Support and Infrastructure

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1 Support and Infrastructure SoLID Director s Review Whit Seay February 23, 2014

Integrate this method into detector design.

2 SoLID Experimental Set-ups Design a system for mounting experimental apparatus that can be utilized by both set-ups. Integrate this method into detector design. Provide an efficient method to install, maintain, and repair subsystems and reduce downtime between the two experiments. 2

Design Concept for Magnet and Endcap To provide general access to the bore of the cryostat for subsystem installation the endcap must be moved downstream.

3 Design Concept for Magnet and Endcap To provide general access to the bore of the cryostat for subsystem installation the endcap must be moved downstream. The endcap will be designed to separate into two halves to allow for access to individual detector packages. This conveniently provides access to the calorimeter in the back of the endcap w/o having to remove all upstream detectors. 3

Hall A Floor Loading SoLID footprint 500 ton 500 ton 250 ton SoLID magnet and detectors encompass an area of 5.8 meters in diameter and 7.3 meters long.

4 Hall A Floor Loading SoLID footprint 500 ton 500 ton 250 ton SoLID magnet and detectors encompass an area of 5.8 meters in diameter and 7.3 meters long Clearance to the Hall floor ranges from 20 to 48 cm, sufficient for support. Weight of the CLEO-II magnet, detector hut and detectors is 1300 tons. The floor in this installation region is designed for 250 tons for a 12 square foot pad. Magnet = 1000 tons Endcap = 300 tons 4

Magnet Support The initial plan used for estimating the cost is to build a stationary frame and

5 Magnet Support The initial plan used for estimating the cost is to build a stationary frame and distribute the approximate 1000 ton load of the modified CLEO-II magnet section similar to Cornell approach. Steel plates and large steel blocks and/or large I-beams will be used to distribute the load over a safe area. The 200 ton jacks will be used for vertical alignment and allow for steel shims to be inserted to adjust the height. Outboard vertical supports provide additional load distribution. Hydraulic jacks on steel blocks Outboard support SoLID magnet support base (outboard supports not shown) 5

Each section of the nose will bolt to the main backplate which consists of a two piece round disk.

6 Endcap Design The endcap will be split vertically into halves and be capable of separation to allow for access to the detector packages. Each section of the nose will bolt to the main backplate which consists of a two piece round disk. The endcap nose with a secondary backing plate will be a cast two piece design to allow for separation. The two halves of the cylindrical outer ring will bolt to the corresponding backplate. 6

The initial design concept for the track system requires a set of longitudinal (downstream direction) tracks for moving the endcap away from the magnet.

7 Endcap Support The endcap will have a support structure that cradles each half of the cylinder. The structure will be integrated into a track system that is mounted to steel plates resting upon the concrete floor. The initial design concept for the track system requires a set of longitudinal (downstream direction) tracks for moving the endcap away from the magnet. A second set of tracks that would separate the endcap halves in the lateral direction would ride on top of the longitudinal tracks. Motion can be achieved by using hydraulic or electric cylinders to push and pull the entire system into position 7

Large Angle Detector and Baffle Installation The magnet will be located adjacent to the existing Hall A center pivot/target mount area and will have limited access to the front of the magnet.

8 Large Angle Detector and Baffle Installation The magnet will be located adjacent to the existing Hall A center pivot/target mount area and will have limited access to the front of the magnet. The insertion of the large angle detector packages that will reside internal to the cryostat will be accomplished from the downstream side of the magnet using a supporting framework to roll the packages in and out. An installation mechanism is needed to load the large angle detector packages and baffle system into the internal support structure This mechanism will likely be mounted to the longitudinal track system used for the endcap movement and can utilize the tracks for rolling the detectors and baffles into the cryostat and transferring the load to the internal frame. 8

Framework for Magnet Detectors An internal frame system is needed to mount the lead baffles in the PVDIS experiment. The frame cannot come into contact with the inside bore of the cryostat.

9 Framework for Magnet Detectors An internal frame system is needed to mount the lead baffles in the PVDIS experiment. The frame cannot come into contact with the inside bore of the cryostat. This requires the frame to span the entire length of the cryostat and mount to the return yoke iron. The rails of the frame will be fabricated from 4 inch diameter schedule 80 welded stainless steel pipe. Either 304 or 316 grade stainless is acceptable. The downstream end of the rails will have a hemispherical cap and a stainless steel foot welded on and will be bolted to the downstream collar. The upstream end of the rail will either be bolted or welded to an annular stainless steel plate. The upstream end of the frame will be mounted to the frontcup Since the frontcup has to be movable to balance the magnetic forces on the coils, the annular plate will be attached to the frontcup with studs. 9

Light Gas Cherenkov Installation The light gas Cherenkov will mount to the external downstream end of the magnet and will not traverse with endcap.

10 Light Gas Cherenkov Installation The light gas Cherenkov will mount to the external downstream end of the magnet and will not traverse with endcap. When the endcap is in the operational position the light gas Cherenkov will be enclosed within the cylindrical ring along with the rest of the forward angle detectors. A space frame similar to a scaffolding system would hold and position each section while being attached to magnet. The space frame would attach to the rail system and could be movable along the rails if needed. The space frame will be suitable for personnel access to allow workers to perform the installation and maintenance of the detectors. 10

Endcap Forward Angle Detector Installation The basic design concept for the detectors mounted inside the

cylindrical ring and on rails attached to the outer horizontal circumferential surface of the nose if

A counterweight balanced installation device that is slung from the crane can be used to orient and

11 Endcap Forward Angle Detector Installation The basic design concept for the detectors mounted inside the endcap will have them supported by individual rails mounted to the inner circumference of the cylindrical ring and on rails attached to the outer horizontal circumferential surface of the nose if needed. A counterweight balanced installation device that is slung from the crane can be used to orient and position each section onto the rails or a framework can be used that utilizes the rails mounted to the concrete floor. Personnel access to the endcap will be through man lifts and/or a specialized scaffolding as needed 11

upstream end of the endcap and make use of the common

12 Forward Angle Calorimeter Layout and Mounting Each section of the calorimeter will be loaded from the upstream end of the endcap and make use of the common rail system inside the endcap. ECal Mounting Design (ANL) 12

Heavy Gas Cherenkov Mounting The HG Cherenkov detector group is now favoring a

Each section of the will utilize the common rail system inside the endcap.

fixture using the overhead crane or a framework that rides on the rails

13 Heavy Gas Cherenkov Mounting The HG Cherenkov detector group is now favoring a 2 sector design 1 in each half of the endcap vs 6 sectors. Each section of the will utilize the common rail system inside the endcap. Detector sectors can be loaded into the endcap by a counterweighted lifting fixture using the overhead crane or a framework that rides on the rails attached to the concrete floor. This framework could double as scaffolding for personnel access to the detector. 13

14 Electrical and Cryogenic Requirements The projected electrical power load for the magnet is less than 1 MVA. A planned upgrade to the Hall A substation is scheduled prior to the running of SoLID and would bring the capacity up to 2 MVA. The CLEO-II magnet was designed to have a low cryogenic heat load with passive cooling. Oxford estimated heat load is 8.3 watts and 14 l/hr. The existing cryogenic system will be used to provide liquid helium to the 700 liter dewar. The HRS spectrometers will be offline during the SoLID run. The heat load is within the capacity of the current system in Hall A. The dewar has the capacity to maintain the magnet for 36 hours. The magnet requires two weeks to cool down while maintaining a 25º delta. Parameter Coil Electrical Operating current Coil inductance Stored energy Design Value 3300 A 4.6 H 25 MJ Cryogenics Coil operating temperature Coil working pressure Refrigeration load K bar 8.3 watts and 14 l/hr 14

15 Cost and Labor for Detector Supports A total of 23.4 FTE s estimated for detector supports and hall infrastructure. Estimates derived from recent projects at the lab. Labor was estimated using guidance from the Hall D solenoid installation Cost was estimated using guidance from Hall A SBS program. and Hall Infrastructure 15

16 Preliminary Structural Analysis Additional slides

Axial Magnetic Forces Acting on the Return Iron 0.008 0.2 8.1 108.6 165.5 122.9 0.7 110.2 171.2-238.4-119.2-20.3-269.0-79.6 0.7 0.04 0.

Maximum Von Mises stresses do not exceed 1500 psi (magnetic axial forces only) Maximum shear stress is approximately 750 psi and

17 Axial Magnetic Forces Acting on the Return Iron Values for axial force integrated over entire yoke (2π) Allowable yield stress for 1006 steel 15 ksi. Maximum Von Mises stresses do not exceed 1500 psi (magnetic axial forces only) Maximum shear stress is approximately 750 psi and acceptable (not shown) Maximum deflection is = mm where region 15 and 16 meet. Forces used for FEA model came from Eugene Chudakov s 2012 CLEO study. 17

Conservative simple restraint. Buckling analysis to be completed in the future.

18 New downstream coil collar External yoke supports similar to Cornell s approach not modeled (conservative). Allowable stress for 1006 hot rolled steel = psi. Peak stress due to rigid constraint at the bottom is the only overstress. Conservative simple restraint. Buckling analysis to be completed in the future. Forces due to 8 return yolk layers, 50% cryostat weight and 15 tons of detectors. Total forces applied to coil collar = 234 tons Max stress (non peak) = 14.4 ksi Peak stress at BC restraint 19.7 ksi 18

Forces due to gravity only Only overstress is from rigid constraint applied to the

19 Detector Hut Stress Analysis Half of the detector s weight placed on the outer shell and half on the nose. Forces due to gravity only Only overstress is from rigid constraint applied to the locations of the 4 legs. Weights: Heavy gas Cherenkov = 8 metric t (assumed) Calorimeter = 23 metric t W forward angle absorber = 13 metric t Outside Inside 19

Next Steps for SoLID Design and Engineering Participate in the disassembly of the CLEO magnet at Cornell Univ to gain valuable knowledge of the fit and function of all components.

20 Next Steps for SoLID Design and Engineering Participate in the disassembly of the CLEO magnet at Cornell Univ to gain valuable knowledge of the fit and function of all components. Use knowledge gained at Cornell to refine installation plan and schedule. Continue to work closely with the collaboration to further the experimental design and integration of the detector packages. Perform a more comprehensive stress analysis of major components. 20

Magnet, Support and Infrastructure. Whit Seay November 7, 2014

Magnet, Support and Infrastructure Whit Seay November 7, 2014 Engineering Progress Efforts in cost and labor estimate Contributions to pcdr document Visit to Cornell Dry Run - Magnet - Hall A Layout for