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DAQ Subsystem

DAQ Subsystem. Christopher Crawford University of Kentucky Robert Grzywacz University of Tennessee April 18 2012 DoE, Germantown MD. Data Collection WBS Elements. 1.10 Data collection systems $426k + 25% 1.10.01 Detector Readout Electronics $349k + 23%

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DAQ Subsystem

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  1. DAQ Subsystem Christopher Crawford University of Kentucky Robert Grzywacz University of Tennessee April 18 2012 DoE, Germantown MD

  2. Data Collection WBS Elements • 1.10 Data collection systems $426k + 25% • 1.10.01 Detector Readout Electronics $349k + 23% • 1.10.02 Slow Control $ 4k + 20% • 1.10.03 HV System $ 73k + 36% • * Covered by DOE Project funds Detector DAQ in its Faraday Cage (WBS 1.10)

  3. WPS 1.10.01 Detector Readout Electronics $349k + 25% Scope: • Read out waveform (energy + timing) of each pixel 2 x 128 ch. • offline pulse shape analysis for improved resolution and PID • Form e-p coincidences • 50 – 750 keV prompt electron • 30 keV proton (HV) delayed by 12 – 40 μs TOF • Nearest neighbour coincidences for background rejection • Energy and Timing Resolution • 2 keV energy resolution of electron 12 bit ADC – must sum energy in adjacent pixels and opposite detector • 10 ns TOF resolution of proton; 100 ps systematic 100 MHz – detection of initial proton direction in backscattered events • HV Optical Isolation • 30 kV potential between detectors and ground

  4. Detector Schematic

  5. PIXIE-16 Waveform Digitizers trigger logic

  6. PIXIE-16 Waveform Digitizers Filter ADC FPGA

  7. Trigger and Readout • Event / Data rate • < 5000/s decay rate in active volume; 600/s protons in upper detector • Coincident electron in adjacent pixel (7/127), either top or bottom detector • Accidentals from decay products <1% for 40 us coincidence window • PIXIE-16 waveform digitizer: 100 MHz sample rate, 12 bit ADC • 14 pixels * 1 us * 100 MS/s * 12 bit * 5000 /s = 11 MB/s; 12 TB / 2 weeks • Trigger scheme • Trigger levels: 1) DIGITIZER threshold, 2) FPGA readout, 3) CPU storage • Trigger separately on protons / electrons, form coincidences in software • Energy sum trigger for adjacent pixels – detection of lower-threshold events • Read out 6 neighboring pixels around trigger • Local trigger decisions based on hit information from other modules: digitizer FPGA main FGPA readout hits fiber optics PXI bus trigger lines rear I/O module

  8. WPS 1.10.01 Detector Readout Electronics $349k + 25% Work: • Design/procure/test prototype system Mar 2012-Apr 2013 • Design and construct optical isolation rear I/O module convert existing CAT5 cable to fiber optic • FIPPI FPGA firmware upgrades – engineers at XIA • Overlapping event readout • Low-threshold trigger • Main FPGA (trigger) firmware upgrades – XIA • Multichannel readout (lookup table) • Energy summing trigger • Procure remaining channels assemble and test complete system Apr 2013-Jan 2014

  9. WBS 1.10.02 Slow Control $4k + 20% Scope: Record operating conditions of detector - temperatures, pressures, beamline current Control movement of shutters; start/stop DAQ Work: Based on the NPDGamma slow control system - procure computer, and I/O cards - modify software developed for Nab data - test system before delivery to ORNL Schedule: Oct 2013 – May 2014

  10. WBS 1.10.03 HV System $73k + 36% Scope: Faraday cage for digitizers, preamp power supplies HV supply and isolation transformer for power Umbilical cord with signals, power, and cooling Work: Design support structure and shielding SNS HV safety review Build cables, testing Schedule: Jan 2014 – May 2015 * This system will be based on similar systems used in aSPECT and aCORN experiments

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