LST Module Installation

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LST Module Installation

• Mechanical Design Review

William Sands, Princeton University, 10-22-03
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Installation Procedure Overview

• 1) Installation takes place
  from the forward end using positioning apparatus
  designed for RPC removal.
• 2) The Z-strip is installed first with
  connectors toward the backward end.
• 3) Module is installed HV end toward
  backward end with utility tray fastened.
• 4) HV and gas lines are installed to
  module.
• 5) Next module installed and gas lines
  daisy chained from first module and HV plug
  installed.
• 6) When enough modules are in place so
  that the last will protrude from the backward
  corner plate the modules can be slide behind the
  corner plate.
• 7) Procedure continues until layer is
  full.

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Z-Strips
The Z-Strips are placed in each layer prior to
the modules. The readout connectors are
positioned between the center gap plates on the
four side sextants and straddle the center gap
plate on the top and bottom sextants.
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Utility Trays

• The utility trays are installed on the
  module prior to sliding the module into a layer.
  The trays are used to organize the routing of
  cables and gas lines out of the layers.

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Module Installation

• The modules will be installed by
  positioning the H-Box on the RPC removal
  apparatus and sliding the modules into the
  appropriate layers. When the modules are
  installed from one side of the box the top can be
  replaced and the box flipped to access the other
  side.

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Forward End Facing North
The forward end where the Z-strips and modules
are installed will have the corner plates and
center gap plates removed. Full access to the
layers in the forward end will allow for a much
more controlled installation and is necessary to
fit the Z-strips which are full width.
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Forward End Facing East
For installation of the bottom sextant we have
some obstructions with the concrete pier and
structural apparatus shown below. The pier is
approximately 161 from the steel and points on
the structure come as close as 60. Installation
can be accomplished by installing some modules on
an angle and then sliding them over.
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Backward End Facing South
From the backward end the gas lines , Z-Strip
readout and HV lines will exit the layers between
the gap plates. The gap plates will be removed
for installation except in the bottom sextant
where the DIRC prevents removal. The Phi readout
will exit through the forward end except in layer
18 where all utilities must be routed through the
forward end where there is no access to the
backward end.
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Cable Routing
Cables and gas lines will be routed toward the
opening at the center gap plates in the utility
trays as shown below. Gas lines will be connected
from one module to the next as they are slide to
the corners, work will be done from the corners
to the center where the bundles will enter a
conduit to rout to the electronics and gas huts.
Layer 17 and 18 contain 10 modules each which
have the most utilities from each sextant to be
routed. In the trays 5 modules will be routed
from each side containing an input and output gas
line and 5 HV lines along with grounds.
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Daily Plan

• Each day in two shifts the plan is to
  install one layer or more if possible. A third
  quality control shift then comes on tests the
  modules each day. If a problem is found the first
  task the next day is to replace the faulty module
  and then move on to the next installations.
• It has been found that tube can sometimes
  be repaired, if this is the case the module will
  be used as a spare or installed in another
  sextant at a later date.