AEROGEL

1. AEROGEL • Assembly of Cells into 80-cell Array: • 8 cells wide by 10 cells high - 1204 mm high (Y) by 2077 mm wide (Z) by about 335 mm deep (X); weight estimated at about 400 Lb. Plus cables. • Two identical arrays make up the Aerogel detector, with one cabled and serviced from the north end, and the other cabled and serviced from the south end. Once installed in the west carriage, only the outer ends are accessible. • The array structure is designed to hang cells from vertical G-10 strips attached to an upper backbone, consisting of a pair of 4 x 1.5 inch channels running the full width in “Z”. • The array is supported during assembly by two trolleys riding on the 6-inch I-beam of a rolling gantry. Trolleys are attached to upper backbone. • Cable trays run in “Z” above the array on each side of the backbone to route cables from the outer end of the array to the top of each column of cells. • A box containing 20 pre-amps is attached to the outer end of each array within the envelope of the basic array dimensions P. Kroon

4. AEROGEL • Installation in West Carriage • The north and south arrays will be supported in the west carriage by a 14-foot I-beam running N-S between and attached to the pad chamber support towers. The attachment scheme provides an adjustment in Y so the support beam and attached arrays can be raised after installation by about 5 inches. This is to get the structure and cables as close to the edge of the EMCal acceptance as possible. • Both arrays are installed from the south side of the west carriage, with the north array going first. • After assembly, cabling and test, each array will be prepared for installation by coiling all attached cables on the outer (pre-amp) end of the array, within the X-Y shadow of the array. • The array will be transported to Bldg.1008 on its gantry, and rolled into the IR until it is reachable by the IR crane. The gantry I-beam is then lifted with the array and moved into position south of the west carriage, and attached to a transition beam running between the lift beam and the support beam. P. Kroon

6. AEROGEL • Installation in West Carriage • The array is then rolled from the lift beam to the support beam and positioned in Z. stops are installed to prevent further rolling. Stops are in place at all times except when intentional rolling is required • After both arrays are in place, the support beam can be raised to the operating position. • With the array in place, the cables are uncoiled and routed to their locations in the racks mounted on the west carriage sector 1 level P. Kroon

8. AEROGEL • Infrastructure • Two new rack platforms are being fabricated which will mount on the sides of the west carriage adjacent to sector1, with access by ladder. These are designed to accommodate two racks each and provide personnel access to the front of the racks and to the end of the Aerogel array with the pre-amp box. They will also be used during installation and cabling. The plan is for each new rack platform to have one wide rack and one narrow rack with appropriate services. • In order to provide access to the back (west end) of the new racks, the window washer previously used to access the back of the EMCal will be replaced with a new set of different length stages that will provide access all across the back at the necessary levels. These stages will also raise up out of the way when the carriage is retracted. When in place, they will be at fixed height with simultaneous access to all EMCal levels without requiring use of harnesses. Access to these stages will require two more ladders and another small platform at the sector 2 level P. Kroon

12. AEROGEL