Module Assembly Update

1
Module Assembly Update

• Ohio State University and Princeton University
  are presently preparing facilities for module
  assembly.
• Both universities are fabricating parts for the
  module assembly fixtures.
• Shipping and testing boxes are presently in an
  iterative design mode to determine the best and
  most cost effective way to proceed.
• Planning for testing and quality control is in
  progress.
• Installation procedures are being coordinated by
  SLAC and Princeton engineers.
• (information in this document is
  based on 9x8 double layer tubes)

2
Shown below is a footprint of the Princeton
high bay area where tubes will be received and
tested ,after assembly the modules will be tested
and stored here. Ohio State will have a similar
facility.
3
This shows the Princeton Elementary Particles
area where modules will be assembled and put into
their testing and shipping boxes. Ohio State will
build like assembly fixtures and have a similar
set up.
4
The module assembly fixture is designed to
assemble 10 different size modules for a total of
354 modules needed. Both Princeton and Ohio State
will have 4 assembly fixtures for production. The
fixtures are designed to pivot vertical for
removal of the modules in their most rigid
orientation. Presently design is done for 9x8
double layer tubes but the fixtures can be
adapted to accommodate large single cell modules.
5
Below is a 3-D rendering of the
assembly fixtures.
6
Below is a 5 module box which will receive 5
cartridge containing first tubes from Italy and
then modules for testing and shipment.
7
Five module box with cartridge boxes inserted.
With 5 cartridgesinserted the box will weigh
approximately 300 pounds.
8
Proposed design for source scan apparatus.
Tubes and then modules will be scanned at
Princeton and Ohio State. The source is motor
driven on a 4m rail and is moved and pinned by
hand to the center of each tube.
9
View of source holder and shutter
10
The graphic below represents a study done by Vito
Casarriti on the vertical stiffness of modules.
The results show that a minimum of 5 tubes is
needed for the appropriate handling rigidity. Six
tubes per module will be the standard for better
utility routing.
11
Proposed Stiffening Rib
A stainless steel rib to be inserted
between the tubes that comprise a module will add
rigidity to the module in the horizontal
position. The module will still need to be
handled in the vertical position but the ribs
will add needed strength for installation and
operation. Holes down the center of the rib do
little to degrade the strength of the rib and it
allows flow of epoxy from one tube to the next
giving a better bond than only stainless to PVC.
12
(No Transcript)
13
(No Transcript)
14
Modules will be installed without corner
plates or center plates in place but for
replacement of a module the center plate must be
removed on the horizontal sextants and one of the
center plates must be removed on the side
sextants corner plates remain installed.
15
This table is of the barrel layer openings
provided by SLAC for RPC design. The sizes in
millimeters represent the opening minus 5mm on
each side.
16
This table is the actual production sizes of the
barrel RPCs
17
Installation fixtures that will be used for
brass installation and module installation are
being drawn up at SLAC. Brass deflection problems
are being considered at SLAC and Princeton.
Ohio State and Princeton are working on quality
control procedures for the tubes and modules at
their respective sights. SLAC will also be
implementing a quality control plan for the
modules when they arrive at on sight.