Tracker Hardware Update Aron Fish 25/01/06 Aron Fish 25/01/06.

Tracker Hardware Update

Aron Fish25/01/06

Aron Fish25/01/06

ContentsContents

Disassembly Waveguide Mapping Waveguide Check Mirroring Bulkhead Connector Alignment Hardware Equipment

Disassembly Waveguide Mapping Waveguide Check Mirroring Bulkhead Connector Alignment Hardware Equipment

Waveguide (Stays the same)

D0 End (old)

Bulkhead End(old) New Labels (for DO and Bulkhead ends)

Comments

14 9 9 9

13 4 4 4

12 D 5D 105

11 8 8 8

10 1 1 1

9 E 1E 101 Boot is loose DO end- fibres exposed

8 - 6 6

7 7 7 7

6 F2 2F 102 DO connector had no cover

5 14 14 14

4 2 - 2

3 C C 103 Boot loose - not as bad as 101

2 11 11 11

1 3 3 3

16 A A 104

15 B12 B12 12

Existing & New Labels on Waveguides

Bulkhead (external) Bulkhead (internal) Comments

105 5 Bulkhead connector screwed in but not tight

101 1 Bulkhead connector screwed in tight

102 2 Bulkhead connector screwed in tight



Disassembly continued…..

V

W

X

V1

V12

W1

W12

X1

X12

Station Connector NumberingStations A, B, C

Viewed from waveguide end

V

W

X

C10

C1

C30

C21

C20

C11

V

W

X

V1

V10

W1

W10

X1

X10

Station D (old) Station D (new version, so same format & direction as A, B & C )

UP

RIGHT

UP

RIGHT

RIGHT

UP

Station Connector Position Waveguide D0 Connector

X2,X3,X4,X5,X6,X7,X8 1 3

X9,X10,X11,X12,V1,V2,V3 4 2

V4,V5,V6,V7,V8,V9,V10 7 7

Waveguide Mapping

Station A X1, V11, V12 all unused station connectors positions


W2,W3,W4,W5,W6,W7,W8 11 8

W9,W10,W11,W12,X1,X2,X3 15 12

X4,X5,X6,X7,X8,X9,X10 2 11

X11,X12,V1,V2,V3,V4,V5 5 14

V6,V7,V8,V9,V10,V11,V12 8 6

Waveguide Mapping

Station B W1 is the only unused station connector position


W3,W4,W5,W6,W7,W8,W9 10 1

W10,W11,W12,X1,X2,X3,X4 13 4

X5,X6,X7,X8,X9,X10,X11 14 9

Waveguide Mapping

Station C W1, W2, X12 all unused station connectors positions


W1,W2,W3,W4,W5,W6 12 105

W7,W8,W9,W10,X1,X2 16 104

X3,X4,X5,X6,X7,X8 3 103

X9,X10,V1,V2,V3,V4 6 102

V5,V6,V7,V8,V9,V10 9 101

Waveguide Mapping

Station D

Waveguide Mapping Contin….

Waveguide Mapping Contin….

By injecting light using the filtered LED, I have also checked the light output from the D0 --> bulkhead --> station connector.

The dead channels have been noted and the mapping information from this has also been noted. This will be put together with my other mapping information to produce a final (correct) version of the fibre and waveguide mapping.

Also, there was no light loss notable by eye. This will need to be checked again quantitively, once the CCD camera set-up arrives.

By injecting light using the filtered LED, I have also checked the light output from the D0 --> bulkhead --> station connector.

The dead channels have been noted and the mapping information from this has also been noted. This will be put together with my other mapping information to produce a final (correct) version of the fibre and waveguide mapping.

Also, there was no light loss notable by eye. This will need to be checked again quantitively, once the CCD camera set-up arrives.

MirroringMirroring

For a first look at the mirroring on the 4th station, we used a red LED to illuminate the scintillating fibres at the station connectors.

We found that light was coming through the mirrored ends, but not for all the fibres, I’d say roughly a 1/3 of them (which Roger had predicted) and from what I can remember, Malcolm and Hideyuki’s results show a uniform 30% loss over the 4th station.

Paul Kyberd also saw a similar amount of loss for the 3 old stations, which indicates that the mirroring isn’t solely causing the 30% loss of photons, but again this was only a first look by eye, so could be misleading.

We found that light across the planes was delineated by light being scattered out? (See picture on other .ppt.)

Also, we found more loss of light near the sharp edge of the station carbon fibre body. Geoff believes this could be from optical contact with the glue.

For a first look at the mirroring on the 4th station, we used a red LED to illuminate the scintillating fibres at the station connectors.

We found that light was coming through the mirrored ends, but not for all the fibres, I’d say roughly a 1/3 of them (which Roger had predicted) and from what I can remember, Malcolm and Hideyuki’s results show a uniform 30% loss over the 4th station.

Paul Kyberd also saw a similar amount of loss for the 3 old stations, which indicates that the mirroring isn’t solely causing the 30% loss of photons, but again this was only a first look by eye, so could be misleading.

We found that light across the planes was delineated by light being scattered out? (See picture on other .ppt.)

Also, we found more loss of light near the sharp edge of the station carbon fibre body. Geoff believes this could be from optical contact with the glue.

Also whilst checking the mapping of the waveguides I came across one of the drilled holes in the bulkhead connector offset by a reasonably large amount.

This leads me to the question could the dowels for example on the bulkhead connectors (only used on 4th station) be slightly misaligned, leading to an offset of a roughly a few hundred microns? I.e. 30%? Could be a stupid question, as I’m sure it was measured precisely when the holes were drilled, but it might be worth reassessing, if possible?

Also whilst checking the mapping of the waveguides I came across one of the drilled holes in the bulkhead connector offset by a reasonably large amount.

This leads me to the question could the dowels for example on the bulkhead connectors (only used on 4th station) be slightly misaligned, leading to an offset of a roughly a few hundred microns? I.e. 30%? Could be a stupid question, as I’m sure it was measured precisely when the holes were drilled, but it might be worth reassessing, if possible?

Again, sorry for bad picture but you can still clearly see the offset

Paul Kyberd has suggested when the camera arrives “we make a holder for the UV laser with a collimation hole at the front to allow a controllable amount of light through and that we hold this against the plane (or very close to), this solves the problem of imaging the light, which we need to do for the QA, but not for this measurement. Then we can take the camera and hold it up against the output of the fibres and make an integrated measurement, which again removes the need to worry about focus. It may be we need to do proper focusing to get a good enough measurement, but we should be able to do a good first look”.

Geoff is currently designing a way of doing this, while Roger has already built a stand so that we can test each station carefully and without the station frame intact, so we have more room for maneuver.

Paul Kyberd has suggested when the camera arrives “we make a holder for the UV laser with a collimation hole at the front to allow a controllable amount of light through and that we hold this against the plane (or very close to), this solves the problem of imaging the light, which we need to do for the QA, but not for this measurement. Then we can take the camera and hold it up against the output of the fibres and make an integrated measurement, which again removes the need to worry about focus. It may be we need to do proper focusing to get a good enough measurement, but we should be able to do a good first look”.

Geoff is currently designing a way of doing this, while Roger has already built a stand so that we can test each station carefully and without the station frame intact, so we have more room for maneuver.

Next Step….

Hardware equipmentHardware equipment CCD Cameras now ordered, expected at

Imperial on Friday (27th Jan), worst case Monday (30th Jan).

Lenses ordered, 1-2 weeks expected for delivery, work on light loss can start without these, so least important.

Video capture card ordered and expected to arrive sometime early next week (31st Jan or 1st Feb).

Bill Cameron is currently organizing a PC for me to set-up in the tracker room at Imperial.

CCD Cameras now ordered, expected at Imperial on Friday (27th Jan), worst case Monday (30th Jan).

Lenses ordered, 1-2 weeks expected for delivery, work on light loss can start without these, so least important.

Video capture card ordered and expected to arrive sometime early next week (31st Jan or 1st Feb).

Bill Cameron is currently organizing a PC for me to set-up in the tracker room at Imperial.

Tracker Hardware Update Aron Fish 25/01/06 Aron Fish 25/01/06.

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Transcript of Tracker Hardware Update Aron Fish 25/01/06 Aron Fish 25/01/06.