AION 100 – a strawman

 
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Ian Wilmut – on behalf of Pawel Majewski and
Tristan Valenzuela-Salazar
 
Aims
 
In our view the AION100 project needs a strawman for a
100m interferometer
These slides are an attempt to construct a strawman that
we propose to use as our starting point going forward.
This is not an attempt to design AION100, instead it is a
single set of options that 
COULD 
work
None of this is fixed, it can all be changed, all elements
remain open for discussion
 
Starting assumptions
 
Assume a shaft not a tower
Keep the shaft small – presently 2.4m diameter
2m shaft was attempted, but proved impractical (cold not extract hardware)
Plan to build in many small modules
Presently 5m modules –could sensibly be up to 10m sections
Assume minimum of 3 atom sources, could be many more
Up to one per module would be consistent with approach – this would be 20!
Assume crane access
Keep option of assembly hall at top or bottom of shaft
Build up from the bottom (down from top is difficult for crane)
Assume progressive testing as the system is assembled
Do not exclude fully commissioning (install, bake, vacuum) each module in turn
 
Shaft cross section
 
Working with assumed constraints
More space obviously makes things easier
Shaft
2.4m diameter shaft
Round
Perfectly vertical – any incline or bend will require a larger shaft
Platforms
2 independent access platforms in shaft
Each platform large enough for 2 people
Platforms to be able to carry atom sources, ion pumps up and down etc.
NOT free hanging, needs rails (avoids swinging cage colliding with
detector
 
 
 
Use of shaft cross section
 
Access platform
#1
 
Access platform
#1 drive ladder
 
Interferometer
services (full
length of shaft –
minimal
connectors)
 
Module brackets –
core bolts to shaft
wall
 
Access platform #2
– 2x people of 1x
person+ atom
source or similar
 
Atom source, in
cage and
removable
 
90
th
 percentile
male figure
 
Crane access -
enables limited crane
use with 2 platforms
 
Beam pipe
 
Ion pump
 
A single module
 
1 x
module –
5m
 
Welded steel
(or SS) frame
 
4x supports
along 5m
length
 
Structure has
closure
panels to help
keep things
clean
 
Removable
Ion pump
 
Side platform
for atom
source
 
Atom source
in removable
cage
 
Segmented
Shielding (2
layers)
 
Interface to
attach to
shaft brackets
 
Two modules in
shaft
 
Atom sources
can’t be lifted
into position
with crane – no
access*
 
* If we limit to 3 sources then they could be cranes in as just one will sit in the shaft and the others can be
orthogonal
 
Why build in 5m modules?
 
The modules must be able to be installed in the shaft, this defines the hall  height.
A 5m module requires a 7m hall to fit in the crane etc.
A 10m module would require a 12m hall!
Larger modules will reduce number of available sites
Building in situ will be very hard
Anything dropped 100m will do very significant damage
Manipulation of all the parts in the shaft will be difficult
Lots of crane work will be needed for long parts – much risk
5m modules assumed to be built on their side
Modules can be tested  (and maybe initial-baked) before installation
Large number of fasteners for shielding can be installed with good access – and no
risk from dropping
 
Beam pipe detail
 
X and Y
adjustments of
beam pipe position
(position and
straighten)
 
Inner shield (green)
 
Outer shield
(orange)
 
Beam pipe flange
 
Shield support (brown)
 
Field wire tubes
 
Vertical support
plate
 
Module frame
 
Closure panels
 
Top of pipe will have
fixed flange
Bottom of pipe to have
bellows and rotating
flange
Shield made from 8
phi segments 1->2m
long
Field wires in tubes to
enable replacement in
event of failure
 
Interface between modules
 
The module structures will have a gap between them
All loads and constraints will be defined and carried by the
brackets on the walls of the shaft
Closure sections of the shield will need to be installed in
situ around the vacuum flange interface
Note this interface will need to be able to move in Z for CTE
effects
This make up section needs to minimise dropping parts
Bellows will enable the beam pipe to connect and will be
pre-compressed to enable the modules to be positioned
before the sealing faces together.
Work needed on temporary caps
 
CTE
 
We need to understand the thermal profile of environment
A shaft will likely be very thermally stable
Unless there is non-constant work happening at the bottom that generates heat, or the tunnel complex
has multiple entries.
A tower will vary seasonally, especially if there is a large chamber at the top or bottom
100m of metal will:
Expand 1.2mm/K over its length if made from steel/iron
Expand 2.4mm/K over its length if made from Aluminium
Concrete has similar CTE to steel. This may somewhat mitigate tower thermal gradient.
CTE will need to be provided for in the design
In the case of the pipe the bellows probably provide adequate conformance
In the case of the shield, compliance will be needed
The structure will not be continuous so the CTE will be less significant to structure
 
Atom Source in a box
 
Atom Sources are designed to be completely removable
This is done by installing them into a frame
Present footprint is 1m x 600mm
Frame should be able to be closed and dust tight (IP51?)
Source will be able to be lifted by crane or lifted on the
access platform
The assumption is that all building, commissioning, testing
and repair of sources will happen not in situ
 
 
 
Crane access
 
Looking at the plan view it is evident that atom
sources and Ion pumps can’t be craned directly
up the shaft as higher sources obstruct the shaft
If we limit ourselves to 3 sources (top, middle,
bottom) we could orientate them so they can be
craned out (see doodle)
Is this a worthwhile limitation?
This would simplify the design (no need to carry
sources on access platforms), but would prevent
later additions
 
Top
 
Btm
 
Mid
 
Issues (list incomplete)
 
Dropping parts and tools
Keeping pipe clean as it is opened to attach next section
we don’t want 20 gate values
Position adjustments between module and shaft wall
Keeping dust out of everything
How to bake with self heating
Closing the shield at module breaks
Connecting field wires and maintaining tension
Penetrating shield with beam pipe supports without reducing shielding
Bellows forces (1800N vertically for a 6” pipe)
Pump locations and access
Service methodology and routing
 
 
 
Conclusion
 
To complete a full costing and making of a project plan we need an
agreed strawman to serve as a baseline
The AION community are asked if this can form such a model?
If it needs modification now is the time to do so
If we can agree this model then we can start a detailed costing
For now it is proposed that the AION 100 project costs everything
independently of AION 10 and then we remove duplication as we
start to see what can be shared.
Duplicate activities are assume to end up in AION 10
Slide Note
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The AION100 project presents a need for a 100m interferometer with a strawman proposal outlined by Ian Wilmut on behalf of Pawel Majewski and Tristan Valenzuela-Salazar. Starting assumptions include building in small modules, crane access, and progressive testing during assembly. Detailed shaft cross-section and module designs are discussed for efficient operation.

  • Interferometer
  • AION100
  • Ian Wilmut
  • Pawel Majewski
  • Tristan Valenzuela-Salazar

Uploaded on May 16, 2024 | 1 Views


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  1. AION 100 a strawman Ian Wilmut on behalf of Pawel Majewski and Tristan Valenzuela-Salazar

  2. Aims In our view the AION100 project needs a strawman for a 100m interferometer These slides are an attempt to construct a strawman that we propose to use as our starting point going forward. This is not an attempt to design AION100, instead it is a single set of options that COULD work None of this is fixed, it can all be changed, all elements remain open for discussion

  3. Starting assumptions Assume a shaft not a tower Keep the shaft small presently 2.4m diameter 2m shaft was attempted, but proved impractical (cold not extract hardware) Plan to build in many small modules Presently 5m modules could sensibly be up to 10m sections Assume minimum of 3 atom sources, could be many more Up to one per module would be consistent with approach this would be 20! Assume crane access Keep option of assembly hall at top or bottom of shaft Build up from the bottom (down from top is difficult for crane) Assume progressive testing as the system is assembled Do not exclude fully commissioning (install, bake, vacuum) each module in turn

  4. Shaft cross section Working with assumed constraints More space obviously makes things easier Shaft 2.4m diameter shaft Round Perfectly vertical any incline or bend will require a larger shaft Platforms 2 independent access platforms in shaft Each platform large enough for 2 people Platforms to be able to carry atom sources, ion pumps up and down etc. NOT free hanging, needs rails (avoids swinging cage colliding with detector

  5. Use of shaft cross section Access platform #1 drive ladder Access platform #1 Crane access - enables limited crane use with 2 platforms Interferometer services (full length of shaft minimal connectors) Beam pipe Atom source, in cage and removable 90th percentile male figure Ion pump Module brackets core bolts to shaft wall Access platform #2 2x people of 1x person+ atom source or similar

  6. Two modules in shaft A single module Interface to attach to shaft brackets Welded steel (or SS) frame Atom sources can t be lifted into position with crane no access* Segmented Shielding (2 layers) 4x supports along 5m length Structure has closure panels to help keep things clean Atom source in removable cage 1 x module 5m Side platform for atom source Removable Ion pump * If we limit to 3 sources then they could be cranes in as just one will sit in the shaft and the others can be orthogonal

  7. Why build in 5m modules? The modules must be able to be installed in the shaft, this defines the hall height. A 5m module requires a 7m hall to fit in the crane etc. A 10m module would require a 12m hall! Larger modules will reduce number of available sites Building in situ will be very hard Anything dropped 100m will do very significant damage Manipulation of all the parts in the shaft will be difficult Lots of crane work will be needed for long parts much risk 5m modules assumed to be built on their side Modules can be tested (and maybe initial-baked) before installation Large number of fasteners for shielding can be installed with good access and no risk from dropping

  8. Beam pipe detail X and Y adjustments of beam pipe position (position and straighten) Inner shield (green) Top of pipe will have fixed flange Bottom of pipe to have bellows and rotating flange Shield made from 8 phi segments 1->2m long Field wires in tubes to enable replacement in event of failure Field wire tubes Vertical support plate Module frame Outer shield (orange) Closure panels Beam pipe flange Shield support (brown)

  9. Interface between modules The module structures will have a gap between them All loads and constraints will be defined and carried by the brackets on the walls of the shaft Closure sections of the shield will need to be installed in situ around the vacuum flange interface Note this interface will need to be able to move in Z for CTE effects This make up section needs to minimise dropping parts Bellows will enable the beam pipe to connect and will be pre-compressed to enable the modules to be positioned before the sealing faces together. Work needed on temporary caps

  10. CTE We need to understand the thermal profile of environment A shaft will likely be very thermally stable Unless there is non-constant work happening at the bottom that generates heat, or the tunnel complex has multiple entries. A tower will vary seasonally, especially if there is a large chamber at the top or bottom 100m of metal will: Expand 1.2mm/K over its length if made from steel/iron Expand 2.4mm/K over its length if made from Aluminium Concrete has similar CTE to steel. This may somewhat mitigate tower thermal gradient. CTE will need to be provided for in the design In the case of the pipe the bellows probably provide adequate conformance In the case of the shield, compliance will be needed The structure will not be continuous so the CTE will be less significant to structure

  11. Atom Source in a box Atom Sources are designed to be completely removable This is done by installing them into a frame Present footprint is 1m x 600mm Frame should be able to be closed and dust tight (IP51?) Source will be able to be lifted by crane or lifted on the access platform The assumption is that all building, commissioning, testing and repair of sources will happen not in situ

  12. Crane access Looking at the plan view it is evident that atom sources and Ion pumps can t be craned directly up the shaft as higher sources obstruct the shaft If we limit ourselves to 3 sources (top, middle, bottom) we could orientate them so they can be craned out (see doodle) Is this a worthwhile limitation? This would simplify the design (no need to carry sources on access platforms), but would prevent later additions Mid Top Btm

  13. Issues (list incomplete) Dropping parts and tools Keeping pipe clean as it is opened to attach next section we don t want 20 gate values Position adjustments between module and shaft wall Keeping dust out of everything How to bake with self heating Closing the shield at module breaks Connecting field wires and maintaining tension Penetrating shield with beam pipe supports without reducing shielding Bellows forces (1800N vertically for a 6 pipe) Pump locations and access Service methodology and routing

  14. Conclusion To complete a full costing and making of a project plan we need an agreed strawman to serve as a baseline The AION community are asked if this can form such a model? If it needs modification now is the time to do so If we can agree this model then we can start a detailed costing For now it is proposed that the AION 100 project costs everything independently of AION 10 and then we remove duplication as we start to see what can be shared. Duplicate activities are assume to end up in AION 10

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