EIC Detector Geometry
Interaction Point 6

Region Component Sub-Component WBS Length
(cm)
Inner
Radius
(cm)
Outer
Radius
(cm)
Offset
from
Center
(cm)
Physical
Start
(cm)
Physical
End
(cm)
Volume
(m3)
Weight
(kg)
Technology Notes
HADRON
DIRECTION
END CAP
Hadron Calorimeter
6.10.06 140 17.5 267 359.6 359.6 499.6 27.65 177,068 FeSc, WSc last segment Tower size: 5cm x 5cm x 140cm including 10cm readout
Offset: measured from face nearest to interaction point
Volume: calculated as cylindrical volume minus the volume of the embedded ECAL
Weight: estimated as 79% iron and 21% plastic
Electromagnetic Calorimeter
6.10.05 30 14.0 195 329.6 329.6 359.6 3.57 23,048 Pb/Sc Tower size: 2.5 cm x 2.5 cm x 30 cm including readout 10cm
Offset: measured from face nearest to interaction point
Weight: estimated as 85% lead glass and 15% steel
Service Gap 9 320 320 329 Offset: measured from location nearest to interaction point
CENTRAL
DETECTOR
Dual RICH 6.10.04 120 15.0 185 180 195 315 11.43 2,123 Aerogel/Gas Offset: measured from face nearest to interaction point
Volume: calculated as sum of the sub-sections
Weight: based on parametric estimate from CLAS LTCC
Detector Section 100 15.0 185 215 215 315 10.68 Offset: measured from face nearest to interaction point
Aerogel Section 20 15.0 110 195 195 215 0.75 Offset: measured from face nearest to interaction point
HD Time of Flight/Tracker 6.10.03 15 8 67 180 180 195 0.21 42 AC/LGAD Offset: measured from face nearest to interaction point
Weight: based on parametric estimate from SBS Gem
Barrel Hadron Calorimeter 6.10.06 639.2 268.2 0 -319.6 319.6 72.22 462,406 FeSc Offset: measured from center of detector
Volume: calculated as sum of the sub-sections
Weight: estimated as 79% iron and 21% plastic
HD Section 170 195.3 268.2 150 150 320 18.05 Offset: measured from face nearest to interaction point
Central Section 300 183.3 268.2 0 -150 150 36.13 Offset: measured from center of detector
LD Section 170 195.3 268.2 -150 -320 -150 18.05 Offset: measured from face nearest to interaction point
Solenoid Magnet 6.10.07 384 142 177 -10 -202 182 13.47 45,956 Solenoid Weight: based on parametric estimate from CLEO II
Barrel EMCal* EMCal Outer Support 492.2 132 141 -293.9 198.3 3.80 5,965 Steel Weight: calculated as 20% of total volume as steel (balance is air)
EMCal Outer Surface 492.2 130.5 131.5 -45 -293.9 198.3 0.41 1,098 Aluminum Weight: calculated as 100% Aluminum
EMCal Electronics 492.2 120.5 130.5 -45 -293.9 198.3 3.88 7,617 Near eta=0 Weight: calculated as 25% silicon (balance is air)
Barrel EMcal 6.10.05 492.2 80.5 120.5 -45 -293.9 198.3 12.43 43,613 Sci Glass Weight: based on parametric estimate from CMS EMCal
EMCal Inner Surface 492.2 78.55 80.5 -45 -293.9 198.3 0.48 Aluminum Weight: calculated as Air and 100% Aluminum
Offset (Air) 492.2 78.85 80.5 -45 -293.9 198.3 0.41 Air Air
Aluminum plate 492.2 78.55 78.85 -45 -293.9 198.3 0.07 198 Aluminum Weight: calculated as 100% Aluminum
DIRC Support 458 65 79 -273 -273 185 1.33 523 Steel Offset: measured from point where DIRC bar connects to the readout
Volume: calculated as sum of sub-sections
Weight: estimated as 5% of total volume as steel (balance is air & detector)
Dirc Bar + MPGD Support 458 70 75 -273 -273 185 1.04
Readout Support 30 70 105 -273 -273 -303 0.29 Readout support is triangular frame, therefore volume is halved.
Integrated DIRC/MPGD Detector 6.10.04 488 71.5 76.5 -303 -303 185 0.86 661 Fused silica bars Detector is totally enclosed by DIRC Support. This is the entire envelope of the detector + readout
Weight: calculated as sum of sub-components
MPGD Tracker 342 73 75 -197 -197 145 0.32 64 muRWell (plane type) Weight: based on parametric estimate from SBS Gem
DIRC Bar Box 458 70 73 -273 -273 185 0.62 430 Weight: calculated as 30% quartz (balance is air & support system)
DIRC Readout 30 70 100 -273 -273 -303 0.24 168 Readout is triangular, therefore volume is halved.
Weight: Calculated as 30% silicon(balance is air & support system)
Barrel Time of Flight/Tracker 6.10.03 270 63 66 0 -120 120 0.33 66 AC/LGAD Weight: based on parametric estimate from SBS Gem
Length in z needs to be determined
Inner Tracker (Si, MPGD) Alternative based on pfRICH see line 43 6.10.03 310 3.62 60 0 -130 180 3.49 528 MAPS Weight: calculated as 3% aluminum and 3% silicon (balance is air)
Modular RICH Alternative Technology pfRICH, see line 38 6.10.04 42.7 8.0 63 -130 -130 -172.7 0.52 97 Aerogel Offset: measured from face nearest to interaction point
Weight: based on parametric estimate from CLAS LTCC
LD EMCal 6.10.05 60 9.0 63 -174 -174 -234 0.73 4,738 PbWO4 Offset: measured from face nearest to interaction point
Weight: estimated as 85% lead glass and 15% steel
Service Gap 10 -320 -320 -330 0.00 Offset: measured from location nearest to interaction point
LEPTON
DIRECTION
ENDCAP
Backward HCal HCal 6.10.06 45 12.4 275 -329.6 -329.6 -374.6 Iron/SC Offset: measured from face nearest to interaction point
Weight: calculated as 100% iron.
Flux Return 20.32 12.9 271.3 -375 -375 -395.32 Iron Offset: measured from face nearest to interaction point
Weight: calculated as 100% iron.
CENTRAL
DETECTOR
ALTERNATIVES
Proximity Focusing RICH Alternative Technology to mRICH, see line 28 6.10.04 54.1 8.0 63 -118.6 -118.6 -172.7 0.66 0 Aerogel + Gas Offset: measured from face nearest to interaction point
Weight: based on parametric estimate from CLAS LTCC
Barrel EMCal Alternative Imaging Part 6.10.05 434.5 78.3 92.25 -257 -257 177.5 3.26 Pb+Sc+Si
Sampling Part 434.5 93.3 117 -257 -257 177.5 6.82 PB+Sc
LD Readout Electronics 15 78.3 117 -272 -257 -272 0.36
HD Readout Electronics 15 78.3 117 177.5 177.5 192.5 0.36
Inner Tracker (Si, MPGD) Alternative based on pfRICH 6.10.03 298.6 3.6 60 0 -118.6 180 3.36 19 MAPS This envelope includes the Si disks in the lepton and hadron direction as wel las the barrel tracker. Weight: calculated as 3% aluminum and 3% silicon (balance is air)