Upload
theola
View
40
Download
0
Embed Size (px)
DESCRIPTION
Status of BPIX Cooling Activities. W. Bertl, PSI. Where we stand now. Bpix cooling pipes layout has been designed based on - expected power load beyond LS2 with up to 500 fb^1 int.luminosity (using measured data of present Bpix and extrapolated for upgraded Bpix) - PowerPoint PPT Presentation
Citation preview
March 19, 2013 W. Bertl, PSI
Status of BPIX Cooling Activities
W. Bertl, PSI
March 19, 2013 W. Bertl, PSI
Where we stand now
Bpix cooling pipes layout has been designed based on
- expected power load beyond LS2 with up to 500 fb^1 int.luminosity (using measured data of present Bpix and extrapolated for upgraded Bpix)
- thermodynamics of 2-phase CO2 (typ. @ -20 / +15 ºC using Thome correlations)
- measured thermal conduction between coolant and sensor using a test setup (again scaled to upgraded system)
- reasonable coolant flow rates and acceptable pressure drops
Detailed technical drawings on Bpix piping exist (S.Streuli)
March 19, 2013 W. Bertl, PSI
Still to be done
- Verification of power load for new ROC chips under extreme beam conditions (including a realistic supply tube layout only small corrections expected)
- Experimental verification of thermodynamic calculations with a 1:1 mock-up (using one of the final cooling plants)
- Extending the experimental tests for asymmetric, accidental load conditions (like a sudden power failure on modules of one of the parallel cooling loops)
- Determination of the dimensions of the capillary pipes preceding each parallel cooling loop
- Testing the cooling down procedure under realistic conditions
- Designing and testing of an emergency power break in case of cooling loss
March 19, 2013 W. Bertl, PSI
Current activity
Construction of the 1:1 piping mock-up for half of Bpix.
Technical drawings made by Silvan Streuli based on design considerations
Construction at the University Zurich (P. Robmann and workshops) with 3D pipe bending outsourced to a Swiss company.
Two systems will be built. One system for the +x shell, one for the –x shell seen from one z-side. (+x/-x loops are based on a very symmetric layout (based on power load) and will share main supply loops. Cooling behavior in case of cooling losses at one side can be studied. Between +z and –z there is a strong symmetry and the cooling loops are decoupled.)
March 19, 2013 W. Bertl, PSI
One of the two systems under construction
Support disks to hold pipes in place - for suppy tube - for Bpix detector
Some pipes already placed into position
March 19, 2013 W. Bertl, PSI
Bpix “flange”
March 19, 2013 W. Bertl, PSI
Supply Tube Connections
March 19, 2013 W. Bertl, PSI
Two loops on Supply Tube
March 19, 2013 W. Bertl, PSI
Two loops on Supply Tube
March 19, 2013 W. Bertl, PSI
Conclusion
Mock-up construction:
After difficulties at the beginning (wrong steel type, problems with small bending radii) the progress of the pipe bending company is good now. Most parts for one system are delivered. Small connection pieces and fittings are available.
Completion of both piping systems (including leak testing) is expected for end of April.
Then heating clamps and temperature sensors can be mounted (by R. Becker).
Finally, the systems should be ready for operation tests using the Cern cooling plant.