NA62 Gigatracker cooling28th October 2011

EN/CVPiero Valente, Michele Battistin

1

Thermodynamic requirements – Fluid: C6F14

– Total required cooling power : 300 W (safety factor=2)– Number of distribution loops = 3– Supply temperature = -25C– Loop temperature stability = ± 0.5K– Temperature difference between loops = 2 K– Design pressure: 16 bar– Pressure drop : to be defined by GTK collaboration

2

User requirements – VDF pump power supply for smooth start-up sequence– PVSS-UNICOSS control and supervision– Control cupboards installed in the remote protected area (200 m far)– Automatic control of loop flowrate– Automatic control of loop temperature– Remote control of delivery temperature and flow rate for each loop– Interlocks for high delivery pressure– Fully redundant operation: double chiller, heat exchanger and circulation

pump– Oil free cooling station– Pneumatically actuated valves– Cooling station to be tested in Meyrin site

3

Proposed solution– HCFC refrigerant redundant primary chiller (-40 °C)

– Chiller overall cooling power: 1.5 kW (including heat losses)

– C6F14 total mass flow = 0.330 kg/s (pre-design figure)

– Three main pipelines (OD 12) carrying 0.100 kg/s C6F14 flow each

– Three smaller pipelines (OD6) carrying a 0.011 kg/s C6F14 flow to each detector

– A heat exchanger for each line, located ≈1 meter close to the detector, will guarantee operating temperature setting of -25C

4

Proposed solution : P&I

5

Main pipelines OD 12

Detector pipelines OD 6

6

Planning– Engineering specification approval …….. End October2011

– System design ……………………………………. November-December 2011

– Procurement ……………………………………… January 2012-March 2012

– Installation ………………………………………… April-June 2012

– Tests…………………………………………………… July-September 2012

– Commissioning…………………………………… October 2012

7

Budget

– Material ………………………………………………..110 kCHF

– Electrical and control equipments ….……..30 kCHF

– Manpower………………………………….….……..40 kCHF

Total 180 kCHF