OVERVIEW OF SPECIFICATIONS

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EEEMCal Design Requirements

Coverage: -4 < eta < ~-1

  • Inner: Rin=15cm, Rout=49cm (-3.75 < eta < -2.5)
  • Outer: Rin=49cm, Rout=133cm (-2.5 < eta < ~-1.5)

Egamma:

  • Inner: 20 MeV – 20 GeV
  • Outer: 50 MeV – 20 GeV

Energy resolution:

  • Inner: 1%+2.5%/sqrtE + 1%/E
  • Outer: 2%+4%/sqrtE + 2%/E

Spatial resolution: 1+3%/sqrtE

Time resolution:

Typical signal size: <1V

Sampling rate: 250 MHz

Peaking time: ~4ns

Digitization gate: ~(100-200) ns

Signal rate: =<1 MHz/channel

Signal dynamics

  • 2V dynamic range
  • ADC 12 bits (0.4095)
  • ~5 MeV/count
  • ADC threshold: ~15 MeV (3 counts)

Maximum annual dose: ~ 3krad/year (30 Gy/year) EM; 1010 n/cm2 hadronic at top luminosity

Photo Detector: 6x6mm2 SiPM (13360; 25um cell)

Number of channels:

Data sparsification/feature extraction:

  • Peak (amplitude)
  • Integral
  • Time
  • Pedestal
  • Number of samples
  • Pulse quality
  • Pileup detection and recovery


Readout Example JLab:

  • fADC-250 MHz 12 bit, 16 channels/VME slot;
  • 3us buffer;
  • FPGA processing of waveform: zero suppression, pulse integral, max amplitude timing (<1 ns) -> readout;
  • VXS: for L1 trigger or for Streaming Readout