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 31.22 199,896 FeSc, WSc last segment Tower size: 5cm x 5cm x 140cm including 10cm readout
Offset: measured from face nearest to interaction point
Weight: estimated as 79% iron and 21% plastic
Electromagnetic Calorimeter
6.10.05 30 14.0 195 329.6 329.6 359.6 6.70 43,121 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
HCAL Collar 30 195.0 267 329.6 329.6 359.6 3.14 20,073 Offset: measured from face nearest to interaction point
Weight: estimated as 79% iron and 21% plastic
EMCAL 30 14.0 195 329.6 329.6 359.6 3.57 23,048 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 15.0 185 195 195 315 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 6.10.06 639.2 183.3 268.2 0 -319.6 319.6 72.12 461,789 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 170 195.3 268.2 149.6 149.6 319.6 18.05 Offset: measured from face nearest to interaction point
Central Section 299.2 183.3 268.2 0 -149.6 149.6 36.03 Offset: measured from center of detector
LD Section 170 195.3 268.2 -149.6 -319.6 -149.6 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 Support 497.91 132.85 142 -49.685 -298.64 199.27 3.93 6,176 Steel Weight: calculated as 20% of total volume as steel (balance is air)
Barrel EMCal 6.10.05 497.91 78.72 132.85 -49.685 -298.64 199.27 17.91 49,434 Weight: calculated as sum of sub-components
EMCal Outer Surface 497.91 130.5 132.85 -49.685 -298.64 199.27 0.97 2,623 Aluminum Weight: calculated as 100% Aluminum
EMCal Electronics 497.91 120.5 130.5 -49.685 -298.64 199.27 3.93 2,287 Near eta=0 Weight: calculated as 25% silicon (balance is air)
EMCal Crystals 497.91 80.5 120.5 -49.685 -298.64 199.27 12.58 44,119 Sci Glass Weight: based on parametric estimate from CMS EMCal
EMCal Inner Surface 497.91 80.2 80.5 -49.685 -298.64 199.27 0.08 204 Aluminum Weight: calculated as 100% Aluminum
Offset (Air) 497.91 79.02 80.2 -49.685 -298.64 199.27 0.29 0 Air Air
Aluminum plate 497.91 78.72 79.02 -49.685 -298.64 199.27 0.07 201 Aluminum Weight: calculated as 100% Aluminum
DIRC Support 488 70 75 -273 -303 185 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 -303 -273 0.29 Readout support is triangular frame, therefore volume is halved.
Integrated DIRC/MPGD Detector 6.10.04 488 70 75 -303 185 0.86 661 Detector is totally enclosed by DIRC Support. This is the entire envelope of the detector + readout
Weight: calculated as sum of sub-components
muRWell (plane type) 342 73 75 -26 -197 145 0.32 64 MPGD Weight: based on parametric estimate from SBS Gem
Offset measured from center.
DIRC Bar Box 458 70 73 -273 -273 185 0.62 430 Fused silica bars Weight: calculated as 30% quartz (balance is air & support system)
Offset measured from connection point between readout and bar box.
DIRC Readout 30 70 100 -273 -303 -273 0.24 168 Readout is triangular, therefore volume is halved.
Weight: Calculated as 30% silicon(balance is air & support system)
Offset measured from connection point between readout and bar box.
Barrel Time of Flight/Tracker 6.10.03 270 63 66 0 -135 135 0.33 66 AC/LGAD Weight: based on parametric estimate from SBS Gem
Length in z needs to be determined
Inner Tracker (Micromegas) 6.10.03 210 48.75 51.75 0 -105 105 0.14 36 MPGD Weight: calculated as sum of sub-components
Set 1 120 48.75 49.75 0 -60 60 0.04 7 MPGD Constructed from two 70mm micromegas.
Set 2 130 50.75 51.75 0 -65 65 0.04 8 MPGD Constructed from two 70mm micromegas.
Set 3 140 52.75 53.75 0 -70 70 0.02 5 MPGD Constructed from two 70mm micromegas.
Set 4 200 58.75 59.75 0 -100 100 0.04 7 MPGD Constructed from three 70mm micromegas.
Set 5 210 60.75 61.75 0 -105 105 0.04 8 MPGD Constructed from three 70mm micromegas.
Inner Tracker (Si) 6.10.03 252.5 3.62 60 0 -117.5 135 0.12 286 MAPS Alternative based on pfRICH (see alternatives table below)
Weight: calculated as sum of sub-components
HD Disk 1 2.5 3.676 23 25 23.75 26.25 0.00 9 Silicon
HD Disk 2 2.5 3.676 43 45 45 47.5 0.01 34 Silicon
HD Disk 3 2.5 3.842 43 70 67.5 70 0.01 34 Silicon
HD Disk 4 2.5 5.443 43 100 97.5 100 0.01 33 Silicon
HD Disk 5 2.5 7.014 43 135 132.5 135 0.01 33 Silicon
LD Disk 1 2.5 3.676 23 -25 -26.25 -23.75 0.00 9 Silicon
LD Disk 2 2.5 3.676 43 -45 -45 -42.5 0.01 34 Silicon
LD Disk 3 2.5 3.676 43 -65 -67.5 -65 0.01 34 Silicon
LD Disk 4 2.5 4.00614 43 -90 -92.5 -90 0.01 34 Silicon
LD Disk 5 2.5 4.63529 43 -115 -117.5 -115 0.01 33 Silicon
Modular RICH 6.10.04 42.7 8.0 63 -130 -172.7 -130 0.52 97 Aerogel Alternative Technology pfRICH (see alternatives table below)
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 -234 -174 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 Offset: measured from location nearest to interaction point
LEPTON
DIRECTION
ENDCAP
Backward HCal 6.10.06 45 11.2 267 -329.6 -374.6 -329.6 5.37 34,393 Iron/SC Offset: measured from face nearest to interaction point
Weight: calculated as 100% iron.
Flux Return End Plate 20.32 12.4 271.3 -375 -395.32 -375 4.69 36,794 Iron Offset: measured from face nearest to interaction point
Weight: calculated as 100% iron.
DESIGN ALTERNATIVES
CENTRAL
DETECTOR
ALTERNATIVES
Proximity Focusing RICH 6.10.04 54.1 8.0 63 -118.6 -172.7 118.6 0.66 0 Aerogel + Gas Alternative Technology to mRICH
Offset: measured from face nearest to interaction point
Weight: based on parametric estimate from CLAS LTCC
Barrel EMCal Alternative 6.10.05 479.5 78.3 117 -287 192.5 10.79 37,003
Imaging Part 434.5 78.3 92.25 -39.75 -257 177.5 3.26 11,430 Pb+Sc+Si Weight: based on parametric estimate from CMS EMCal
Sampling Part 434.5 93.3 117 -39.75 -257 177.5 6.82 23,911 PB+Sc Weight: based on parametric estimate from CMS EMCal
LD Readout Electronics 15 78.3 117 -272 -287 -272 0.36 831 Offset: measured from face nearest to interaction point.
Weight calculated as silicon.
HD Readout Electronics 15 78.3 117 177.5 177.5 192.5 0.36 831 Offset: measured from face nearest to interaction point.
Weight calculated as silicon.
Inner Tracker (Si, MPGD) 6.10.03 298.6 3.6 60 30.7 -118.6 180 3.36 509 MAPS Alternative based on pfRich.
This envelope includes the Si disks in the lepton and hadron direction as well as the barrel tracker.
Weight: calculated as 3% aluminum and 3% silicon (balance is air)