Basic Outline of the RAL Barrel Module Hybrid Mounting Hardware
The outline was to design a hybrid mounting system which allowed non-dedicated
staff to fit any hybrid onto a 4-detector sub assembly. It had to be usable
by those wearing glasses, and require a minimum of setting up. It had to
be expandable to allow construction of more than 2 modules a day. If possible
it had to contain items that might transfer to other operations such as
wire bonding. Its major action is to allow alignment of the hybrid in XY
and Z relative to the previously aligned detectors.
We have purchased some custom optics which should allow us to see the
hybrid and detector within a single field of view.
The main point to understand in the mounting of a hybrid is that the
action is to wrap the 4-detector sub assembly around the hybrid, rather
than the inverse. A short animated film viewable with MediaPlayer
or similar is viewable here.
Brief Description of Hardware
The optics is supported on a cantilever arm over a pair of rails which
are aligned left right relative to the operator. The 4 detector sub assembly
is mounted into a carrier which is equipped with 2 cover plates (one each
side). A baseplate which is fitted with a manual XYZ stage to which the
hybrid pickup plate is fitted. The carrier is in turn clipped onto the
baseplate which slides on the two rails. It is hinged so that it may be
rotated on the baseplate to give access to ether side of the module.
Assume the hybrid is in a carrier component side up.
Fit the baseplate onto the rails.
Load the hybrid onto its pick up jig on the baseplate using a mixture of
vacuum to get Z and pins that fit down the 4 holes (two in each hybrid)
to give XY control.
Load the 4-detector sub assembly into its carrier and fit the covers.
Slide the baseplate from under the optics rotate it around one of the rails
and clip the carrier onto the baseplate. (The carrier rotates on the baseplate
along the fold line of the hybrid).
Slide the baseplate with both the hybrid and 4 detector sub-assembly under
Pre-align the hybrid relative to the detectors using the standard linear
motion stages mounted on the baseplate.
Slide this assembly from under the optics. Rotate the baseplate around
the rails to give access to the underneath of the module and hybrid.
Rotate the carrier to give access to the top hybrid.
Apply the adhesive to the feet of the top hybrid
Rotate the carrier back to its original position
Return under the optics for final alignment.
Remove and put aside to cure.
For second side of the hybrid, remount the baseplate.
Turn off the vacuum to the topside hybrid.
Rotate the carrier the module around the bottom hybrid.
Align as before.
Remove and set aside to cure.
Fit the covers (blue in the video) and remove the carrier.
Drawings are complete apart from detail of item to hold hybrid as we are
awaiting an engineering drawing. A prototype item is being constructed
now in anticipation of the first batch of KEK hybrids.
Last update: 17.08.00
Contact Martin Gibson