SVD Mechanics 21th B2GM Florian Buchsteiner (HEPHY Vienna) 2015-06-22.
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Transcript of SVD Mechanics 21th B2GM Florian Buchsteiner (HEPHY Vienna) 2015-06-22.
Florian Buchsteiner (HEPHY Vienna)
SVD Mechanics
21th B2GM 2015-06-22
Florian Buchsteiner (HEPHY Vienna)
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
Florian Buchsteiner (HEPHY Vienna)
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.
2015-06-22 3
Florian Buchsteiner (HEPHY Vienna)
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
2015-06-22 4
Florian Buchsteiner (HEPHY Vienna)
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
2015-06-22 5
Florian Buchsteiner (HEPHY Vienna)
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)
2015-06-22 6
Florian Buchsteiner (HEPHY Vienna)
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
2015-06-22 7
Florian Buchsteiner (HEPHY Vienna)
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
2015-06-22 8
Florian Buchsteiner (HEPHY Vienna)
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
Florian Buchsteiner (HEPHY Vienna)
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
2015-06-22
Holes for air exchange (filling dry air)
10
Florian Buchsteiner (HEPHY Vienna)
Transport Box During EQA
• Removable BWD/FWD cover for EQA test
2015-06-22
Bottom cover
11
Florian Buchsteiner (HEPHY Vienna)
Transport Box Visual Inspection (Top)
• Removable top cover for visual inspection
2015-06-22 12
Florian Buchsteiner (HEPHY Vienna)
Openings At The Bottom For Source Test
• Removable bottom cover for source test
2015-06-22
Openings for source test(green lines show the way of the source test)
13
Florian Buchsteiner (HEPHY Vienna)
Final Source Test With Full Ladder
• @ HEPHY we use our test box with an X/Z stage
2015-06-22
Particles beam (symbolic)
14
Florian Buchsteiner (HEPHY Vienna)
Transport Box Lift System & Positioning 1/2
• Necessary for the Pisa ladder assembly (support under the end mounts)
2015-06-22
Linear bush (8mm)
Linear bush (6mm)
Precision pin (8mm)
Precision pin (6mm)
Ground plate for transport box
15
Florian Buchsteiner (HEPHY Vienna)
Removing the Set Screws Before Lifting
• M3 plastic set screws have to be removed before lifting the ladder
2015-06-22
M3 plastic set screw (secured with Loctite 222 – 6Nm)
16
Florian Buchsteiner (HEPHY Vienna)
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)
2015-06-22 17
Florian Buchsteiner (HEPHY Vienna)
L5 Origami Source Test
182015-06-22
Source holder
Florian Buchsteiner (HEPHY Vienna)
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)
192015-06-22
Florian Buchsteiner (HEPHY Vienna)
Barrel Cross Section
202015-06-22
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
Florian Buchsteiner (HEPHY Vienna) 222015-06-22
6
7 8
2.59 mm
2.74 mm4.27 mm
5
1.88 mm
Florian Buchsteiner (HEPHY Vienna)
Barrel at L6 Knee
232015-06-22
1
2
Same occurrences on the other half (L4, L5, L6 are symmetric)
Florian Buchsteiner (HEPHY Vienna) 242015-06-22
1 2
0.93 mm
Not an issue (looks like one only in 2D projection)
0.33 mm
0.46 mm
Florian Buchsteiner (HEPHY Vienna)
Forward Cross Section
252015-06-22
1
2
Same occurrences on the other half (L4, L5, L6 are symmetric)
Florian Buchsteiner (HEPHY Vienna) 262015-06-22
1 2
1.13 mm
0.33 mm
0.46 mm
0.97 mm
Florian Buchsteiner (HEPHY Vienna)
Backward Cross Section
272015-06-22
3
1 & 2
1 & 2 occur between all L4 ladders
Florian Buchsteiner (HEPHY Vienna) 282015-06-22
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
2015-06-22
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
Florian Buchsteiner (HEPHY Vienna)
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?
312015-06-22
Florian Buchsteiner (HEPHY Vienna)
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
2015-06-22 32
Florian Buchsteiner (HEPHY Vienna)
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
2015-06-22 33