Electron Ring IP Region Optics Fanglei Lin MEIC R&D Meeting, JLab, February 12, 2015 F. Lin

New Detector Region ion e- 1.6 m 1.4 m 2.4 m 3 m 2.6 m e- ion Endcap 5 m Central detector IP Electron ring FFQs (permanent and electric quads) can be placed in the two endcaps.

Baseline Upstream FFQs (@ 10 GeV) Max. x= 7 mm *=(10,2)cm 3 m e- 0.5 m elec. 29 T/m, rinner = 2 cm, router = 9 cm 1 m ion spectrometer  0.5 m, perm., 30 T/m, rinner = 2 cm, router = 3 cm x= 4 mm x= 2.4 mm 0.5 m elec. 41 T/m, rinner = 4 cm, router = 11 cm

New Upstream FFQs (@ 10 GeV)  2.4 m 0.5 m elec. 43 T/m, rinner = 5 cm, router = 10 cm 1 m ion spectrometer 0.5 m, perm., 28 T/m, rinner = 2 cm, router = 2.7 cm 0.5 m, perm., 35 T/m, rinner = 2 cm, router = 3 cm Max. x = 4.2 mm *=(10,2)cm x= 1.9 mm Max. y = 3 mm 0.5 m elec. 37 T/m, rinner = 3 cm, router= 6 cm

Baseline Downstream FFQs (@ 10 GeV)  3.2 m 0.6 m, elec., 48 T/m 0.3 m, perm., 0 T/m *=(10,2)cm 1.5 m Max. x= 4.9 mm 0.4 m, elec., 62 T/m 0.3 m, elec., 29 T/m 7.8 m

New Downstream FFQs (@ 10 GeV) 0.7 m, elec., 62 T/m, rinner = 4 cm 0.5 m, perm., 39 T/m, rinner = 2.5 or 3 cm, router = 4.8 or 7 cm ~ 8 cm separation of ion and e- beams OR 0.5 m, elec. quad shared by two beams e-  2.2m 1.6 m 7.8 m *=(10,2)cm Max. x = 3.1 mm x = 1.2 mm Max. y = 2.3 mm 0.7 m, elec., 41 T/m, , rinner = 8 cm 0.5 m, elec., 8 T/m, , rinner = 8 cm Outer radii are limited by the beam separation

Downstream FFQs + Chicane Baseline New

Back Up

“Round” Beam Upstream FFQs (@ 10 GeV) 0.5 m elec. 16 T/m 1 m ion spectrometer  0.7 m, perm., 44 T/m, rinner = 2 cm, router = 3.5 cm 0.7 m, perm., 45 T/m, rinner = 3 cm, router = 9 cm Max. x= 4.1 mm *=(10,2)cm x= 2.1 mm

“Round” Beam Downstream FFQs (@ 10 GeV) 0.7, 0.7, 0.5 m elec. 55, 41, 7 T/m 0.5 m, perm., 19 T/m, rinner = 3 cm, router = 4 cm e-  2.2m 1.6 m 7.8 m *=(10,2)cm Max. x = 3.8 mm x = 1.2 mm

Baseline Round beam Flat beam Or