Progress On The Design Of The Full Tracker Contents:- Recap of New Station Layout Version 2.5 Version 3 (Final) Station Connectors Patch Panel Connectors Progress at Liverpool Assembly Area Alignment.
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Progress On The Design Of The Full Tracker
Contents: Recap of New Station Layout Version 2.5
Version 3 (Final) Station Connectors Patch Panel Connectors Progress at Liverpool Assembly Area Alignment Ideas Summary G. Barber Sci-Fi Tracker Progress Ral 28 Oct 2004 1
New Station Layout (recap)
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 later in the light guide map).
G. Barber Sci-Fi Tracker Progress Ral 28 Oct 2004 2
Light Guide Map
64-85
22
86-107
22 20
108-127 42-63
22
20-41
22 20
0-19 193-212
20
171-192
22 22
149-170
22
127-148
22
105-126 86-104
19 19
128-146
22
147-168
22
169-190
22
191-212 0-21
22 View ‘W’ 213 Channels
22-42
21
43-62
20 View ‘V’ 213 Channels
66-85
20 View ‘X’ 213 Channels
63-84
22
85-106
22
107-128
22
129-150
22
151-170
20
171-190
20
191-212
22
0-21
22
44-65 22-43
22 22 G. Barber Sci-Fi Tracker Progress Ral 28 Oct 2004 3
Version 2.5
This is the version that is being considered if there is initially only one solenoid. It will consist of two trackers as shown, back to back with an absorber in between set inside one solenoid.
G. Barber Sci-Fi Tracker Progress Ral 28 Oct 2004 4
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 G. Barber Sci-Fi Tracker Progress Ral 28 Oct 2004 5
Version 3 (Final)
This will be the final version to be installed inside two solenoids. It will consist of two trackers as shown each consisting of 5 stations. The definitive station pitch has yet to be decided but this will only effect the space frames and the internal light guide length.
G. Barber Sci-Fi Tracker Progress Ral 28 Oct 2004 6
Station Connectors
The new Station connectors are being made at Imperial College. These are to be used in the construction of the fourth station which is to be used at the test beam in Japan. We have asked for a price for the manufacture of enough connectors to complete the full tracker assemblies.
(£13.25 + mat’l. per set) G. Barber Sci-Fi Tracker Progress Ral 28 Oct 2004 7
Patch Panel Connectors
This is the 128 way patch panel connector. It is designed to maintain a vacuum in the bore of the cryostat The 128 channels make it a match for the VLPC cassette. All the routing of the fibres takes place inside the chamber.
G. Barber Sci-Fi Tracker Progress Ral 28 Oct 2004 8
Progress at Liverpool
This sequence shows the station mould being produced in the Liverpool workshop.
There has since been a second mould made and a new ‘improved’ station produced G. Barber Sci-Fi Tracker Progress Ral 28 Oct 2004 9
Assembly Area
The area has now been refurbished. It now has air conditioning and the lighting level (no UV) has been raised. The linear stages and optical systems are in place and operational. We have installed enough storage to accommodate all of the components required to build the full trackers. The bottom picture shows an area for QA tests currently being developed at Brunel.
G. Barber Sci-Fi Tracker Progress Ral 28 Oct 2004 10
Assembly Equipment
Most of the assembly equipment will remain the same as used on the first prototype although with a few improvements. The station holder has had to be re-made as the station profile has changed this gave us the opportunity to change the bearing system to improve ease of use and the alignment method between holder and station to speed up the fitting.
G. Barber Sci-Fi Tracker Progress Ral 28 Oct 2004 11
Alignment/Stability
To develop a stable system we plan to carry out a series of assembly tests. To allow us to determine the position of each station we will be fitting 3 ruby spheres to each station, these can then be measured on our CMM. This will allow us to not only check the stability of the structure but will also allow us to know the positional repeatability we can expect from the locating system. G. Barber Sci-Fi Tracker Progress Ral 28 Oct 2004 12
Summary
• We are now ready to build the 4
th station and this will allow one more round of ‘fine tuning’.
• The design of the final layout be it 2.5 or final
needs to start now and this will involve not only the tracker but all of its neighbours.
• It will be necessary to run a series of tests on
the final structure to assess its stability
• Busy times ahead G. Barber Sci-Fi Tracker Progress Ral 28 Oct 2004 13