ATLAS ITk BD2 R&D Project
Claudio Bortolin (EP-ADO-PO)
Bart Verlaat (EP-DT-FS)
Lukasz Zwalinski (EP-DT-FS)
ATLAS cooling team – 2016
ATLAS ITk and CO2
During LS3 a new tracker (Pixels and strips) will replace the actual Inner Detector.
The total power to be remove from the new detector will be about 159kW (PIXELS only) with
a maximum working temperature of -35 C in any location of the detector using CO2 as
coolant. In order to meet these specifications it will be required to install a certain number of
distribution manifolds inside the ATLAS toroid (PP2) connected to 5 cooling plants (+1 for
redundancy) of 30kW each operative in the service cavern of ATLAS.
The total number of loops will be in the order of ≈1000 and the fluid distribution balancing
will be a critical task.
The maximum evaporation temperature of -35 C can be achieved considering the cooling
capabilities of the plants and the pressure gradients between the detector and the cooling
stations.
What is the minimum attainable temperature achievable in any location on the detector
(cooling pipe temperature)?
What is the best design of the transfer lines and manifolds to distribute the fluid properly
keeping as low as possible the pressure gradient in the return pipe?
The goal of the Baby-Demo project is to answer to these questions that will be part of the
TDR of the ITk pixel detector to be submitted before the end of 2017.
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Baby-Demo project
It consists of:
•
Baby-Demo1 (BD1): design, construction and operation of a
5kW (the size of 1 transfer line) cooling plant to demonstrate
the operation of the CO2 plant at the lowest attainable
temperature.
•
Baby-Demo2 (BD2): the design, construction and installation
of a full scale fluid distribution setup according to the real
piping paths available in the experimental cavern. This
installation will be coupled to the produced BD1 cooling plant,
to demonstrate the full system loop performance in realistic
conditions with realistic prototype detector structures. Where
the height differences will play a key role.
Junction box
Manifold boxes
Vacuum insulated transfer line
Vacuum insulated
concentric tubes
(7x1.6x0.3mm
inlet inside
4x0.5mm outlet)
Vacuum terminal
and concentric
split
Vacuum line
Tile Calorie
LAR
Tracking
Connection
tube bundle
14x 3x0.5mm
ID end plate dry volume
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Baby-Demo BD2 in building 180
It consists of a cooling infrastructure setup which include the design, production and
installation of 1 or 2 transfer lines (foam and/or vacuum insulated), distribution
manifolds and “splitter box” concepts development equipped with many p,T sensors
connected to a DAQ system. These elements will be used to connect the CO2 cooling
plant (BD1) to the detector load modules, in a real scale environment, using the ATLAS
Inner Detector distribution 1:1 scale mockup available in building 180.
ATLAS Project Office agreed to
help with the infrastructure
design.
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Infrastructure layout: Sector 5
The actual position of the mock-up with the plant installed at the ground level is
correct to reproduce the sector 5 manifold height difference.
Electrical Cabinet
PP2 box with
PT & TT Sensors
Cooling Station
PP1 box with
PT & TT Sensors
Foam box with
detector
measurements
Use of the B180 basement
agreed with TSO.
HSE contacted to discuss
about CO2 piping
installation in a closed area.
PP2 box with
PT & TT Sensors
Realistic height differences
Crane limit
switch
Sector 5
Access Platform
2230 mm
3000 mm
USA 15
Compressors Room
Floor
Sector 13
Platform between Muon BIL-BML,
over metal rack (0.4 x0.5 x2.5m) or
on the area of existing PP2 box
Sector 13
Platform between Muon BML-BOL
1200 mm
530 mm
1700 mm
6435 mm
8979 mm
IP 0
3800 mm
In order to test the sector 13
distribution the Foam Box
should be moved up of 1.2m
Picture taken from presentation of Dina Giakoumi
(ITk cooling meeting 15.03.2016)
9600 mm
8110 mm
3000 mm
BD1 & DB2 schedule
The target is to provide the answer what is the minimum attainable temperature in the
detector modules before the end of 2017 for the Pixels TDR
Baby DEMO
BD2 schedule (taken from the Baby-Demo project schedule):
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Transfer lines design
Before the end of 2016 the design of the distribution parts should be completed
Concentric Transfer lines and manifolds: from the cooling station to PP1, totally
vacuum insulated or only from PP2 to PP1, keeping as a backup solution, the TL from
the plant to PP2 standard insulated with Armaflex.
Vacuum TL
Vacuum or Armaflex
insulated TL
Design in collaboration with
(preliminary contribution
offered from):
MPI (Germany)
ANL (US)
UK institutes
Vacuum TL
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PP1 box design: 1 line with warm nosing
Dry-air volume
Warm nose loop
Well accessible standard VCR type connectors +
Electrical breaks
IDEP
Detector volume
Vapor return
Liquid feed
Warm nose loop
Slide taken from presentation of B. Verlaat
(ITk cooling meeting 15.03.2016)
If the detector boundary becomes the dry-air boundary than warm nosing is not possible!
Design: Genova (Italy)? Others?
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Detector foam box construction – possible concept
PIXELS Innermost Layers
Z=0
Z=-1400
Z=-3000
Z=+1400
L1 ~750W
L0 ~ 400W
Z=3000
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






Line cooling pipe ~ 4KW
Orifice
orifice
Local Support
Liquid Flow
Pictures taken from presentation of D.
Giugni (ITk cooling meeting 15.03.2016)
A test setup for the orifice design will be prepared soon in ATLAS SR1 using a foam
box available at Crystal palace. Once the test will be over the same FM can be used
for BD2.
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Conclusions
 The Baby-Demo (BD) project: in order to define the minimum attainable temperature
of the detector modules it has been recommended to build a test setup to reproduce
the pressure gradients from the cooling plant to the detector.
 The BD project consists of 2 main tasks, the design and construction of:
• a CO2 cooling station (BD1)
• the replica of piping distribution from the plant to the detector module (BD2).
 As regards BD2, the installation of the real scale piping distribution will be carried out
using the ATLAS Inner Detector distribution 1:1 scale mockup available in b. 180. The
use of the building basement has been agreed with the TSO and soon I will discuss
about the safety aspects with HSE.
 Agreed with the project office of ATLAS to design the support structures.
 The help and support of the ITk institutes is fundamental on the design and
development of the cooling distribution: TLs, PP2 manifolds and the PP1 splitter box.
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