g.barber mice tracker mechanical progress 2005 1 tracker mechanical progress contents:- station...

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


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


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


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.


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.


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


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.


Patch Panel Hole Requirements


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.


Assembly and QA for final MiceTracker

Geoff BarberPaul Kyberd


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.


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.


Comb


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.


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.

g.barber mice tracker mechanical progress 2005 1 tracker mechanical progress contents:- station...

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