Interaction Region and Detector

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

2. ion quads dipole Large aperture electron quads dipole dipole Small diameter electron quads 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 • 18 m from IP • 3.5 m • 20 Tm • gap +/- 20 cm • Dipole • 5 m from IP • 0.8-1.0 m • 2 Tm • 1-5 deg • B @ e- beam < 20 G • 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) Crossing angle

3. Physics Magnet Specifications

4. 4 3 Tesla 2 1 QFFP QFFP QFFL QFF2 QFF1 QFF1 QFF2 QFFL ~2 kG Estimate of the detector magnetic field (Bz) 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.

5. 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

6. Separation of Electron and Ion Beams