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	HD Flux Return (Collar)			170	269	326.2	414.6	329.6	499.6	18.18	142,679	Iron	Offset: measured from center. Weight estimated as 100% iron.
	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
	HD Flux Return (Oculus)			22.2	195	267	340.7	329.6	351.8	2.32	18,205	Iron	Offset: measured from center. Weight estimated as 100% iron.
	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			9.6			320	320	329.6				Offset: measured from location nearest to interaction point
CENTRAL DETECTOR	Dual RICH		6.10.04	120	14.0	180	320	200	320	10.47	1,946	Aerogel/Gas	Offset: measured from face farthest from the interaction point Volume: calculated as sum of the sub-sections Weight: based on parametric estimate from CLAS LTCC
		Detector Section		94	14.0	180	226	226	320	9.51			Offset: measured from face nearest to interaction point
		Aerogel Section		26	14.0	109.413	200	200	226	0.96			Offset: measured from face nearest to interaction point
	HD Time of Flight/Tracker		6.10.03	15	8	60	180	180	195	0.17	33	AC/LGAD	Offset: measured from face nearest to interaction point Weight: based on parametric estimate from SBS Gem
	Barrel Flux Return			640	269	326.2	0	-320	320	68.45	349,145	Iron	Offset: measured from center. Weight estimated as 65% iron.
	Barrel Hadron Calorimeter		6.10.06	639.25	180.0	268.2	0	-319.625	319.625	73.71	471,922	FeSc	Offset: measured from center. Volume: calculated as sum of the sub-sections Weight: estimated as 79% iron and 21% plastic
		HD Section		169.625	194.25	268.2	234.813	150	319.625	18.22			Offset: measured from face nearest to interaction point
		Central Section		300	180.0	268.2	0	-150	150	37.26			Offset: measured from center of detector
		LD Section		169.625	194.25	268.2	-234.81	-319.625	-150	18.22			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 HD EMCal Support			26.67	115.8	194	200	186.665	213.335	2.03	7,399	Steel	Offset: measured from center. Weight estimated as 100% steel.
		Exterior Plate		26.67	185.4	194	200	186.665	213.335	0.27	2,146	Steel	Offset: measured from center. Weight estimated as 100% steel.
		Support Ring		10.16	115.8	185.4	200	194.92	205.08	0.67	5,253	Steel	Offset: measured from center. Weight estimated as 100% steel.
	Barrel EMCal		6.10.05	470	81.0	116	-38.75	-273.75	196.25	9.54	32,719
		Exterior Cover		460.0	114	116	-38.75	-268.75	191.25	0.66			Material needs to be specified for weight calculation
		Imaging Part		440	81.0	96	-38.75	-258.75	181.25	3.67	12,875	Pb+Sc+Si	Weight: based on parametric estimate from CMS EMCal
		Sampling Part		440	96.0	114	-38.75	-258.75	181.25	5.23	18,330	PB+Sc	Weight: based on parametric estimate from CMS EMCal
		LD Readout Electronics		15	81.0	116	-258.75	-273.75	-258.75	0.32	757		Offset: measured from face nearest to interaction point. Weight calculated as silicon.
		HD Readout Electronics		15	81.0	116	181.25	181.25	196.25	0.32	757		Offset: measured from face nearest to interaction point. Weight calculated as silicon.
	Barrel LD EMCal Support			26.67	115.8	194	-222.25	-235.585	-208.915	2.03	7,399	Steel	Offset: measured from center. Weight estimated as 100% steel.
		Exterior Plate		26.67	185.4	194	-222.25	-235.585	-208.915	0.27	2,146	Steel	Offset: measured from center. Weight estimated as 100% steel.
		Support Ring		10.16	115.8	185.4	-222.25	-227.33	-217.17	0.67	5,253	Steel	Offset: measured from center. Weight estimated as 100% steel.
	Integrated DIRC/MPGD Detector		6.10.04	488	72.5	108	-273	-303	185	3.09	1,344		Detector is totally enclosed by DIRC Support. This is the entire envelope of the detector + readout Weight: calculated as sum of sub-components
		Dirc Bar/MPGD Support		458	73.3	81	-273	-273	185	1.71	671	Steel	DIRC Support is surrounded by a 1/2 centimeter cover constructed from 48 segments. Weight: estimated as 5% of total volume as steel (balance is air & detector)
		DIRC Readout Support		30	73.3	108	-273	-303	-273	0.30	116	Steel	Readout support is triangular frame, therefore volume is halved. Weight: estimated as 5% of total volume as steel (balance is air & detector)
		DIRC Bar Box		458	75.5	78.6	-273	-273	185	0.69	478	Fused silica bars	Weight: calculated as 30% quartz (balance is air & support system) Offset measured from connection point between readout and bar box.
		Inner MPGD		339	72.5	75	5	-164.5	174.5	0.39	79	MPGD	Weight: based on parametric estimate from SBS Gem Offset: measured from center.
	Barrel Time of Flight/Tracker		6.10.03	289	56	63	27	-117.5	171.5	0.76	151	AC/LGAD	Weight: based on parametric estimate from SBS Gem Length in z needs to be determined
	HD MPGD 2			2.5	7.014	50	161	161	163.5	0.02	3.85414078		Weight: based on parametric estimate from SBS Gem Offset: measured from face nearest to interaction point
	HD MPGD 1			2.5	7.014	50	148	148	150.5	0.02	3.85414078		Weight: based on parametric estimate from SBS Gem Offset: measured from face nearest to interaction point
	Inner Tracker (Micromegas)		6.10.03	265	49.75	51	12.5	-120	145	0.02	6	MPGD	Weight: calculated as sum of sub-components
		Micromega 1		70	49.75	50	78	43	113	0.01	1	MPGD	Weight: based on parametric estimate from SBS Gem Offset measured from center.
		Micromega 2		70	50.75	51	110	75	145	0.01	1	MPGD	Weight: based on parametric estimate from SBS Gem Offset measured from center.
		Micromega 3		70	50.75	51	-85	-120	-50	0.01	1	MPGD	Weight: based on parametric estimate from SBS Gem Offset measured from center.
		Micromega 4		70	51.75	52	5	-30	40	0.01	1	MPGD	Weight: based on parametric estimate from SBS Gem Offset measured from center.
		Micromega 5		70	52.75	53	-10	-45	25	0.01	1	MPGD	Weight: based on parametric estimate from SBS Gem Offset measured from center.
	Inner Tracker (Si Barrel)		6.10.03	80	3.6	42.5	0	-40	40	0.02	40	MAPS	Weight: calculated as sum of sub-components
		Si Layer 1		27	3.6	4.1	0	-13.5	13.5	0.00	1	Silicon	Offset measured from center.
		Si Layer 2		27	4.8	5.3	0	-13.5	13.5	0.00	1	Silicon	Offset measured from center.
		Si Layer 3		27	12	12.5	0	-13.5	13.5	0.00	2	Silicon	Offset measured from center.
		Si Layer 4		54	27	27.5	0	-27	27	0.00	11	Silicon	Offset measured from center.
		Si Layer 5		80	42	42.5	0	-40	40	0.01	25	Silicon	Offset measured from center.
	Inner Tracker (Si Disks)		6.10.03	242.5	3.676	43	15	-106.25	136.25	0.71	397	MAPS	Weight: calculated as sum of sub-components
		HD Disk 1		2.5	3.676	23	25	23.75	26.25	0.00	9	Silicon	Offset: measured from center.
		HD Disk 2		2.5	3.676	43	45	43.75	46.25	0.01	34	Silicon	Offset: measured from center.
		HD Disk 3		2.5	3.842	43	70	68.75	71.25	0.01	34	Silicon	Offset: measured from center.
		HD Disk 4		2.5	5.443	43	100	98.75	101.25	0.01	33	Silicon	Offset: measured from center.
		HD Disk 5		2.5	7.014	43	135	133.75	136.25	0.01	33	Silicon	Offset: measured from center.
		LD Disk 1		2.5	3.676	23	-25	-26.25	-23.75	0.00	9	Silicon	Offset: measured from center.
		LD Disk 2		2.5	3.676	43	-45	-46.25	-43.75	0.01	34	Silicon	Offset: measured from center.
		LD Disk 3		2.5	3.676	43	-65	-66.25	-63.75	0.01	34	Silicon	Offset: measured from center.
		LD Disk 4		2.5	4.00614	43	-85	-86.25	-83.75	0.01	34	Silicon	Offset: measured from center.
		LD Disk 5		2.5	4.63529	43	-105	-106.25	-103.75	0.01	33	Silicon	Offset: measured from center.
	LD MPGD 1			2.5	4.635	50	-110	-112.5	-110	0.02	3.89772228		Weight: based on parametric estimate from SBS Gem Offset: measured from face nearest to interaction point
	LD MPGD 2			2.5	4.635	50	-120	-122.5	-120	0.02	3.89772228		Weight: based on parametric estimate from SBS Gem Offset: measured from face nearest to interaction point
	Proximity Focusing RICH		6.10.04	45	8.0	63	-146	-168.5	-123.5	0.55	102.577594	Aerogel + Gas	Alternative Technology to mRICH Offset: measured from center. Weight: based on parametric estimate from CLAS LTCC
	LD EMCal		6.10.05	60	9.0	63	-175	-235	-175	0.73	4,738	PbWO4	Offset: measured from face nearest to interaction point Weight: estimated as 85% lead glass and 15% steel
	Service Gap			11			-320	-331	-320				Offset: measured from location nearest to interaction point
LEPTON DIRECTION ENDCAP	LD Flux Return (Oculus)			28.5	213.6	267	-345.25	-359.5	-331	2.30	18,031	Iron	Offset: measured from center. Weight estimated as 100% iron.
	LD Flux Return (Collar)			120.4	269	326.2	-391.2	-451.4	-331	12.88	101,051	Iron	Offset: measured from center. Weight estimated as 100% iron.
	Backward HCal		6.10.06	45	12.4	267	-395	-440	-395	10.06	64,390	FeSc, WSc	Offset: measured from face nearest to interaction point Weight: estimated as 79% iron and 21% plastic
	LD Flux Return (Exterior)			10	12.4	267	-445	-450	-440	2.23	17,536	Iron	Offset: measured from center. Weight estimated as 100% iron.
DESIGN ALTERNATIVES
CENTRAL DETECTOR ALTERNATIVES	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
	Barrel EMCal Alternative		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
	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)

Comments, References and Contact Information

The information provided on this page is generated directly from the originating spreadsheet. The data in this section should provide insights into the design choices that have been made over time, along with references to documentation regarding the changes. To request clarification or changes to this information (or to information in the geometry matrix), please reach out to the individuals listed in the Contacts section.

Comments

Author
Date
Comment
Tanja Horn

April 12, 2022

Consolidation of ECCE DB with Athena format
Tanja Horn

April 13, 2022

Initial Detector-1 DB posted
Tanja Horn

May 19, 2022

Fixed inconsistencies in DIRC frame, hpDIRC and MPGD:
Iterated hpDIRC position as balance between phi-coverage and frame engineering strength need;
added 2-cm space for MPGD tracker (muRWell or MM) on top of DIRC bar boxes --> now 5cm slot for both together;
added slots for service needs in frame
Tanja Horn

June 24, 2022

Development of EIC Geometry Management System complete
Tanja Horn

July 01, 2022

First release of the geometry and master parameter table
Tanja Horn

August 22, 2022

At the request of the GD/I WG added explicitly space for an inner MPGD barrel tracker. Additional detail:
In the ECCE geometry table, the two barrel muRWell trackers (R=33, 51 cm) are lumped with the silicon tracker as 'Inner Tracker' extending from R=3-51 cm, plus a detector-free space from R=51-60 cm (low mass BdL region for enhancing low momentum tracking)
In the 24-June-2022 EPIC geometry table [https://eic.jlab.org/Geometry/Detector/Detector-20220624102507.html], silicon tracker extends from R=3-45.9cm. Nonetheless, there is a detector-free space from R=45.9-63 cm
The current simulation campaign setup include one muRWell layer at R=51 cm too. And I agree it is prudent to leave the space to allow inner MPGD barrel tracker, if the tracking study find them needed.
Tanja Horn

September 05, 2022

At request of the EIC Project Leads updated the dimensions in the Hadron Endcap. Additional detail:
dRICH: Length changed to 120cm; gas length changed to 100cm starting at z=215cm; aerogel length remains at 20cm starting now at 195cm
EMCAL: length remains at 38cm; start remains at z=328cm
HCAL: changed length to 142cm (including readout); front face starts at z=358cm
Total length of the Hadron endcap so that ends at z=500cm
Tanja Horn

September 05, 2022

Fixed the labeling of the columns "Physical Start" and "Physical End"
Tanja Horn

September 29, 2022

At request of the EIC Project Leads: overall update on detector envelopes consistent with the mechanical CAD model was implemented. Additional detail:
Hadron endcap HCAL: position adjusted
Hadron endcap EMCal: position adjusted, inner radius adjusted, and fixed a typo in the length
Barrel HCAL: length and outer radius adjusted
Barrel EMCal: positions adjusted
Solenoid: added offset from center 10 cm to allow for barrel EMCal (independent of technology) support structure and servides; adjusted positions
Electron Endcap mRICH: adjusted length, outer radius (including 2 cm of support structure), and positions
Electron Endcap TOF: REMOVED
Electron Endcap EMCal: position adjusted for hermeticity with barrel EMCal, inner radius adjusted
Electron Endcap HCAL: Added a line for the HCAL and its properties
Alternative technologies: Added lines for pfRICH, imaging barrel EMCal, and tracking based on pfRICH option
Tanja Horn

October 13, 2022

At request of the EIC Project Leads: correct the Barrel EMCal Inner Surface components
3mm aluminum plate
~1.65cm offset (air) from the short ends of the SciGlass blocks
Note that the spreadsheet is designed to work with the assumption of radial symmetry and homogeneity
Walt Akers

December 01, 2022

Performing a consistency update to ensure proper alignment of all formulas.
Tanja Horn/Walt Akers

January 08, 2023

Added Inner Tracker details for both Silicon and MPGD, updated backward EMCal and custom beam pipe flange
Tanja Horn/Walt Akers

September 29, 2023

Overall updates so that the geometry database has the detector envelopes following the September 2023 engineering CAD model. Note also that new models
matching the present detector designs have been included in the Sketchup menagerie. See: https://eic.jlab.org/Menagerie/ in the Current Release section.

A CSV version of this data can be found at https://eic.jlab.org/Geometry/Detector/local/D/DetectorParameterTable-20230929.csv
Tanja Horn/Walt Akers

October 13, 2023

Small updates to fix typos in the Inner Tracker (Si Barrel) section: Si Layer 3 radius to 120mm and Si Layer 5 radius to 420mm
Tanja Horn/Walt Akers

October 20, 2023

Update to fix logic calculating the service gap between lepton direction endgap and barrel. The correct size of the service gap is 15cm.
Tanja Horn/Walt Akers

October 31, 2023

Update to barrel hadron calorimeter lengths. Based on the engineering drawings there is no offset from center for the central section. This results in the following lengths: 169.625cm for both HD and LD sections and 300cm for the central section. The overall length of the detector is 639.25cm. Numerical updates were also made to the outer radius of all sections and the inner radius of the HD and LD sections. The updated values are: 268.2cm (outer radius) and 194.25cm (inner radius HD and LD).

References

Title
Date
Description
Detector Menagerie

A complete collection of Sketchup models that can be used to construct detector systems from parts. Each of the sub-components is independently configurable.
A collection of CAD/Step files that provided by other sources or are being developed in coordination with the Menagerie models to test strength and deflection

Contacts

Name
E-Mail
Details
Tanja Horn

hornt@cua.edu

Primary contact for information that is stored in the Detector Geometry Matrix.
Walt Akers

akers@jlab.org

Technical contact for online data, features and accessibility.