Interaction Region and Detector IP Ultra forward hadron detection dipole Low-Q2 electron detection Large aperture electron quads Small diameter ion quads Small angle Central detector with endcaps ~50 mrad crossing EM Calorimeter Hadron Calorimeter Muon Detector Solenoid yoke + Hadronic Calorimeter Solenoid yoke + Muon Detector HTCC RICH Tracking 5 m solenoid

Interaction Region Physics Magnets Electron quads 3.5 m from IP 0.3 m 3 cm bore 100 T/m outer edge < 8.5 cm (i.e. block up to 1.5 deg) Dipole 5 m from IP 0.8-1.0 m 2 Tm 1-5 deg B @ e- beam < 20 G Dipole 18 m from IP 3.5 m 20 Tm gap +/- 20 cm Crossing angle dipole Large aperture electron quads Small diameter ion quads Ion quads 7, 9, 13 m from IP 1.2, 2.4, 1.2 m 14, 24, 34 cm bore 89, 51, 36 T/m Outer edge < 20, 30, 50 cm B @ e- beam < 10 G Solenoid 5 m long 2 – 4 T Return Yoke can be here (at +/- 5 meters)

Physics Magnet Specifications crab crossing angle 50 mrad max B field for SC magnet 6 T Length Peak field peak field gradient aperture (radius) acceptance angle requirement distance from IP acceptance angle e & p beamline separation T/m cm deg m mm Detector solenoid 5 2 to 4 500 - 300 Detector dipole 1 0.8-1.0 2.5-2.0 250 Detector dipole 2 3.5 20 18 900 electron final focusing quad 1 0.3 109 1.5 175 electron final focusing quad 2 96 4 200 ion final focusing quad 1 1.2 89 6.74 >0.5 7 0.55180573 350 ion final focusing quad 2 2.4 51 11.76 9 0.74896507 450 ion final focusing quad 3 35.7 16.81 13 0.74073469 650

Estimate of the detector magnetic field (Bz) QFF1 QFF2 QFFL QFFP ~2 kG 4 3 2 1 Tesla The detector magnetic field will have a significant impact on the beams. Some of the final focusing elements will have to work in this field.

Hall C Horizontal Bend(HB) SC Magnet Cutaway (shown with HMS Q1) Superferric “C” magnet 2.6 Tesla 21cmx25cm warm bore 0.75 M EFL 1.93 TM 19 % design margin 220 KJ stored Energy SC is SSC outer cable SHMS: reaches down to (central) angle of 5.5 deg at distance of ~1.5 meter MEIC: @ distance of 5 meters reaches down to very small angles would like to cover angle range between 1 and 5 degrees or down to 8.5 cm and up to 42.5 cm

Separation of Electron and Ion Beams