Commissioning and Initial Performance of the Belle II itop PID Subdetector
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1 Commissioning and Initial Performance of the Belle II itop PID Subdetector Gary Varner University of Hawaii TIPP 2017 Beijing
2 Upgrading PID Performance - PID (π/κ) detectors - Inside current calorimeter - Use less material and allow more tracking volume Available geometry defines form factor - Barrel PID Aerogel RICH 1.2m e - 8.0GeV 2.6m e + 3.5GeV TIPP 2017 Beijing 2
3 imaging TOP (itop) Concept: Use best of both TOP (timing) and DIRC while fit in Belle PID envelope NIM A623 (2010) BaBar DIRC Use wide bars like proposed TOP counter TIPP 2017 Beijing Use new, high-performance MCP-PMTs for sub-50ps single p.e. TTS Use simultaneous T, θc [measuredpredicted] for maximum K/π separation Optimize pixel size 3
4 Space-time correlations itop relativistic velocity TIPP 2017 Beijing Beam Test Data These are cumulative distributions 4
5 Actual PID is event-by-event Test most probable distribution TIPP 2017 Beijing 5
6 Performance Requirements (TOP) Single photon timing for MCP-PMTs σ <~ 10ps (ideal waveform sampling) To include T0, clock distrib, timebase ctrl σ ~ 38.4ps NIM A602 (2009) 438 σ T0 = 25ps σ <~ 50ps target NOTE: this is single-photon timing, not event start-time T 0 TIPP 2017 Beijing 6
7 Mechanical constraints A highly constrained space TIPP 2017 Beijing 7
8 Quartz: procurement, verification Quartz optics Bars: 1250 x 450 x 20 mm 3 two bars per module Mirrors: 100 x 450 x 20 mm 3 Prisms: 100 mm long, 456 x 20 mm 2 at bar face expanding to 456 x 50 cm 2 at MCPPMTs Material: Corning 7980 DIN58927 class 0 material has no inclusions (inclusions 0.1 mm diameter are disregarded) Grade F (or superior) material having index homogeneity of 5 ppm over the clear aperture of the blank; verified at nm Birefringence / Residual strain 1 nm/cm DOE Review TIPP of 2017 Belle Beijing II Operations 8
9 Quartz gluing, Module Assembly Module production process TIPP 2017 Beijing DOE Review of Belle II Operations 9
10 itop Readout Waveform sampling ASIC 64 DAQ fiber transceivers 8k channels 1k 8-ch. ASICs 64 board stacks Low-jitter clock 64 FINESSE 16 COPPER 2x UT3 Trigger modules 64 SRM TIPP 2017 Beijing Clock, trigger, programming module (FTSW) 8 FTSW 10
11 Readout Verification (pre-install, in-situ) Single photon timing < 100 ps Event Time zero < 50 ps Trigger time (single photon) < 10 ns Pulser testing TIPP 2017 Beijing 11
12 Installation Installation (very tight fit) TIPP 2017 Beijing 12
13 Installation completed Installation Complete (May 2016) TIPP 2017 Beijing 13 13
14 After installation continued development Installation completed These studies used raw waveform readout; need Feature Extracted version (subsequent effort) TIPP 2017 Beijing 14 14
15 0, B-field Cosmic Ray Analysis Efficiency correction, artifact removal is tricky/difficult Artifact contribution (Need improved FW) TIPP 2017 Beijing Further studies were defered for a couple months by PMT motion discovery (outcome of these studies) 15
16 PMT Rotation Update (2 rotation issues) Study of physics impact of decoupled PMTs (Modest effect) Plan in place to replace ~50% of PMTs 16
17 Start-up Schedule/Commissioning Integrate DAQ (now) Global Cosmic Ray Run (with B-field) Phase II startup (early 2018) Configuration / Command/Acquistion Timing alignment Global Commissioning Trigger Development (refine) 30kHz L1 Buffer Mgmt (tuning) Low amplitude Feature Extraction FE Tuning 17
18 Timebase Calibration Took a while to get new FW release, SW work continued 18
19 Channel-by-channel Timing alignment Global timing alignment laser studies NOTE: Different Time Scales! 19
20 Region Of Interest & Feature Extraction Reference pulse Poised to take large data sets Single p.e. laser pulses Standard CFD algorithm works well, though performance degrades at low PMT (mandated to mitigate aging effects) 20
21 Low PMT Gain Operation Significant improvement at low pulse heights Necessary to maximize MCP lifetime Studying how best to implement (Zynq: PS is too slow(?), PL option) 21
22 22 Summary Belle II TOP Detector coming online Present: Production Firmware debugging DAQ integration and initial timing alignment Global Cosmic Ray Campaign: Detector alignment Magnetic field tracking First collisions (early 2018): Verify detector alignment Initial PID release
23 Back-up slides 23
24 30kHz L1, high occupancy emulation 30kHz L1 trigger, 10 MHz background photons/pmt, multi-hit, multi-event buffering At 400 SSTin Cycles (~19us per single photon hit), can run at 50kHz, so plenty of margin 24
25 Gain and Efficiency 25
26 PMT Replacement 1x BG 26
27 PERFORMANCE SUMMARIES 27
28 28 Single photon timing All installed channels 1 entry per channel Limited statistics Note: CAMAC TDC and phototube TTS contributions included: actual resolution is better
29 Verification: Event Time Zero Hawaii Tested U. South Carolina Tested (higher noise) Obj Thresh 29
30 Verification: Event Trigger Time Note: Using coarser AXI clock during production testing. 4x faster clock (expect 4x improved resolution) in final trigger firmware [not yet ready] Trigger time resolution [ns] 30
31 Hit maps from in-situ cosmic ray tests Yes voltage turned down September 5,
32 IRSX ASIC Overview Die Photograph 8 channels per 2.8 GSa/s Samples stored, 12-bit digitized in groups of 64 32k samples per channel (11.6us at 2.8GSa/s) Compact ASICs implementation: Trigger comparator and thresholding on chip On chip ADC Multi-hit buffering ~8mm 32
33 Laser Calibration steps 1. Pedestal subtract 2. Correct Amplitude dependence 3. Run dt Minimizer, obtain results 4. Apply dt values All binned, so easily implemented at Look-up tables on the SCROD FPGA Both gain/efficiency and timing data taken at same time About 8 hours per 128 channel board stack 33
34 1. Ped subtract & 50% CFD Measure peak to determine 50% threshold Before pedestal subtraction Determine timing from interpolation Default samples are ~ 0.37ns/point 34
35 1. After 50% CFD algorithm No corrections applied TDC assumed exactly 25ps/lsb TDC INL not considered Kinematic p.e. recoil tail 35
36 2. Voltage dependence 36
37 2. Improved Residual 37
38 2. TDC resolution residual Differential and Integral non-linearity in sampling timebase (expected for these types of Switched Capacitor Array ASICs) 38
39 3. After Autocalibration Compare with previous slide timebase uniform and absolute timing calibrated (clock period closure constraint) 39
40 Output After dt minimizer algorithm Time between pulses in agreement, No matter where look in the window Absolute timebase cross-calibrated With respect to SSTin clock period 40
41 Production single photon testing 41 ~31ps TDC+phase SL-10 TTS ~35ps IRSX electronics: ~33ps Use SSTin period constraint to calibrate absolute timebase
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