It isn’t advisable to move the TOF at any time unless it is necessary. Both of the walls can be moved on carts, which were designed by engineers in Poland. The cart can also be used as a stand during normal operation. There are many aspects to the cart that should be discussed first.

The cart has a pair of rails running along the top to where the TOF support structure rests. The support structure is locked into placed placing a mandrel into a raised hole that is between the two rails. The rails allow the support structure to be slide on and off the cart easily. There are horizontal and vertical adjustments on the cart. The horizontal adjustments allow movement parallel and perpendicular to the rails on the cart. Parallel adjustment screw is found at one end of the cart near the top. There are four perpendicular adjustment screws located along the topsides of the cart. You can loosen them to adjust the TOF position, and then tighten them again to secure the wall in place. The vertical position is adjusted by screwing three bolts located underneath the sliding plates. Furthermore, the carts are given wheels that can move up and down in order allow the wall to rest on three floor plates, which are drilled into the floor. The wall is secured in place with respect to the floor using large brass dowel pins that slide into aluminum lined holes through the floor plates and in the floor and using floor clamps.

The wall on the floor has to be moved aside to pull out the wall in the magnet. To move the wall on the floor side, a few cables need to be disconnected. After turning off the Camac crate and stopping the Camac controls VI, the GPIB cable can be disconnected. The sum output cable from the trigger discriminator has to be disconnected. The test-input cables don’t need to be disconnected, but they have to be loosened as to have enough slack for the move. Finally, The high voltage and signal cables for the LED boxes need to be removed. Any other cables that do not have enough slack have to be removed as well, and a check of the set up should be preformed before the wall is moved and cables are ripped out of their sockets.

Once all necessary cables are removed, the wall on the floor can be unclamped from the floor. There are three floor clamps holding the wall in place, which need to be unscrewed from the floor. After the floor clamps are removed, the dowel pins that sink into the floor need to be retracted. They are held in place with a large brass pull pin being inserted into the hole through the dowel pin. The cart’s wheels can now be raised such that the weight of the cart is solely on the four wheels. The wall can be moved to the side where there are three extra holes for the clamps to be inserted. Once the wall is in the proper place over the three clamp holes, screw the clamps in the holes to hold the wall in place and out of the way.

Since the outer wall is out of the way, the inner wall’s cart can be attached to the magnet support structure in order to remove the inner wall. The cart’s height should be properly aligned such that the brass dowel pins on the side of the cart easily slide into the brass holes in the angle bracket attached to the magnet. At a proper height, the cart can be rolled up against the angle bracket and attached to it by using the brass bolts, which need to be removed before the cart is rolled into place.

With the cart in place, all the cabling in the back of the patch panel below the wall has to be removed and tied up to the TOF support structure. The cables going into the LED boxes have to be removed as well. After a final check that all the necessary cabling is removed, the wall is ready to be slide on the cart.

The only place to grab the wall to slide it either in or out is by the blue handles on either end of the wall and at the base of the support structure. There is a locking pin that runs through the base of the wall and needs to be lifted before the wall is slide out of the magnet. Also, the alignment between the rails on the cart with the rails on the magnet needs to be correct. One person needs to push on the negative z side of the magnet, while the other person can pull from the other side while lifting the locking pin. After the wall is on the cart, it can be worked on or moved around easily.

To put the wall back in, the cart has to be attached to the angle bracket on the magnet. All the necessary alignments should be checked, and the wall should slide in and lock into place with the locking pin. A survey of the wall shouldn’t be necessary unless an adjustment of greater than 1mm is made.