OVERVIEW OF SPECIFICATIONS

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