Detector Assembly and Cryogenics Requirements for ILD Project
The ILD project involves assembling detectors using pre-assembled pieces on surface and lowering them into the assembly area. The detectors are equipped with various components like muon detectors, solenoids, and calorimeters. Magnetic field measurements are carried out during the assembly process. Cryogenics requirements include helium compressors and cold boxes positioned strategically for efficient operation. Specialized cranes are used for yoke assembly. The assembly areas in both Baseline and Hybrid-A options are detailed, depicting the specific tasks carried out in each area.
- Detector Assembly
- ILD Project
- Cryogenics Requirements
- Helium Compressors
- Magnetic Field Measurements
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DH in Hybrid-A and ILD 2014/9/5 Yasuhiro Sugimoto 1
ILD assembly scheme Baseline option Detector is pre-assembled on surface up to <200 ton (400 ton for solenoid) pieces These pieces are transported to DH and assembled to a complete detector Sub-detectors are installed in DH Magnetic field measurement is carried out in DH We need plenty of space for detector assembly and installation in DH Hybrid-A option Detector consisting of 5 rings is mostly assembled on surface Each ring is lowered to DH using 4000 ton gantry crane Muon detector, solenoid, and calorimeters are installed on surface Magnetic field measurement is carried out on surface after barrel calorimeter installation Trackers are installed in DH 2
ILD yoke 3
DH assembly area in Baseline option Area 1: Platform YB0 assembly Barrel detectors installation/cabling Endcap calorimeters installation Area 2/3: Alcoves Endcap calorimeters cabling QD0 support tube assembly FCAL install/cabling Area 4: Tentative platform on beam line side YE, YB+, YB- (iron yoke and muon detector) assembly/install/cabling Area 5: Loading area side HCAL rings assembly Tooling assembly Storage area Beam line Area4 50m Area3 Area2 Area1 71m Alcove Alcove Area5 Loading area Access tunnel Utility space (6F) 4
DH assembly area in Hybrid-A option Area 1: Platform Landing of lowered detector rings Barrel trackers installation/cabling Area 2/3: Alcoves QD0 support tube assembly FCAL install/cabling Beam line 50m Area3 Area2 Area1 54m Alcove Alcove Loading area Access tunnel 5
Requirements for cryogenics Baseline option He compressor in a compressor cavern located near the center of damping ring Cold box on the detector platform or on the utility floor (6F) Hybrid-A option He compressor on surface He gas pipes through 18m shaft Cold box on the detector (YB0) 6
Cranes in DH for ILD Baseline option One 250 ton crane for yoke assembly One 80 ton crane for CAL installation Another 250 ton crane (borrowed from SiD) for solenoid installation 5 ton cranes in alcoves for end-cap CAL and FCAL installation Hybrid-A option One 40 ton crane for tracker installation Another 40 ton crane (borrowed from SiD) for CAL maintenance, if needed 5 (or 2.5?) ton cranes in alcoves for FCAL installation (If a >80 ton piece has to be taken out from DH, 250 ton crane of assembly hall will be used) 7
DH size Height In Hybrid-A option, smaller cranes than baseline option are needed Therefore DH height (space above crane rails) could be slightly smaller than Baseline option (by ~2.4m?) Length In Hybrid-A option, assembly area at both ends of DH needed in Baseline option can be reduced Loading area at both ends is still necessary for sub-detector installation and detector maintenance L=108m seems OK (track of trailer in the loading area has to be seriously studied) DH in Baseline option 8
DH size 108m 28m 28m Platform moving jacks 4.5m 3m 6.5m 2m 3m 3m Cable trench Trailer (L=16.5m) Crane accessible area 9
Assembly schedule Baseline option In the new estimate by J- Power (ALCW2014), DH construction takes much longer time than TDR: 54 months 68 months (62 months if land forming period is subtracted) ILD will be ready for commissioning with beam in 9 year from the beginning of land forming (8.5 years from the beginning of excavation) Hybrid-A option In the estimate by J-Power at ALCW2014, DH construction takes 62 months, which is not the critical path Assembly hall construction period and detector assembly period on surface are critical If assembly hall can be constructed in 2 years, ILD will be ready for commissioning with beam 8.5 year from the beginning of land forming (8 years from the beginning of excavation) Hybrid-A option can make ILD schedule earlier by 0.5 year 10
Assembly schedule Baseline Hybrid-A 11
