making modules for the velo upgrade - cern · pro’s for titanium modules they are cheap 300 euro...
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![Page 1: Making modules for the VELO upgrade - CERN · Pro’s for titanium modules They are cheap 300 euro for a finished substrate with connectors. They are sturdy, high pressure. Fast lead](https://reader036.vdocument.in/reader036/viewer/2022070801/5f0287cf7e708231d404b8f9/html5/thumbnails/1.jpg)
Making modules for the
VELO upgrade
An upgrade LHCb Velo Module talk about bending & building modules
By Freek Sanders
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2
Introduction
Bending
Building
The future
Conclusion
Backup
Building Velo Modules
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3Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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4
Introduction
Bending
Building
The future
Conclusion
Backup
Building Velo Modules
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Lhcb
5Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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6
The Upgrade Velo
Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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7
2 halves
26 modules each
First pixel ~5mm
from the beam
Velo Top View
Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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8
Velo 3D Section View
Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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9
Velo Section View
LHC vacuum
RF foil to separate
LHC vacuum & LHCb
vacuum
Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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10Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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11Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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12Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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13
The upgraded parts
Interaction Point
Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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The bare module
1. Microchannel Cooling Substrate
2. Hurdle, support structure
3. VCR Fitting for CO2 in- & outlet
4. Interface with rest of detector
Building Velo Modules 14
1
2
3
4
Introduction
Bending
Building
The future
Conclusion
Backup
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Area moment of inertia - I
15
𝐼𝑥 =𝑏ℎ3
12
𝐼𝑦 =𝑏3ℎ
12
Gives resistance against bending, the higher I the more it restricts bending.
Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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Building Velo Modules 16
Stiff
Fle
xib
le
Thickness 500 µm
Thickness 10 mm
Stiffness of the module
114 m
m
Introduction
Bending
Building
The future
Conclusion
Backup
𝐼𝑦 =𝑏3ℎ
12
Bottom part is
~8000x stiffer,
because b is 20x
bigger
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17
- All electrical test in vacuum
- Deformations in LHCb Z
- Thermal measurements
Building Velo Modules
Setup for validating the modules.
Introduction
Bending
Building
The future
Conclusion
Backup
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18Building Velo Modules
Displacement
measurement.
Introduction
Bending
Building
The future
Conclusion
Backup
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19Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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VCR induced torque
Building Velo Modules 20
By connecting the VCR a torque
on its pipes is introduced. This
is due to the metal/metal seal
Introduction
Bending
Building
The future
Conclusion
Backup
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Connecting VCR induces displacements
Building Velo Modules 21
10:36 - Tighten VCR long side, less then finger tight, so there should be no torque. but the capillary is in the right position
10:39 - Tighten VCR long side, first finger tight, then 1/8 turn.
10:40 - Tighten VCR short side, less then finger tight, so there should be no torque. but the capillary is in the right position
10:42 - Tighten VCR short side, first finger tight, then 1/8 turn.
10:45 - Loosen all VCR first short then long. (the gasket got stuck under the module. Took some effort to get it out. That is
why the signal does not get stable until 10:48)
Displacement of +500 µm to – 400 µmIntroduction
Bending
Building
The future
Conclusion
Backup
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Add a Clamp to hold pipes
22Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
Made from Peek
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23Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
Displacement measurement with clamp
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24
Misalignment of VCRs
Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
![Page 25: Making modules for the VELO upgrade - CERN · Pro’s for titanium modules They are cheap 300 euro for a finished substrate with connectors. They are sturdy, high pressure. Fast lead](https://reader036.vdocument.in/reader036/viewer/2022070801/5f0287cf7e708231d404b8f9/html5/thumbnails/25.jpg)
25Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
![Page 26: Making modules for the VELO upgrade - CERN · Pro’s for titanium modules They are cheap 300 euro for a finished substrate with connectors. They are sturdy, high pressure. Fast lead](https://reader036.vdocument.in/reader036/viewer/2022070801/5f0287cf7e708231d404b8f9/html5/thumbnails/26.jpg)
The bare module
1. Microchannel Cooling Substrate
2. Hurdle, support structure
3. VCR Fitting for CO2 in- & outlet
4. Interface with rest of detector
Building Velo Modules 26
1
2
3
4
Introduction
Bending
Building
The future
Conclusion
Backup
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Coefficient of thermal expansion
27Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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28Building Velo Modules
Coefficient of Thermal Expansion
Stolen from younger me https://indico.cern.ch/event/469996/contributions/2148100/
Temperature dependent material properties
Introduction
Bending
Building
The future
Conclusion
Backup
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Full module
1. Tiles
2. Readout Hybrids
3. Data Cable
4. Low voltage cable
Building Velo Modules 29
1
2
3
4
Introduction
Bending
Building
The future
Conclusion
Backup
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30
Copper ~ 16,7
Silicon ~ 2,6
Coefficient of Thermal Expansion
Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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Where we came from
Building Velo Modules 31
Introduction
Bending
Building
The future
Conclusion
Backup
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A 3 part readout hybrid attach to
microchannel with Araldite 2011
32Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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Building Velo Modules 33
Changed glue to a flexible glue.
Used a flexible glue to absorb the CTE difference, Loctite SI 5145
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Building Velo Modules 34
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Overview of jigs used in production
35
Glue robot
Glue station
Sensor cure
Hybrid cureHybrid pick up
Sensor Pick up
Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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Placement and gluing of Tiles, the
important bits.
36Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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Degree of freedom (DoF) refresher
37Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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Motion stages to control 3 DoF
The jig only takes over these 3.
The rest are determined by natural deformity of the substrate. +/- 80 um
38Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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Main jig, which hold the module
39Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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Vacuum pick up
40Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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Constant force springs
41
𝐹 = 𝑘 ∗ 𝑥
Hooke’s Law
Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
To cope with
small variation
in tile thickness
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Constraining 3 DOF from the motion
stages.
42
2 movements 1 rotation constraint
Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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Problems with the Jigs
Positional accuracy,
Changed material from Teflon to POM-C
Increase of Vacuum surface, increase of vacuum power.
Still some issues
Stages moves when tiles are picked up. This is due to spring force.
Could be solved, but need major changes to jig.
43Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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The gluing step.
44Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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Trouble with glue trapping air.
Once glued you can not see the glue anymore. How well did we glue?
Building Velo Modules 45
Introduction
Bending
Building
The future
Conclusion
Backup
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Building Velo Modules 46
Silicon is invisible to infrared.
You can see
through the
silicon and
see the
glue!
Introduction
Bending
Building
The future
Conclusion
Backup
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Merged glue lines.
It is not
always good
to see your
work.
47Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
Trapped air, degassing
in vacuum
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Gluing without trapping air!
Glued to a glass plate, to check for
spread.
48Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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Production sites
Almost everything the same. Except the placement of the tiles
mentioned in this talk.
The results are comparable.
Building Velo Modules 49
2 Module production sides
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What are we still doing
Measuring thermal performance of modules.
Optimizing glue coverage of modules.
Getting experience, every module we make, becomes a
better module.
I dare to say that our current module is detector grade.
50Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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The Past
1,5 year ago, there were
some doubts about the
microchannel. So a side
research project was
launched.
Plan Z, the ‘final’ solution.
But before it could prove it
self the microchannel
proved it was ready for use
in the upgrade Velo.
51Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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Titanium 3d printed “micro” channel.
CTE of SI is 2,6 Copper Kapton
is 16, Meet in de middle.
Titanium CTE 8,6
Titanium grade 5 is the
mostly used for printing, but
a bad conductor 6,7 Wm-1K-1
Titanium grade 2, 16,4 Wm-
1K-1 not great but al lot
better.
Restriction of 200x200 µm
Channel of 500x500 µm
Building Velo Modules 52
Introduction
Bending
Building
The future
Conclusion
Backup
Xray of first titanium subtrate
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Pro’s for titanium modules
They are cheap 300 euro for a finished substrate with connectors.
They are sturdy, high pressure.
Fast lead time. 7 weeks for drawing to production quality substrates
3D printing, lots of room to optimize shape/performance
Once well understood précises substrates can be made.
They could serve as disposable modules in high radiation environments.
53Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup
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Secret Plan to make a Titanium Module*
Mircochannel are the critical
component in Velo production.
Other parts are ‘less’ scarce.
Can be made with the same
production jigs.
Could also be used to test
other ASIC’s
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Introduction
Bending
Building
The future
Conclusion
Backup
Building Velo Modules
* Will not be installed with the velo, but used for
validation titanium printed cooling substrates
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Velo Institutes
55
Introduction
Bending
Building
The future
Conclusion
Backup
Building Velo Modules
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Liked the talk?
We are looking for a house/apartment in Nyon
3 bedroom, or living room that can be split for guests.
Max 3000 Fr, all-in
Building Velo Modules 56
Introduction
Bending
Building
The future
Conclusion
Backup
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Questions
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Introduction
Bending
Building
The future
Conclusion
Backup
Building Velo Modules
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58
Introduction
Bending
Building
The future
Conclusion
Backup
Building Velo Modules
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Building Velo Modules 59
There is no
backup, RUN!!
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Positions pt100 – Bare module NRD006
60
Numbers in blue are the PT100s that are on slide 26, In orange
are the positions of the previous module.
Building Velo Modules
Introduction
Bending
Building
The future
Conclusion
Backup