status of the gas system c. garabatos, gsi
DESCRIPTION
STATUS OF THE GAS SYSTEM C. Garabatos, GSI. Schedule Supermodule infrastructure Back-up system Bubblers. Schedule. 09-10.06 Partial commissioning with Ar and 4-5 supermodules 11.06 Purifier and Membrane modules Closed-loop operation with Ar possible from 12.06 - PowerPoint PPT PresentationTRANSCRIPT
STATUS OF THE GAS SYSTEM
C. Garabatos, GSI
• Schedule
• Supermodule infrastructure
• Back-up system
• Bubblers
TRD C.M. Cheile Gradistei 26.09.05 C. Garabatos, GSI 2
Schedule
• 09-10.06 Partial commissioning with Ar and 4-5 supermodules
• 11.06 Purifier and Membrane modules Closed-loop operation with Ar possible
from 12.06
• 04.07 Full commissioning with Xe, analysis, recovery
Recovery plant lost!
TRD C.M. Cheile Gradistei 26.09.05 C. Garabatos, GSI 3
On-detector hardware
1234PT
To distributionrack on the Plug
Exhaust line surroundingthe full detectorpermanently flushedwith CO2.
Two or three detector modules are connected to the same return line.
The gas supply is individual.Three capillary lines per module.
Height zone ~1.2 mp = 0.4 mbar
On the detetcor:1) The pressure sensor for the active pressurecontrol of each height zone.2) A bubbler (two ways) connects each module to the exhaust line.
14 times
CO Flushing2
PDT
Total height ~7.6 mp = 2.6 mbar
xBUB xy43
xy25
xy25
TRD C.M. Cheile Gradistei 26.09.05 C. Garabatos, GSI 4
First ideas (B.W.)
Working on it...
TRD C.M. Cheile Gradistei 26.09.05 C. Garabatos, GSI 5
The CO2 back-up system
• Cumbersome, fires rarely, not écolo
(~100 l/h continuous CO2 flow)
• Decided to keep it anyway (O2)
• Replace CO2 by N2 ?
• ...
TRD C.M. Cheile Gradistei 26.09.05 C. Garabatos, GSI 6
Concerns with bubblers
1. Bubblers produce pressure fluctuations of several mbar
2. Bubblers may produce an increasing overpressure with increasing flow (~10 l/h)
3. Bubblers may spill oil into the detector
Design our own!
TRD C.M. Cheile Gradistei 26.09.05 C. Garabatos, GSI 7
Dynamics of pressure waves
TRD C.M. Cheile Gradistei 26.09.05 C. Garabatos, GSI 8
2nd prototype: many small holes
• 1.5 mm holes• Should be perfectly aligned• Thin holes• Extra horizontal grid• Small and simple
Thanks to Aramark!
TRD C.M. Cheile Gradistei 26.09.05 C. Garabatos, GSI 9
Performance
0 100 200 300 400 5000
1
2
3
4
5
6
7
8
9
10
Ove
rpre
ssur
e (m
bar)
Flow (l/h)
Expect improvements with 3rd, professional prototype