Support chariot for ITS

1
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
2
Y-Z plane cut-view of the ITSFMD services and of
their support chariots
Cylindrical section of the service chariot
Conical section of the service chariot
Fixation between conical and cylindrical sections
of the service chariot
Clearance between the TPC and the service chariot
1st patch panel for ITS FMD
Fixation of the service chariot to the TPC
service wheel
TPC cone
Support of 1st patch panel (fixed to the
cylindrical section of the service chariot)
2nd patch panel
PMD
Maximum radius of ITS services support to allow
for TPC sliding-in
Temporary cylindrical support of the movable
section of the services
ITS rails
beam axis
Int. Point
3
Interferences with the PMD

• 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
4
Axonometric view of the service trays (upper half
chariot)
2 lowered cable trays to allow the TPC sliding-in
(room for the tools used for hanging ITS to the
TPC)
Fixed cylindrical section of the ITS FMD
services
TPC
1 out of 11 cable trays per quadrant
ITS
Hinges of the cable trays 1st problem they
require flexible pipes (plastic or metal bellows)
and prevent tight fastening of cables

• Movable section of the ITS FMD service trays
• cylindrical during TPC sliding-in
• conical when TPC is on Int. Point

5
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)
Tool to lift the whole chariot in cantilever mode
by pushing onto the TPC service wheel
Cylindrical section of the service chariot with
its wheels
Conical section of the service chariot with its
wheels
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.
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
6
View of ITS FMD services assembled onto the
whole support chariot
7
Chariot installation step 1
1st patch panel for ITS FMD

• 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

Support of 1st patch panel (fixed to the
cylindrical section of the service chariot)
8
Chariot installation step 2
TPC Service Support Wheels (SSW)
TPC

• 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

9
Chariot installation step 2 (cut view on Y-Z
plane)
TPC
RB26 TPC SSW
280 mm
160 mm
C3 and C4 fixation points of ITS rails
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Chariot installation step 3

• The TPC slides to the nominal position

beam pipe chariot
vacuum valve with its chariot
11
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

12
Chariot installation step 4 (cut view on Y-Z
plane)
RB24 TPC SSW
TPC
430 mm
320 mm
13
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

14
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

15
Chariot installation step 6 - problem

• 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.

C4
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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

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Chariot installation step 7b

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

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Chariot installation step 8

• 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

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Chariot installation step 9

• The ITS rails are removed

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PMD installation