This is R2S0, used for assemble/fabrication testing and to test install and tension transfer. This pic was taken from the instrumentation clean room set up near the alley entry at ODU.
This is R2S0, used for assemble/fabrication testing and to test install and tension transfer. This pic was taken from the instrumentation clean room set up near the alley entry at ODU.
Sector ZERO was built using all standard components with the out of spec endplates. Yellow rope was initially used to simulate HV cables.
Real HV cables with a carrier was added to check for interferences.
The added weight changed the CG for rigging.
If you look close, the internal spring tensioners are visible on the right side.
I designed these shock absorber setups for transportation. One under each pneumatic wheel.
These were nitrogen charged shocks with adjustable damping and spring pre-load.
The shock absorbers could be mounted at different angles to make the ride softer. Multiple locations were available to mount the shocks to the deck of the crate.
We had to have a crate built to transport the detectors. The detector was too wide to fit inside a truck. We added the tarps to prevent the wood from rotting due to the weather. We had to stiffen it up and install a door in order to make it work. Besides the $3000 cost of the crate, we had to purchase an air compressor, 1/2 " drive impact, tarps, wood for ramps, misc hardware for the door and ramps. You can see the ramps we made in the pic on their sides. We pulled the detector up the ramps using a cable winch and exited out the door.
Here is sector ZERO ready for the trip. Note the holes on the shock absorber boxes for the straps. The shocks were bolted to the deck using lag bolts. An automotive hydraulic jack was used to lift up the detector and slide the shock absorber under the wheels. here may look like alot of space on the sides, but less than 4 inches of clearance was available on each side due to boards and HV cable runs.
A fairly simple thing like transportation can turn out to be a complex and expensive task. Just how do you load a crate that size onto a truck and get it through the tunnel? A crane and low boy trailer is how.
This cost $1500 each trip for a full rigging crew, crane, and tractor trailer.
Here is a close up view of the shock absorber and how the wheels set in it. Talk about 4 wheel independant suspension.
The door was needed to get the shock absorbers and jack in for the nose end of the detector.
The crate is the same as a boat. They used boat slings and spreader bars to load the crate. The crate deck was a heavy pallet. The base was strapped to the trailer.
The R2 installation fixture thing. I will say it was really big, really expensive, and it worked. Lucky we had lots of people back then, this was very manpower intensive.
We added a stop and a lock for obvious reasons during the R2 S0 test install.
Sector ZERO was an important test of the entire process from the assembly to final tension transfer. As you can see if you look close, the 2 downstream most carbon fiber posts had to be removed from the magnet in order to slide the detector in.
The frame was attached to rails that ran on captured rollers. The alignment from the fixture was manual. It rolled off the fixture guides and onto the ones installed on the torus. The ones on the torus were surveyed into place.
The required fall protection back in the day was only a belt and lanyard.
Aluminum covers were used to cover and protect the carbon fiber rods. The cold ring can be seen in the left of the photo. The space frame did not as yet have the panel 4 mounting weldments installed.
This view is now completely blocked by added steel and thousands of cables. Again the cold ring at the left.
Here at the bottom of the pic, you can see the lower rail and upstream roller guide. The covers had to be removed from the carbon fiber rods due to the rails hitting them.
The test lab crane was not always available for our use. The EEL door was too low to fit into. A crane was required to lift the sides and top of the crate off.
This was the first complete R2 detector delivered for installation.
The truck was an air ride type. We specified not to exceed 45mph, the min speed for I64.
Lots of plastic and duct tape to protect the assembly.
The shock absorbers were adjusted to have max travel but not bottom out. A rubber stopper on the shock shaft was adjusted to show max travel.
With the crate top and sides removed, it could be backed into the EEL for unloading.
This was a nice clear Fall day.
After the long ride, Mac took the detector out for a walk. He had to yank the leash a bit to keep it inline.
The detector was then loaded onto the Hall B truck at the time for it's trip into the hall.
The old truck was much lower than the one we have now.
As you can see the hall entry roll up door is at an angle to the ramp. This makes for a tighter fit than you may think.
Due to the close proximity of the lifting swivles with the detector electronics, 24 ft long straps were required to lift the detector to the installation fixture.
The wheels are removed and the assemble is lifted up to the fixture.
