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
    • 

• ZDC, 36-38 m from IP
  • EMCal and HCal
  • 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
    •