SCT Barrel 6 Support Bearing

1
SCT Barrel 6 Support Bearing
A full-scale model of the barrel 6 support
bearing has been machined at UCL (drawing
G.Barbier ) It
was tried out on both the 360 deg. End Barrel
model and the 4 Barrel assembly
model. Comments LMTs - the gaps for the LMTs
are just less than 21mm across at the narrowest
part, so tapes dont fit neatly. This part should
be shaped with the same dimensions as the end
barrel tape clamp recess. An inner surface made
of PEEK, bonded to the inner radius of
the bearing (same dimensions as end barrel LMT
clamp) would serve as an efficient strain-relief
clamp for the tapes when the bearing is screwed
down to the barrel surface. For this reason, the
bearing should be in place immediately after
harnesses are installed - if possible, otherwise
use temporary clamps.
2
Readout FIBRES - 4 sets have to be routed on the
bearing. 2 away from the horizontal interlink in
one direction and two away in the other
direction. Space is very tight - the 36 fibres
(single - sleeved) will only just fit in so it
would be preferable to have more space here. The
fibres will need to be fastened in position with
small clips - again similar to those used on the
end-barrel clamps. The bearing will have to have
screw holes for these clips. Bearing edges need a
radius where fibres pass over. HARNESS
INTERLINKS - there will have to be two
special longer interlinks at each end in the
bearing area unless they can pass underneath the
inner surface of the bearing. They would have to
be approx. 10mm longer in order to go over the
bearing screw area. THERMAL ENCLOSURE - does the
top edge of the interlink bracket clear the
thermal enclosure radius? Need drawing.
3
COOLING units - On the 360 deg model we can see
that the cooling manifold and the return are
extremely close to the bearing. Need to work out
exact clearances to make sure there is no clash
when cooing units are installed. The cooing
manifold connector position on the model is very
close to the bearing- need to check if this is
still true on the RAL drawings. ALIGNMENT - the
light path tube on the model lies directly under
the place where the bearing would be screwed
down onto the flange. Need to check if the
alignment item can be moved or the light path
shortened here. Check drawings.