G.Barber Mice Tracker Mechanical Progress Imperial 2006 1 Tracker Update Contents:- Components Station Layout Light Guide Map QA Patch Panel Alignment

1G.Barber Mice Tracker Mechanical Progress Imperial 2006

Tracker Update

Contents:-

Components

Station Layout

Light Guide Map

QA

Patch Panel

Alignment of Tracker

Installation Procedure

3D Virtual Model

Conclusions


StationsModifications to the Carbon Fibre

The New station has had its outer diameter 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


Station 4 Fabrication (Finished)


Space Frame

Modifications The components that are used

to construct the space frame are similar to before with the exception of the locating foot and the diameter 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. 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.

This has been identified as a work package that

can be given out to contract people and will

be investigated


Station Layout/Pitch

The final pitch has still to be decided but the two alternatives shown are

Top:-15cm, 23cm, 25cm and 47cm

Bottom:-15cm, 25cm, 23cm 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.

Still to be decided


C14

C2C3

C4

C5

C6

C7

C1

C13

C12

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

22

22

View ‘X’212 Channels

View ‘V’214 Channels

View ‘W’214 Channels

Bulkhead

Connector 1

BulkheadConnector 3

Bulkhead

Connector 4 B

ulkh

ead

Con

nect

or 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


Connector 1

View ‘W’

20 Way

Bundles1 – 20

To Bulkhead Connectors1, 6, 11, 16 & 21

1

5 3

7

4

6

2

8910

11

13 12141516

18 17

x x

20 19Station connectorViewed from thepolished face.Internal light guideconnector viewedfrom rear or fibre entry side.


Internal Lightguides Station 1

C1 1 to 20

C2 21 to 42

C3 43 to 64

C4 65 to 86

C5 87 to 108

C6 109 to 128

C7 129 to 148

C8 149 to 170

C9 171 to 192

C10 193 to 214

C11 215 to 236

C12 237 to 256

C13 257 to 276

C14 277 to 298

C15 299 to 320

C16 321 to 342

C17 343 to 364

C18 365 to 384

Bulkhead 1

1 to 128

Bulkhead 3

257 to 384

Bulkhead 2

129 to 256

Length = XXXmm

Length = XXXmm

Length = XXXmm


External Lightguides

• These are one to one connections between the external tracker bulkhead connector and the VLPC 128 way connectors.

Bulkheadconnector

VLPCconnector


QA

Due to the problem that has been highlighted by the connectors, more thought is required for the QA. One of the things we will be doing is to manufacture a ‘GO gauge’. This would be a block of very accurately positioned pins that match the hole pattern on the connector. If the connector and the block fit together then the holes in the connector are acceptable, if not it is discarded. Such a gauge could be given to the manufacturer so as to ensure consistent quality.


Assembly Comb

This is being manufactured in Liverpool from aluminium and will be tried with the existing

fibre ribbon (at Brunel).


Patch Panel Hole Requirements

Detail Drawing a

lmost

complete


Positioning In The Solenoid

The tracker sits on 4 adjustablefeet two at the front two at the

rear and is held down by a springloaded foot at the 12 o’clock position. This aligns the axis of both tracker and solenoid

The tracker is aligned in Zand Phi by pulling a locating

block into a Vee which is located using dowels to

the patch panel.


The Diffuser In The Solenoid

The new device to hold andchange the lead diffuser

in the solenoid will be partially mounted onto the cover of the

patch panel. The cover will need to be stiffened and tied back to the ‘solid’ region where the

patch panel is mounted to the solenoid. We have allowed

a bore of 331Ø in the cover with a series of holes and a position for an O-ring.

The final details to be worked out with Wing & Stephanie


Installation ‘Cartoon’

The following sequence is a first attempt to show the stages of installation of the tracker into the solenoid. They are not definitive and are aimed to provoke a debate/discussion. I hope that the installation will then evolve with all interested parties contributing. It should be noted that all of this work will need to take place in a ‘light controlled’ environment (NO UV).


Stage 1 of Installation

The patch panel is fitted and sealed to the solenoid. Hopefully at this stage we can test the seals using cover plates.



A target module is fitted into the bore of the solenoid and the feet adjusted to set the cross hairs on the same axis as the solenoid bore. Then the Phi/Z retaining bracket is fitted and the whole assembly surveyed it is carefully removed to the CMM for measurement. (As Mike pointed out, this makes a good ‘Go Gauge).



The target module is mounted onto the CMM(Computerised Measuring Machine), in a jig that simulates the bore of the solenoid. It is then surveyed.



The tracker module is then mounted into the same jig on the CMM. Using the survey from the target module we can adjust the 4 support feet until the tracker shares the same axis as the target module.



The tracker, complete with the light guide support structure is lifted onto the installation cradle. The light guide support structure is to ensure that no damaging forces are exerted on the fibres. Covers will be fitted during transit.



The tracker is then slide into its pre-determined position inside the bore of the solenoid. This position will already have been determined using the ‘tracker target’ in stage 2.


Recap of Positioning In The Solenoid

The tracker sits on 4 adjustablefeet two at the front two at the

rear and is held down by a springloaded foot at the 12 o’clock position. This aligns the axis of both tracker and solenoid

The tracker is aligned in Zand Phi by pulling a locating

block into a Vee which is located using dowels to

the patch panel.



With the tracker in position and secure the light guides can now be carefully re-routed to their final position in the patch panel and the seals fitted. If the external light guides are not to be attached immediately then light tight/protection covers will remain fitted.



The light guides can then be secured to stop any damage and a shield (not shown) fitted to stop any damage occurring when the diffuser is installed. The Light guide support structure is now removed.



The patch panel cover is fitted and sealed to the patch panel. If we are not ready to fit the diffuser mechanism then a cover plate will be attached. We can repeat the gas seal test at this point.


Requirements (those thought of at least)

To carry out the work we will need at least 2M of clear working area in front of the solenoid. We hope that this is achievable either by removing equipment in front of the solenoid or as is more likely, by moving the solenoid sideways out of the beamline. The solenoid and its kit would sit on a plinth and it would move as one. As already stated we will need this area to be light controlled, this will probably be achieved by building a tent structure over the area.


Overall Layout (Land Grab)

Because of the amount of equipment required to fit into the area and possible conflicts that this may cause it has been decided to ‘build’ a 3D virtual model of the region. Also we need to be sure that all of our fibres can be accommodated in the fibre length allowed so this model will be the first step in this process. We plan to eventually build a full size model of this region to convince ourselves that what we have designed is feasible. The patch panel, fibre run, trellis and VLPC unit have been modelled and the idea is (we hope) to ask Stephanie to ‘assemble’ all of the 3D modelled items into a master model based on Tony’s floor layout.


Layout 1st Attempt


Layout 2nd Attempt

This was an attempt to achieve a shorter fibre run. In actual fact it increased

the longest run from 1884mm to over 2200mm


Conclusions

• We have the design completed but for a few details and require a final set of engineering drawings.

• There is more work to be carried out on the layout and we hope to build a physical model to help.

Documents

G.Barber Mice Tracker Mechanical Progress Imperial 2006 1 Tracker Update Contents:- Components Station Layout Light Guide Map QA Patch Panel Alignment