svd mechanics 21th b2gm florian buchsteiner (hephy vienna) 2015-06-22

Florian Buchsteiner (HEPHY Vienna)

SVD Mechanics

21th B2GM 2015-06-22


Overview

• Changes in the Rev. 2.4– Isolation for the cooling pipes– Adapted cooling pipes routing for isolation on end flange– FWD L4 end mount modification– Chamfer for the fiber and cooling pipe clamp– Narrower Keratherm between hybrid board and end

mount/APV guard– New 3mm holes in the end rings BWD/FWD-L4/3 for NTC

• L5 ladder transport container • L5 Origami source test• Mechanics requirements for ladder assembly

2015-06-22 2

Markus Friedl

Diese Löcher sind eigentlich schon wieder Geschichte. Nachdem sie aber in 2.4 drin sind, füge hinzu "(not implemented)" oder so ähnlich. In 2.5 solltest du die wieder entfernen, um die Realität abzubilden


Isolation For The Cooling Pipes

• The DESY group will try to produce the isolators (decision @ the last VXD mechanics meeting @ DESY) for the VXD and this is the new design by Karsten G.

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Markus Friedl

War das nicht das vorletzte (da, wo ich auch dabei war)? Besser Datum (zumindest Monat) dazuschreiben


Adapted Cooling Pipes Routing For Isolation On End Flange

• The connection between the cooling pipes (end ring and Origami) was adapted to the new isolators

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FWD L4 end mount modification

• @ the last DESY mechanics meeting we saw on the thermal mockup that the gap between FWD end mount and FWD L3 end ring is maybe not enough and so we made the decision that we modify the FWD L4 end mount (1 milling step)

Gap with old design

Gap with new design

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Markus Friedl

Auch hier wieder (wie S.3)


Chamfer For The Fiber And Cooling Pipe Clamp

• We have a lot of tolerance at the H-shapes (gluing gaps) and so we need more clearance between the L6 clamps and outer shell (now more than 2mm gap)

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Keratherm Hybrid Board

• The Keratherm (red) at the APV (brown) on the hybrid board changed from 5.6mm width to 4mm because the APV guard squeezes the Keratherm

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New 3mm Holes In The End Rings BWD/FWD-L4/3 For NTC

• Lorenzo wants to have two NTCs on each end ring for redundancy• For the end rings L6/L5 we can use the holes that were used during

the production • No conflict with the cooling channel inside (3mm deep)

Gluing NTC

Gluing NTC

BWD L4/L3 end ring FWD L4/L3 end ring

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Markus Friedl

Updaten: Toru decided not to implement those holes (too risky)NTCs will be attachedto L4/3 end rings by gluing


L5 Ladder Transport Container

2015-06-22

• Material is 8mm thick aluminum except the BWD/FWD cover (3mm thick)

• Material costs:– Linear bushes ~10€ (1300¥)– Aluminum ~37€ (4810¥)– Screws ~1.5€ (195¥)

BWD cover

FWD cover

Bottom cover

Top cover

Side wall

9

Markus Friedl

Acrylic glass (geht das im Rendering transparent inklusive L5-Ladder drin?)


Holes For Air Exchange

• The container comes in a plastic bag and this plastic bag will filled with dry air

• The holes (BWD&FWD) are expected to ensure that dry air comes in the container

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Holes for air exchange (filling dry air)

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Transport Box During EQA

• Removable BWD/FWD cover for EQA test

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Bottom cover

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Transport Box Visual Inspection (Top)

• Removable top cover for visual inspection

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Markus Friedl

Hier besser Foto -> Galleryhttp://gallery.hephy.at/v/electronics/mechanics/l5container/


Openings At The Bottom For Source Test

• Removable bottom cover for source test

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Openings for source test(green lines show the way of the source test)

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Final Source Test With Full Ladder

• @ HEPHY we use our test box with an X/Z stage

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Particles beam (symbolic)

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Transport Box Lift System & Positioning 1/2

• Necessary for the Pisa ladder assembly (support under the end mounts)

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Linear bush (8mm)

Linear bush (6mm)

Precision pin (8mm)

Precision pin (6mm)

Ground plate for transport box

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Removing the Set Screws Before Lifting

• M3 plastic set screws have to be removed before lifting the ladder

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M3 plastic set screw (secured with Loctite 222 – 6Nm)

16

Markus Friedl

Das sind jetzt Inbus-Plastik-Schrauben (damit der Stefan nicht wieder abrutscht).English: hexagon socket plastic set screws


Transport Box Lift System & Positioning 2/2

• 3mm gap between end mounts and support structure• Allows pickup with fork lift (Filippo's ladder mounting system)

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L5 Origami Source Test

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Source holder

Markus Friedl

Das ist eigentlich


Distance Between Ladders

• (Not really) collision analysis: looking at various spots where neighboring objects are close to each other

• Generally: 1mm minimum gap (with exceptions)

• Some cases look like a problem (in a 2D projection) but in fact aren’t (when looking at different angle in 3D model)

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Barrel Cross Section

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1

5

3

4

2

6

Symmetry:Same occurrences in left and right halves

7

8

Proximity issues (all between L4 and L5)

DSSD distance of neighboring ladders

Florian Buchsteiner (HEPHY Vienna) 212015-06-22

1

3 4

0.33 mm

0.84 mm 1.32 mm

0.46 mm

2


6

7 8

2.59 mm

2.74 mm4.27 mm

5

1.88 mm


Barrel at L6 Knee

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1

2

Same occurrences on the other half (L4, L5, L6 are symmetric)


1 2

0.93 mm

Not an issue (looks like one only in 2D projection)

0.33 mm

0.46 mm


Forward Cross Section

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1

2

Same occurrences on the other half (L4, L5, L6 are symmetric)


1 2

1.13 mm

0.33 mm

0.46 mm

0.97 mm


Backward Cross Section

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3

1 & 2

1 & 2 occur between all L4 ladders


1 2

3

1.13 mm

0.63 mm

1.26 mm Not an issue (looks like one only in 2D projection)

Better to make the clamp a bit narrower (to achieve at

least 1mm gap)

29Florian Buchsteiner (HEPHY Vienna)

BWD L4 Connectors

• That’s why we need to connect the BWD L4 cables before mounting the ladder (similar to the L3 case)

2015-06-22

0.95 mm

30Florian Buchsteiner (HEPHY Vienna)

Comparison CAD – Reality

• Measured on L5.902 (class C)– 2 PA1 & 2 PA2, each measured on both sides– Good match of average and CAD

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CAD = 3.73 mmReality:Min = 3.25 mmAvg = 3.74 mmMax = 4.10 mm

CAD = 2.25 mmReality:Min = 2.06 mmAvg = 2.28 mmMax = 2.56 mm


Distance Between Ladders – Assessment

• Gap between adjacent DSSD sufficiently large to allow some sagging without collision– 1.88mm (L3) to 4.27mm (L6)

• Generally 1mm minimum gap except for cases mostly between L4 and L5 (and L5 to L6) with PA1/2 loop (flexible)

• Average PA1/2 bend in CAD matches well with reality, but 0.5mm tolerance in height (~0.3 length)

• Tolerances may lead to PA1/2 touching adjacent rib– No Ohmic issue because of PA coverlay– Maybe noise issue? (Capacitive coupling)– Maybe add Kapton tape around bottom of L5 & L6 ribs?

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Summary

• New isolation design by Karsten G.• Cooling pipes routing adapted to new isolators• L4 end mount modification for more clearance• Fiber and cooling pipe clamps modification for more

clearance between the L6 clamps and the outer shell• BWD&FWD L4/L3 end rings need a 3mm holes for

the NTC’s• L5 ladder transport container • L5 Origami source test is designed• Mechanics requirements for ladder assembly is done

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Outlook

• Mechanical ladder tests @ Pisa/HEPHY (L5 Class-C)

– Vibration test (Pisa)

– Deformation test (Pisa)

– Intensive thermal cycling test (Pisa?/HEPHY done)

• Redesign of SVD dock box• July/August L6 Origami cooling pipe bending and

pressure test @ MPI + cable mockup

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svd mechanics 21th b2gm florian buchsteiner (hephy vienna) 2015-06-22

Documents

fwd end mount

cooling pipes end ring

end rings l6l5

end rings bwdfwdl43

end flangethe connection

end mountapv guardnew

attachedto l43 end rings

fwd l3 end ring