Post on 17-Jan-2018
description
transcript
1G.Barber Mice Tracker Mechanical Progress 2005
Tracker Mechanical Progress
Contents:-
Station
Space Frame
Station Layout
Light Guide Map
Connectors
Patch Panel
Alignment of Tracker
QA & Assembly procedure
Conclusions
2G.Barber Mice Tracker Mechanical Progress 2005
StationsModifications to the Carbon Fibre
The New station has had its outer diametre reduced to 396 to take into account the fact that the bore of the solenoid is not machined but a rolled
tube. The connector flange has been thickened to 3mm to allow machining. This is to ensure that
there is a uniform thickness thus ensuring that the
completed tracker is ‘of one axis’ and all planes are parallel. Also the face that seats the connectors has a completely
machined face to allow all of the connectors to sit down flat thus keeping the axis of the fibres perpendicular to
the plane
3G.Barber Mice Tracker Mechanical Progress 2005
Space FrameModifications The components that are used
to construct the space frame are similar to before with the exception of the locating foot and the diametre change. The foot was changed because of problems during assembly, if the dowel location was pushed into the foot there was no way to extricate it so the new foot has 2 smaller dowels either side of the structural tube.
Old Foot Design New Foot Design
Gluing Fillet Design
4G.Barber Mice Tracker Mechanical Progress 2005
Space Frame
Tooling
The jigs that align the space frames will need to be modified/re-made
To accommodate the new foot design and also to match the new
station to station pitch.
5G.Barber Mice Tracker Mechanical Progress 2005
Station Layout/PitchThe final pitch has still to be decided but the two alternatives shown are
Top:-15cm, 18cm, 20cm and 47cm
Bottom:-15cm, 20cm, 18cm and 47cm
If this is the case the only need for a decision is to accommodate the length of wave guide and I’m sure we can accommodate a 2cm change in the lengths by making them the longest required.
6G.Barber Mice Tracker Mechanical Progress 2005
C14
C2C3
C4
C5
C6
C7
C1
C13C12
C11
C10
C9
C8
C15C17
C29C28
C27
C26
C25
C24
C30
C18
C19
C20
C21
C22
C23
C16
1To20
21To42 43
To64
65To86
87To108
109To128
129To148
149To170
171To192
215To236
193To214
621To640
599To620577
To598
555To576
533To554
513To532
493To512
471To492
449To470
405To426
427To448
299To320
277To298
257To276
237To256
321To342
343To364
365To384
385To404
22
22
22
20
22
20
22
22
20
22
22
22
22
22
20
20
22
22
20
22
22
22 22
20 20
20
22
22
20
2222
View ‘X’212 Channels
View ‘V’214 Channels
View ‘W’214 Channels
BulkheadConnector 1
BulkheadConnector 3
Bulkhead
Connector 4 Bu
lkhe
adC
onne
ctor
2
Bulkhead
Connector 5
View of the station onto the polished face of the connector
Light Guide Map
This is the final version, assuming no one finds any glaring mistakes,
of the connector map for the tracker it can be found in its full form at
http://www.hep.ph.ic.ac.uk/CAD/mice/finalmice
7G.Barber Mice Tracker Mechanical Progress 2005
Connectors
During the test beam at KEK there was a reduction in light
output from the 4th stationthis could be due to 2 or 3
different reasons. To ensure that it is not the connectors
We propose to carry out light ransmission tests thru both
station and patch panel connectors.
8G.Barber Mice Tracker Mechanical Progress 2005
Patch Panel Hole Requirements
9G.Barber Mice Tracker Mechanical Progress 2005
Positioning In The Solenoid
The tracker sits on 4 adjustablefeet two at the front two at therear and held down by a springloaded pad, all made from PTFE.This aligns the axis of tracker
and solenoid
The tracker is aligned in ZAnd Phi by pulling a locating
Block into a Vee.
10G.Barber Mice Tracker Mechanical Progress 2005
Assembly and QA for final MiceTracker
Geoff BarberPaul Kyberd
11G.Barber Mice Tracker Mechanical Progress 2005
Sequence
• Align the fibre plane onto the vac chuck assembly so that it is correctly placed for gluing to the station.
• Starting from the centre fibre, bundle the fibres into 7’s and fit into the comb• Scan the fibre plane to and ensure that it meets the requirements set down by the
QA criteria.• During the scan checks can also be made to ensure the correct bundling has been
achieved and also we should by scanning with a second camera at the back be able to ascertain the quality of the mirroring on the ‘closed’ end of the fibres.
• When happy that all is OK, take the fibres from the comb and fit the rubber sleeves and then fit them into there final positions in the connectors.
• The connectors can be fitted into a secondary bracket mounted off the vacuum chuck.
12G.Barber Mice Tracker Mechanical Progress 2005
Sequence Continued
• When all the connectors for that plane are fitted the plane can be scanned a final time to ensure that the channels are in the correct positions in the correct connector.
• When all seems well the plane still fixed to the vacuum chuck are moved across to the gluing rig and the carbon fibre station and the fibre plane are glued together.
• Once the assembly has cured the connectors can be fitted into there correct positions on the carbon fibre flange, the fibres are not yet potted but held in the connectors by masking tape so as to allow the ‘tidying up’ of the fibre runs.
• The whole process can now be repeated for the second plane although a great deal of parallel processing can haven by duplicating certain pieces of hardware.
13G.Barber Mice Tracker Mechanical Progress 2005
Comb
14G.Barber Mice Tracker Mechanical Progress 2005
Pros & Cons
Pros• This scheme will allow for almost ‘real time’ monitoring of the assembly procedure.• We will get an instant feel for the integrity of the mirroring.• It will allow us to check the middle plane and characterise it with the same accuracy
as the two outer planes.
Cons• We have not tested this out and it may prove to be a little ‘fiddly’.• We will need to make more of he existing hardware and develop a few new items.
15G.Barber Mice Tracker Mechanical Progress 2005
Conclusions
There is still a number of items to detail and a few tests to carry out. There are QA /assembly questions to be answered but overall we are in pretty good shape.