g.barber/peter cooke: mechanical design update imperial 22 july 20041 mechanical update for tracker...
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1G.Barber/Peter Cooke: Mechanical Design Update Imperial 22 July 2004
Mechanical Update for Tracker workshop
Contents:-
New Station Layout
Light Guide Map
Station Connectors
Patch Panel Connectors
Progress at Liverpool
Assembly Area
Fabrication Plan
Minimum Pitch
2G.Barber/Peter Cooke: Mechanical Design Update Imperial 22 July 2004
New Station Layout
The new station layout has a total of 30 connectors, 10 per view. Each connector has 22 holes instead of the previous 18 but all of these are not used in every connector (this is shown in the light guide map).
3G.Barber/Peter Cooke: Mechanical Design Update Imperial 22 July 2004
Light Guide Map
View ‘X’ 213 Channels
View ‘W’ 213 Channels View ‘V’ 213 Channels
0-21
22-42
43-62
85-10663-84 107-128
191-212
129-150
151-170
171-190
20 20
22 22
21 20
22 22 22 22
0-21
22
22-43
44-65
66-85
22
22
19
86-104
105-126
127-148
149-170
171-192
193-212
20
22
22
22
20
22
20
2222
22
22
19
20
22
22
22
0-1920-41
42-63
64-85
86-107
108-127
128-146
147-168
169-190
191-212
4G.Barber/Peter Cooke: Mechanical Design Update Imperial 22 July 2004
Station Connectors
This is the new Station connector. The re-design will allow for easier assembly of the detector. We still need to carry out light transmission tests on this connector but cannot see any reason why it should perform less efficiently than the previous square connectors
5G.Barber/Peter Cooke: Mechanical Design Update Imperial 22 July 2004
Patch Panel Connectors
This is the 128 way patch panel connector. It is designed to maintain a vacuum in the bore of the cryostatThe 128 channels make it a match for the VLPC cassette. All the routing of the fibres takes place inside the chamber.
6G.Barber/Peter Cooke: Mechanical Design Update Imperial 22 July 2004
Patch Panel
This is the the patch panel model. It is not the definitive model as detailed drawings will be required to mate it to the magnet. This model gives space for 26 connectors, as only 25 are needed the 26th opening can be used for field monitoring services.
7G.Barber/Peter Cooke: Mechanical Design Update Imperial 22 July 2004
Progress at Liverpool
This sequence shows the station mould being produced in the Liverpool workshop
8G.Barber/Peter Cooke: Mechanical Design Update Imperial 22 July 2004
Assembly Area
The area has now been painted and the majority of the assembly equipment moved in. The lighting has been improved and we now need to re-connect the stages and the microscope. It is compared to our old assembly area, ‘quite roomy’, although non of the QA stations are set up yet.
9G.Barber/Peter Cooke: Mechanical Design Update Imperial 22 July 2004
Fabrication Plan
This is an outline of the tasks required to assemble the stations. It needs to be expanded and QA systems put in place. When all is agreed an assembly document can be compiled.
• Receive the planes from Fermilab• Inspect the planes to ensure that they have not been damaged in transit• The fibres are then grouped into ‘sevens’ and rubber sleeves fitted• The plane is then fitted onto the vacuum chuck and aligned• The vacuum chuck is transferred onto the assembly jig• The first plane is glued onto the station and allowed to cure• The second plane is then aligned on the vacuum chuck• The vacuum chuck is transferred onto the assembly jig• The second plane is glued onto the station and allowed to cure• The third plane is then aligned on the vacuum chuck• The vacuum chuck is transferred onto the assembly jig• The third plane is glued onto the station and allowed to cure
10G.Barber/Peter Cooke: Mechanical Design Update Imperial 22 July 2004
Fabrication Plan pt2
• The station will now need the connectors fitted• The centre fibre (this should be marked) is fitted in the correct
position• The fibre bunches are then fitted sequentially into the connectors • When a complete plane is ‘threaded’ the fibres are ‘tidied up’• This plane is then potted using vacuum to pull epoxy through the
holes• This procedure is repeated for the other 2 planes• When the epoxy has cured the station is taken to be diamond
polished• It should now be possible to conduct a series of tests to ascertain
its final quality
This is not exhaustive and will be added to during the coming weeks
11G.Barber/Peter Cooke: Mechanical Design Update Imperial 22 July 2004
Minimum Pitch
These two views show adjacent stations with a pitch of 100mm. It is difficult to assess the bend radius required on the fibres from this model therefore we will need to make a model using the carbon fibre stations and simulating an appropriate thickness where the fibre planes pass over the radius of the station. What the model shows is that it will be very tight