Sils ATLAS Meeting 18-9 October 2003 Mechanics for the Barrel SCT

Sils ATLAS Meeting 28-9 October 2003 Barrel SCT Mechanics - Specifications zFour stable cylindrical mechanical in carbon fibre - honeycomb sandwich (external dimensions are 568 / 710 / 854 / 996 mm diameter by 1530 mm length). zStable to <1 ppm/°C CTE in longitudinal and circumferential directions, o –20°C < T < +30°C.  0% < RH < 50% RH at constant temperature, dimensional change in all directions, < 30  m/m.  Under stable conditions (- 10±1°C and 20±1°C in dry N 2 ) changes in all directions, except through sandwich thickness, < 10  m/m/yr (2 point support in middle plane at both ends and 100 N/m 2 uniformly distributed) B3

Sils ATLAS Meeting 38-9 October 2003 Barrel SCT Mechanics - small parts Brackets and small components production. >40000 small pieces, some the same for the 4 barrels, some specific to each barrel type The bracket shells are time consuming to produce and are on the critical path. Laminate by Composite Design, Machining by UNI-GE All components by end October

Sils ATLAS Meeting 48-9 October 2003 Barrel SCT Mechanics - barrel 6 Dirty work on Barrels before shipment to RAL zBarrel 6 still in Geneva because of B3 delays at RAL zCounterdrilling of outer facing underneath pads uDone for B6, B5 and B4, two pads to be re-bonded on B4 zCheck/adjust mountability of brackets on pads, uDone for B6, B5, B4 zSurface preparation for bonding FSI system, uDone for B6, B5, B4

Sils ATLAS Meeting 58-9 October 2003 Barrel SCT Mechanics - barrel 6 Clean Work to be done for B6, B5 and B4 Cleaning cylinder Electrical continuity tests Mount brackets all screws tightened with torque controlled screwdrivers brackets have to be electrically isolated from cylinder Rough geometrical check. Visual inspection B3 -penetrations through thermal enclosure designed - support designed - tooling for support manufacture to do - interlink design to do

Sils ATLAS Meeting 68-9 October 2003 Barrel SCT Mechanics - dry assembly B3 + B6 B4 + B5 + B6

Sils ATLAS Meeting 78-9 October 2003 Barrel SCT Mechanics - assembly at RAL -delays! zOpto-harnesses are in production uBarrel LM tape production complete uBarrel-3 harnesses being evaluated uESD damage to DORIC ASIC & other production issues (cracked lines etc) B3 harness assembly at RAL

Sils ATLAS Meeting 88-9 October 2003 Barrel SCT Mechanics - assembly at RAL -delays! B3 cooling assembly at RAL Thermal enclosure a major problem

Sils ATLAS Meeting 98-9 October 2003 SCT Mechanics - integration of barrels at CERN

Sils ATLAS Meeting October 2003 Barrel SCT Mechanics - preparing SR1 reception Temporary enclosure DAQ system & readout DCS & power supplies Facility control & monitor (CIC) Cooling system Environmental Control & Interlock Detector services Environmental Gas From H. Pernegger