Far-Forward Tracking and Calorimetry

The Far Forward region consists of four zones:

Tracker and EMCal in B0 magnet

• Approximate acceptance 7<θ<20 mrad and |φ|<120 deg, with theta relative to the ion beam line

FFQ magnet string

• Cold bore (~20K). No detectors. Possible future upgrade with superconducting nano wire trackers, of particular interest for strange baryon decays, e.g. Λ → p π⁻

Off-Momentum Trackers

• RP stations between 25 and 36 m downstream of IP
  • AC-LGAD (timing & tracking)
  • SiO2 Cherenkov radiator (δZ resolution by signal amplitude ∼Z²)
• Approximate acceptance for 0.45<x_L<0.95
  • 0≤ θ < 5mrad and
  • 

Zero Degree Calorimeter (ZDC)

• EMCal and HCal, 36-38 m from IP
  • Neutron acceptance 0<θ_IP < (6 mrad) − (2 mrad)*cos(φ)

Secondary Focus RP trackers

• • AC-LGAD and thin SiO2 Cherenkov radiator
  • Acceptance (P/Z = 275 GeV, could be different at P/A=41 GeV)
    • Estimated from: A. Jentsch, indico.bnl.gov/event/12068
    •