COMPASS

Gases

for the COMPASS detectors

(Run 2002)

Flammable gases in red. Please send corrections.

Gases for COMPASS Detectors (7.6.2002)
detector modules gases mixture volume typical flow consumption running cost
total
(splitted) 		comments
      % l l/h l/h CHF/d  
MicroMegas 12 Ne / C2H6 / CF4 80 /10 / 10 12 12 9.6 / 1.2 / 1.2 35.63
( 26.33 / 0.4 / 8.90 ) 		 
DC Saclay 2 Ar / C2H6 / CF4 45 / 45 / 10 1000 16 7.2 / 7.2 / 1.6 14.43
( 0.26 / 2.93 / 11.78 ) 		installation of DC3
scheduled for
mid June '02
MWPC 14 Ar / CF4 / CO2 74 / 20 / 6 1955 760 26 / 7 / 2 52.56
( 0.94 / 51.54 / 0.08 ) 		closed circuit;
without W45 yet (consumption
and running cost will probably
increase by ca. 30%)
A    7 1225 410 one additional
chamber installed
A* 1 190 50  
B     6 540 300  
W45 2 ? ~100 included in MWPC gas system
GEMs 10 Ar / CO2 70 / 30 18 40 26 / 11 1.39
( 0.94 / 0.45 ) 		 
Straws 1 1) Ar / CF4 / CO2 74 / 20 / 6 350 ? 45 / 12 / 4 90.15
( 1.62 / 88.36 / 0.17 ) 		closed circuit;
installation of
1 additional submodule
planned
MW1 2 Ar / CO2 70 / 30 3000 125 60 / 50 4.22
(2.16 / 2.06) 		 
MW2 6 Ar / CH4 75 / 25 1800 240 180 / 60 38.72
( 6.48 / 32.24 ) 		800 l/h N2 flushing
per module
RICH1 PD 8 CH4 100 320 300 60 32.24
( - ) 		closed circuit
RICH1 rad 1 C4F10 100 800002) normal: 5000
fast: 500003) 		- 4) - 4) closed circuit
sum of running cost:
269.34 per day

1): 1 module = 2 submodules = 2*3 double layer
2): just the vessel; total volume of the system, including filters and pipes is about 100000 l
3): new fast circulation system, wich bypasses the filters to improve the thermalisation of the gas
4): estimation of the total consumption (due to losses in the filters) during the 2002 run: 200 kg <=> 22400 CHF

Previous versions of this table: Run 2000, Run 2001

This page was last updated on June 17, 2002 by Eric Weise