CERN, November 25, 2003 – Technical Board Support chariot for ITS & FMD services on the RB24 side Foreward –This presentation reports the current ideas to solve the problem of moving the ITS services out of the PMD acceptance cone –To fit in the existing installation procedure, the chariot supporting the ITS and FMD services is made of two, upper and lower, halves –There are still 4 identified open problems, which will be described in details; therefore the present procedure should not be considered as a finalized design L.Simonetti

CERN, November 25, 2003 – Technical Board Y-Z plane cut-view of the ITS+FMD services and of their support chariots Conical section of the service chariot 1 st patch panel for ITS & FMD Support of 1 st patch panel (fixed to the cylindrical section of the service chariot) Cylindrical section of the service chariot Fixation between conical and cylindrical sections of the service chariot Clearance between the TPC and the service chariot 2 nd patch panel Fixation of the service chariot to the TPC service wheel ITS rails beam axis Maximum radius of ITS services & support to allow for TPC sliding-in PMD Temporary cylindrical support of the movable section of the services Int. Point TPC cone

CERN, November 25, 2003 – Technical Board Interferences with the PMD 840 mm (  = 2.18) 740 mm (  = 2.3) 56.3 TPC PMD 9.4° 13.1 ° CP ° ● The minimum clearance with respect to the TPC thermal screen (~20mm), ● the radial thickness of the services (~50mm), ● the presently estimated thickness of the conical section of the chariot (30mm), seem to limit the opening angle of the services to 11.6º 11.6º

CERN, November 25, 2003 – Technical Board Axonometric view of the service trays (upper half chariot) Fixed cylindrical section of the ITS & FMD services Movable section of the ITS & FMD service trays: cylindrical during TPC sliding-in conical when TPC is on Int. Point Hinges of the cable trays 1 st problem: they require flexible pipes (plastic or metal bellows) and prevent tight fastening of cables 1 out of 11 cable trays per quadrant 2 lowered cable trays to allow the TPC sliding-in (room for the tools used for hanging ITS to the TPC) TPC ITS

CERN, November 25, 2003 – Technical Board View of the support chariot and of its tools “Cylindrical” support of the 1 st patch panel for ITS and FMD services (fixed to the cylindrical section of the ITS-service chariot) Cylindrical section of the service chariot with its wheels Conical section of the service chariot with its wheels Temporary cylindrical support of the (closed) service trays, with its wheels rolling on ITS rails Temporary arms supporting the conical section onto the ITS rails Tool to lift the whole chariot in cantilever mode by pushing onto the TPC service wheel Tools to link the base plane of the conical section with the plane of the TPC service wheel. It also lifts the outer end of the chariot.

CERN, November 25, 2003 – Technical Board View of ITS & FMD services assembled onto the whole support chariot

CERN, November 25, 2003 – Technical Board Chariot installation – step 1 ♦ In laboratory, for both the upper and lower half-chariots: ► Services are assembled into their trays ► Fixed section of the trays are assembled onto the chariot cylindrical section ► Movable section of the trays are fixed to the temporary cylindrical support 1 st patch panel for ITS & FMD Support of 1 st patch panel (fixed to the cylindrical section of the service chariot)

CERN, November 25, 2003 – Technical Board Chariot installation – step 2 ♦ Both the upper and lower (not shown) half-chariots are mounted onto the ITS rails and slid through the TPC ♦ Services are then connected to ITS and FMD at the 1 st patch panel TPC TPC Service Support Wheels (SSW)

CERN, November 25, 2003 – Technical Board Chariot installation – step 2 (cut view on Y-Z plane) RB26 TPC SSW TPC 280 mm160 mm C3 and C4 fixation points of ITS rails

CERN, November 25, 2003 – Technical Board Chariot installation – step 3 beam pipe chariot vacuum valve with its chariot ♦ The TPC slides to the nominal position

CERN, November 25, 2003 – Technical Board Chariot installation – step 4 ♦ For both the upper and lower (not shown) half- chariots: ►the conical section of the chariot is slid in ►with appropriate tools it is bolted to the cylindrical section

CERN, November 25, 2003 – Technical Board Chariot installation – step 4 (cut view on Y-Z plane) RB24 TPC SSW TPC 430 mm 320 mm

CERN, November 25, 2003 – Technical Board Chariot installation – step 5 ♦ Two adjustment tools with hinges, mounted on the conical section, are used to find the effective position of the TPC SSW and, then, to bolt the conical section to the SSW. ● They allow to require an SSW positioning accuracy of  2mm

CERN, November 25, 2003 – Technical Board Chariot installation – step 6 ♦ The service trays are opened and fixed to the conical section of the upper and lower chariots ♦ The temporay cylindrical support of the service trays are removed

CERN, November 25, 2003 – Technical Board ♦ The service trails are opened and fixed to the conical section of the chariot. 2 nd problem: the trails nearest to the horizontal plane clash with the C4 support of the ITS rails  1 trails out of 11 should be removed and the services redistributed into 10 trays; feasibility to be verified. Chariot installation – step 6 - problem C4

CERN, November 25, 2003 – Technical Board Chariot installation – step 7a ♦ The third support-point of the beam pipe is fixed by means of the usual 4 wires and collar 3 rd problem: the procedure to execute this step has not yet been completely defined. In particular: ● Fixations of the wires to the TPC face (which has good positioning accuracy) have to be agreed upon with the TPC group (for both the position and the compatibility with the ~400 N wire tension preliminarily requested by the beam pipe group) ● Space between two cable trays has to be provided for the wire feed-through ● Angles of the wires have to be agreed upon with the beam pipe group

CERN, November 25, 2003 – Technical Board ♦ The chariot of the beam pipe and the one of the vacuum valve are removed Chariot installation – step 7b

CERN, November 25, 2003 – Technical Board ♦ The upper and lower chariots are raised in cantilever mode by using the tool (1), pushing onto the TPC SSW, and by exploiting the hinges included in the tools (2) 4 th problem: The stiffness of the TPC SSW has to be verified together with the TPC group Chariot installation – step 8 122

CERN, November 25, 2003 – Technical Board Chariot installation – step 9 ♦ The ITS rails are removed

CERN, November 25, 2003 – Technical Board PMD installation