1. ATLAS Thermosiphon Readiness Review 17th March 2016
Anders Andersen, Said Atieh, Renaud Barillere, Michele Battistin, Olga Beltramello, Stephane Berry, Alexandre Bitadze, Pierre Bonneau, Rusty Boyd, Claudio Bortolin, Banjamn Bradu, Johan Bremer, Ariella Cattai, Florian Corbaz, Olivier Crespo, Cyril De George, Beniamino Di Girolamo, Jose Direito, Fido Dittus, Martin Doubek, Gilles Favre, Didier Ferrere, Danilo Giugni, Jan Godlewski, Greg Hallewell, Andre Henriques, Sergei Katunin, Wieslaw Ivanski, Daniel Lefils, Didier Lombard, Sergey Malyukov, Steve McMahon, Dimitar Mladenov, Stefano Moccia, Rene Necca, Marzio Nessi, Sylvain Nichilo, Fernando Pedrosa, Elena Perez, Ludovico Pontecorvo, Dave Robinson, Cecilia Rossi, Vic Vacek, Lukasz Zwalinski

2. Why we are here Description of the system
Description of the running modes
Control of the system
Commissioning main results
Risk analysis
Are we all sure enough we can safely run on detector?
17/3/2016

3. The ATLAS ID Evaporative Cooling
Situation in
Compressor reliability
Vibrations – Leaks (slightly activated fluid)
Increase of dust (compressor wear)
7 Haug
compressors
condenser
liquid
tank
mixed water
Sub-cooler
pneumatic
valve
pneumatic
valve
others
manual
valve
4 liquid lines PR
thermal
screen
UX15
USA15
dummy
load
pixel
manual
valve
6 X SCT
4 gas lines
BPR
manual
valve
17/3/2016

4. Why a Thermosiphon Solution
condenser
liquid
tank
Heater
pneumatic
valve
Low temperature
Chiller
USA15
Surface
From
compressors To
Improvements
No active elements
Reduction of leaks (activated coolant)
No reason to “open” the circuit
Recover design ID cooling T (-25°C) (ID-HEX)
Possible decrease T (-30°C) with blends C3F8-C2F6
pneumatic
valve
others
manual
valve
4 liquid lines PR
thermal
screen
UX15
USA15
dummy
load
pixel
manual
valve
6 X SCT
4 gas lines
BPR
manual
valve
17/3/2016

5. The evaporative thermodynamic cycle
HEX subcooling
liquid line to detector
condensation
HEX recuperation
Capillary pressure drop
compression
heater
evaporation
gas line from detector
17/3/2016

6. A new thermodynamic cycle
HEX subcooling
liquid line to detector
By-pass heating
HEX recuperation
Capillary pressure drop
heater
evaporation
Liquid column
gas line from detector
Condensation
17/3/2016

7. Did we have any alternative?
In 2009 ATLAS Cooling Group (J. Godlewski, D. Giugni, M. Battistin) has launched an extended research of alternative solutions to HAUG Compressors:
Oil Free Screw
Labyrinth Piston
Membrane
Centrifugal
Turbo
Labyrinth
Screw
Membrane
Oil remained a large obstacle -> capillaries in activated region -> clogging
17/3/2016

8. Thermosiphon Overall Schematics
Thermosyphon Circuit
Chiller Circuit
Low Temperature Stage
High Temperature Stage
C3F8
R23
R404a
Primary Water
TS Condenser
-60°C
Water Circuit
Brine Circuit
C6F14
-70°C
-30°C
+27°C
+25°C
-60°C
liquid
-15°C
gas
-25°C
-15°C
By-pass
Full power dummy load
+20°C
gas
+20°C
liquid
60 -25°C
1.2 kg/s
Short review of main components ->
17/3/2016

9. …let’s see pictures of different components
Lay-out in ATLAS
Water circuit
Low T chiller
Brine circuit
Condenser
C3F8 piping
“Balcony” by-pass unit
Evaporative connection
ATLAS Surface
PX15
USA15
UX15
…let’s see pictures of different components
17/3/2016

10. Water skid location in SH1
Water Circuit
Water circuit skid
Primary water heat exchanger
Water skid location in SH1
17/3/2016

11. -70 °C - 180 kW two stage chiller
17/3/2016

12. Brine pumps and piping
17/3/2016

13. Condenser on SH1 roof
17/3/2016

14. “balcony unit” – by-pass
17/3/2016

15. Connection to the evaporative
Liquid
connection
Gas
connection
17/3/2016

16. Sonar System (G. Hallewell)
17/3/2016

17. Can we run on ID detector?
Electrical lay-out
Control architecture
Commissioning results
TS – Evaporative swap
On detector cooling test procedure
Risk analysis
Q&A
I take this opportunity to thanks all the TS team !!!
17/3/2016