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29-JUN-07

Compact, low-power and (deadtimeless) high timing precision photodetector readout G. Varner and L. Ruckman [University of Hawaii] J. Va’vra and J. Schwiening [SLAC]. 29-JUN-07. Progress in expensive PD recording Precision timing detection PROMPT concept T-492 beam test

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29-JUN-07

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  1. Compact, low-power and (deadtimeless) high timing precisionphotodetector readoutG. Varner and L. Ruckman [University of Hawaii]J. Va’vra and J. Schwiening [SLAC] PD '07 Kobe -- G. Varrner 29-JUN-07 • Progress in expensive PD recording • Precision timing detection • PROMPT concept • T-492 beam test • Next Generation readout concepts

  2. Inexpensive Options: FPGA based readout QDC Performance PD '07 Kobe -- G. Varrner J. Instr. 1 P07001 (2006) TDC Performance ~0.37ns ASIC: ATWD, DRS,others (KamLAND, IceCube, MEG, MAGIC)

  3. A Different kind of g Detector PD '07 Kobe -- G. Varrner • 20-30cm vs. 200-800nm (bandwidth 200-1200 MHz) • Completely solar powered (tight demands on power) • 324 chan. @ 2.6GSa/s ~320ps Measured ~7m Antarctic Impulsive Transient Antenna (ANITA)

  4. Large Analog Bandwidth Recorder and Digitizer with Ordered Readout [LABRADOR] PD '07 Kobe -- G. Varrner • Common STOP acquisition • 3.2 x 2.9 mm • Conversion in 21ms (all 2340 samples) • Data transfer takes 80ms • Ready for next event in ~50ms Straight Shot RF inputs • Switched Capacitor Array (SCA) • Massively parallel Wilkinson ADC array 8+1 chan. * 256+4 samples Random access:

  5. LAB3 Architecture Details PD '07 Kobe -- G. Varrner • No missing codes • Linearity as good as can make ramp • Can bracket range of interest

  6. LABRADOR sampling & linearity 12-bit ADC PD '07 Kobe -- G. Varrner • Excellent linearity • Sampling rates up to 4 GSa/s with voltage overdrive 2.6GSa/s

  7. Bandwidth Evaluation PD '07 Kobe -- G. Varrner Transient Impulse FFT Difference f3dB ~> 1.2GHz Frequency [GHz]

  8. PD '07 Kobe -- G. Varrner Jiwoo Nam UC Irvine

  9. Finer Calibration 600MHz Clock PD '07 Kobe -- G. Varrner Estimated Limit

  10. High Speed sampling PD '07 Kobe -- G. Varrner

  11. Precision Timing Recording Options PD '07 Kobe -- G. Varrner • Constant Fraction Discriminator + Multi-Hit TDC Without INL compensation • Good performance, but • CFD not compact, rate dependent (SLAC 16 channel card is 9U) • High-power, potentially noisy if inside detector • Buffer depth limitations (already an issue for TOF upgrade) Measurements from ALICE-TOF + After INL compensation

  12. Exploration Direction • For high channel counts, prefer to do the measurement at the photodetector (avoids cables which take up space and leads to dispersion for fast timing signals) • Noise (interference) inside detector • No fast discriminators (power/heat) • Precision timing  waveform sampling • Explore different photo-detectors • Highly integrated detector & electronics • Lower gain • Magnetic field robustness • Modular, cost effective in large volumes (Advanced focusing DIRC could be 250,000 channels) PD '07 Kobe -- G. Varrner

  13. Precision Timing Motivation (1) PD '07 Kobe -- G. Varrner Jerry Va’vra

  14. Motivation (2) --Chromatic Correction PD '07 Kobe -- G. Varrner

  15. Blank slide PD '07 Kobe -- G. Varrner Set-up in End Station A at SLAC, where did ANITA calibration

  16. Blank slide PD '07 Kobe -- G. Varrner 7 x 64 PMT channels (448 total), not enough SLAC electronics, proposal to instrument some with new electronics (prototyped under DOE Advanced Detector Research award)

  17. UH Prototype Readout Chain PD '07 Kobe -- G. Varrner G = 5x105 single p.e. ~1mV

  18. 64-channel Amplifier Stackbased on RF amplifiers (cheap, high BW) PD '07 Kobe -- G. Varrner Ribbon cable (differential analog) output Within MCP profile

  19. Integration Test Results PD '07 Kobe -- G. Varrner Scanning Test Set-up: Measured noise ~4mVrms Voltage Gain ~200 High bandwidth Raw signal

  20. 16 BLAB1 ASICs Differential inputs from amp boards PD '07 Kobe -- G. Varrner Processed hit times via CAMAC Full waveforms over USB2

  21. Buffered LABRADOR (BLAB1) ASIC PD '07 Kobe -- G. Varrner • 64k samples deep • Multi-MSa/s to Multi-GSa/s • 12-64us to form Global trigger 3mm x 2.8mm, TSMC 0.25um

  22. Buffered LABRADOR (BLAB1) ASIC PD '07 Kobe -- G. Varrner Measured Noise 1.8V dynamic range • 10 real bits of dynamic range 1.4mV

  23. BLAB1 Analog Bandwidth PD '07 Kobe -- G. Varrner • A few fixes (lower power, higher BW) • Multi-channel BLAB2 -3dB ~300MHz

  24. BLAB1 Sampling Speed Can store 13us at 5GSa/s (before wrapping around) PD '07 Kobe -- G. Varrner Single sample: 200/SQRT(12) ~ 58ps But, have Complete Waveform Information 200ps/sample

  25. 125MHz sine wave Pre-calibration PD '07 Kobe -- G. Varrner 6GSa/s

  26. 400MHz sine wave Calibration (1) PD '07 Kobe -- G. Varrner 6GSa/s Linear variation across chip Due to IR drop in feed voltage (can be improved) Extracted Period [ns] Storage Cell Number

  27. 6GSa/s Calibration (2) 400MHz sine wave PD '07 Kobe -- G. Varrner After basic linearity and bin-by-bin correction ~11ps intrinsic (~8ps possible) 15ps Linearity only Extracted Period [ns]

  28. Bench Test timing ~30ns pulse pair PD '07 Kobe -- G. Varrner 6GSa/s ~27ps for two edges ~20ps for each edge ~40ps for PMT like Signals (working on algorithm)

  29. Temperature Dependence PD '07 Kobe -- G. Varrner Sample aperature (172ps = 5.8GSa/s) 6GSa/s 0.2%/degree C (can correct) Matches SPICE simulation

  30. Typical single p.e. signal [Burle] Overshoot/ringing PD '07 Kobe -- G. Varrner Due to Higher bandwidth, “warts” of signal appear

  31. Measured Burle Cross-talk PD '07 Kobe -- G. Varrner With higher bandwidth, nature of ringing well seen. By measuring waveforms, some hope to correct Electronics only: <1% crosstalk Raw signal

  32. Interleaved Operation PD '07 Kobe -- G. Varrner • Single shot! • uncalibrated • room for improvement • push BW higher LARC ASIC: 64 chan @ 5 GSa/s = 384GSa/s Streak camera type applications – ps timing

  33. Vacuum MCP-PMT Issues • lower Q.E., fill factor • High voltage operation, longevity • High density packing • Magnetic field effects • Irreducible Manufacturing Costs PD '07 Kobe -- G. Varrner How to get to a large system? • SBIR with LightSpin Technologies • Proprietary Solid-State MCP demonstrator (1 x 1024) • No HV, high Q.E. (200 – 900nm!!) • Lower dark count rate than Si-PM • Mate with BLAB variant, determine timing resolution

  34. f-DIRC Array Concept PD '07 Kobe -- G. Varrner Many k Photodetector channels ASIC Single Module: (side-view) SiPMs/APDs Carrier Socket Tiled Array Readout Board

  35. Summary PD '07 Kobe -- G. Varrner • High Precision Timing Results • Initial results promising • No fundamental limit • Practical issues important (T0) • Plans: • T-492 test of f-DIRC (ESA SLAC) • LARC, BLAB2 ASICs • Direct integration test with MPPC/SS-MCP • Push PD technology • Future: • Low-costs in volume • Integrate amplifier for higher gain • Explore limits of analog BW/sampling

  36. Backup slide -- cables! PD '07 Kobe -- G. Varrner

  37. PD '07 Kobe -- G. Varrner

  38. Blank slide PD '07 Kobe -- G. Varrner

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