SVD Mechanics Markus Friedl (HEPHY Vienna) BPAC, 26 October 2015

Introduction Slider What’s New? Summary 26 October 2015M.Friedl: SVD Mechanics2

Introduction Slider What’s New? Summary 26 October 2015M.Friedl: SVD Mechanics3

Overview 26 October 2015M.Friedl: SVD Mechanics4 LayerRadius [mm] LaddersSensors / Ladder Slanted?Windmill angle [°] Overlap [%] x67.1

Components  Not shown: Outer shell (CF) 26 October 2015M.Friedl: SVD Mechanics5 Ladders End rings (SUS) Carbon fiber (CF) cone End flange (Aluminum)

Current Status: Rev. 2.4  Including all cooling pipes and connections to outside  Ladders are final – production has started  Now working on service routing outside of SVD volume 26 October 2015M.Friedl: SVD Mechanics6

Exploded Ladder (Layer 5) 26 October 2015M.Friedl: SVD Mechanics7 Origami flexes APV25 chips Airex spacer Silicon Sensors PCB Hybrid Pitch adapters Ribs FWD End Mount BWD End Mount

Introduction Slider What’s New? Summary 26 October 2015M.Friedl: SVD Mechanics8

Mounting a Ladder  Ladders are positioned by two precision pins  Fixed on backward side (origin)  Sliding on forward side to allow thermal movement 26 October 2015M.Friedl: SVD Mechanics9

Simple Lock Mechanism (SLM)  SLM is used in layers 4,5,6  No screw driver access from top  Pin fits into precision hole in end ring  Locked by set screw  Also provides cooling contact 26 October 2015M.Friedl: SVD Mechanics10 BWD FWD APV25 cover End mount Kokeshi pin = origin of ladder Swallow tail Precision hole Set screw hole

Accident With L5.001  2 issues came together:  Sliding (FWD) mechanism was not correctly adjusted (too much friction)  Too little glue between ribs and sensors  Ladder was thermally cycled (100 cycles, -30…+60°C)  Sensors detached from ribs 26 October 2015M.Friedl: SVD Mechanics11 Same location after repair

Thermal Cycling After Repair (1/2)  A few cycles between °C  Watched by camera (to confirm sliding action)  Same setup as already done on first class C ladder in January 2015  Motion due to CTE of aluminum support (ribs~0) 26 October 2015M.Friedl: SVD Mechanics12

Thermal Cycling After Repair (2/2)  Video:  Sliding works well!  Horizontal | vertical motion range: 370 µm | 180 µm  Comparable to L5.902 (class C) cycling in January:  Horizontal | vertical motion range: 310 µm | 130 µm  Conclusion: repair of slider successful! 26 October 2015M.Friedl: SVD Mechanics13

Introduction Slider What’s New? Summary 26 October 2015M.Friedl: SVD Mechanics14

What’s New Since November 2014?  Rev. 2.4 released  Isolators and pipe routing finalized  Ladder collision analysis  Vibration test  Cooling pipe bending  Set screw tool  Ladder mount tool  next presentation  Ladder transport container  Packaging and shipping  Ladder assembly status talk 26 October 2015M.Friedl: SVD Mechanics15

Cooling Pipes and Isolators 26 October 2015M.Friedl: SVD Mechanics16

Collision Analysis  2 weaknesses revealed  L6 rib to L5 FW clip: 0.16mm  Solution: make local dent in L6 ribs  Does not reduce stiffness  Result: 1.2mm clearance  Adjacent CO 2 clamps in L4: 0.63mm  Slightly reduce clamp thickness at end 26 October M.Friedl: SVD Mechanics

L6 Rib Solution  Add local dent (similar to L5)  Done in HEPHY machine shop  Does it weaken the structure? 26 October M.Friedl: SVD Mechanics

Finite Element Analysis  Rev 2.4  Deformation: 1.793mm (under unrealistic pressure) Rev local dent Deformation: 1.794mm (same conditions) Basically no difference 26 October M.Friedl: SVD Mechanics

Vibration Test (1/2)  Performed at INFN Pisa on a class C (non-functional, but mechanically precise dummy) L5 ladder 26 October 2015M.Friedl: SVD Mechanics20 Heavy support structure (resonance at 920 Hz)

Vibration Test (2/2)  0.2 g (left) and 0.6 g (bottom) sweeps from 20 to 1000 Hz show no resonances below 100 Hz 26 October 2015M.Friedl: SVD Mechanics21

L6 Cooling Pipe Bending (1/3)  Part 1: flat meander – easier than anticipated 26 October 2015M.Friedl: SVD Mechanics22 StoppersTape for pipes fixation

L6 Cooling Pipe Bending (2/3)  Part 2: 3D shaping – did not work well 26 October 2015M.Friedl: SVD Mechanics23 Linear guides Moveable Parts Origami pipe

L6 Cooling Pipe Bending (3/3)  Possible solutions:  Option 1: use flat pipe, as it is quite soft and easily follows 3D shape 26 October 2015M.Friedl: SVD Mechanics24  Option 2: do 3D bending in one step

L6 Cooling Pipe Pressure MPI  We attached one end to the water high pressure system and closed the other side  Increased pressure gradually from 0 to 300 bar  No movement of pipe could be seen  We waited 15 minutes and nothing happened  Finally pressure was taken away SUCCESS! 26 October M.Friedl: SVD Mechanics

Set Screw Tool 26 October 2015M.Friedl: SVD Mechanics26 Torque screw driver Flexible part

L5 Ladder Transport Container 26 October 2015M.Friedl: SVD Mechanics27  2 base plates – inner one has slits for source test Openings for source test (green lines show the way of the source test)

Source Test in Transport Container 26 October 2015M.Friedl: SVD Mechanics28 HEPHY we use our test box with an X/Z stage Source particles

Introduction Slider What’s New? Summary 26 October 2015M.Friedl: SVD Mechanics29

Summary  SVD design Rev. 2.4  Including isolators and pipe routing  New since February 2014:  Ladder collision analysis  Vibration test  Cooling pipe bending  Set screw tool  Ladder mount tool  Ladder transport container  Packaging and shipping 26 October 2015M.Friedl: SVD Mechanics30

BACKUP 26 October 2015M.Friedl: SVD Mechanics31

Packaging And Shipping  Different routes and approaches:  L3 ladders from Melbourne to KEK  Accompanied transport by aircraft  L4 and L6 ladders from IPMU to KEK  Transport by car  L5 ladders from Vienna to KEK  Transport by shipping company (aircraft cargo)  Recent test shipment with 2 class C ladders using same packaging and procedure as intended for class A ladders 26 October 2015M.Friedl: SVD Mechanics32

L5 Ladder Packaging 26 October 2015M.Friedl: SVD Mechanics33 Ladder transport container, Sealed in dry air volume