STATUS OF THE GAS SYSTEM C. Garabatos, GSI

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!


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


First ideas (B.W.)

Working on it...


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 ?

• ...


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!


Dynamics of pressure waves


2nd prototype: many small holes

• 1.5 mm holes• Should be perfectly aligned• Thin holes• Extra horizontal grid• Small and simple

Thanks to Aramark!


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

STATUS OF THE GAS SYSTEM C. Garabatos, GSI

Documents

small holes

co2 backup systemcumbersome

o2replace co2

recovery recovery plant

partial commissioning

ar possible

lh continuous co2 flowdecided

increasing flow