OVERVIEW OF SPECIFICATIONS
EEEMCal Design Requirements
PRESENT DESIGN PARAMETERS (2023)
Coverage: -4 < eta < ~-1
- Rin=9cm, Rout=63cm (-X < eta < -XX)
- Length: 60cm
- Offset from center: -175cm
- Physical Start: -235cm
- Physical End: -175cm
- Weight: ~5000kg
Number of channels: 3000
Egamma: 20 MeV – 20 GeV
Energy resolution: 1%+2.5%/sqrtE + 1%/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 (Hamamatsu S14160-6010PS; 10um cell)
- Pixel pitch: 10um
- Number of pixels: 359011
- 4 SiPM per crystal: 1.4M pixels per crystal
- Spectral response range: 290-900nm (peak sensitivity: 460 nm)
- PDE: 18%
- Breakdown voltage: 38 V
- DCR: typical 3.0/Max 20.0 Mcps
- Gain: 1.8E05
- Temperature coefficient: 34 mV/degC
- Capacitance/channel: 2.5 nF
Pre-amp:
- Linearity: < 0.5%
- Gain stability: <0.5%
- Peak time: 20ns
- Charge resolution: 14-bit
FEB, RDO:
- SiPM bias montoring
- Temperature monitoring
- FEB on detector
Data sparsification/feature extraction:
- Peak (amplitude)
- Integral
- Time
- Pedestal
- Number of samples
- Pulse quality
- Pileup detection and recovery
NUMBERS FROM 2021 DETECTOR PROPOSAL DEVELOPMENT - SUPERSEDED
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