cern, november 25, 2003 – technical board support chariot for its & fmd services on the rb24...

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


Y-Z plane cut-view of the ITS+FMD services and of their support chariots

Conical section of the service chariot

1st patch panel for ITS & FMD

Support of 1st patch panel (fixed to the cylindrical section of the service chariot)

Cylindrical section of the service chariotFixation between conical

and cylindrical sections of the service chariot

Clearance between the TPC and the service chariot

2nd patch panel

Fixation of the service chariot to the TPC service wheel

ITS rails

beam axis Ma

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ra

diu

s o

f IT

S s

erv

ice

s &

su

pp

ort

to

allo

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TP

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lidin

g-i

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PMD

Temporary cylindrical support of the movable section of the services

Int. Point

TPC cone


Interferences with the PMD

840 mm ( =

2.18)

740 mm ( = 2.3)

56.3

TPCPMD

9.4°13.1°

840.

0

427.

1 599.

7

656.

0

2581.0

3615.0

CP

127.

7

11.6°742.

0

528.3

● 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


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 trays1st 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


View of the support chariot and of its tools

“Cylindrical” support of the 1st 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.


View of ITS & FMD services assembled onto the whole support chariot


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

1st patch panel for ITS & FMD

Support of 1st patch panel (fixed to the cylindrical section of the service chariot)



♦ 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 1st patch panel

TPC

TPC Service Support Wheels (SSW)


Chariot installation – step 2 (cut view on Y-Z plane)

RB26 TPC SSW

TPC

280 mm 160 mm

C3 and C4 fixation points of ITS rails



beam pipe chariot

vacuum valve with its chariot

♦ The TPC slides to the nominal position



♦ 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


Chariot installation – step 4 (cut view on Y-Z plane)

RB24 TPC SSW TPC

430 mm

320 mm



♦ 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



♦ 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


♦ The service trails are opened and fixed to the conical section of the chariot.2nd 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


Chariot installation – step 7a♦ The third support-point of the

beam pipe is fixed by means of the usual 4 wires and collar3rd 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


♦ The chariot of the beam pipe and the one of the vacuum valve are removed

Chariot installation – step 7b


♦ 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)4th problem: The stiffness of the TPC SSW has to be verified together with the TPC group


1

2

2



♦ The ITS rails are removed


PMD installation

cern, november 25, 2003 – technical board support chariot for its & fmd services on the rb24...

Documents

tpc tpc

service chariot fixation

service chariot clearance

support chariot slide

services support

fmd service trays

tpc service wheel tools

fmd services movable