COMPASS

Gases

for the COMPASS detectors

(Run 2001)

Flammable gases in red. Please send corrections.

Gases for COMPASS Detectors (22.11.2001)
detector modules gases mixture volume projected flow
typical (max) 		consumption
during 2001 run 		comments in 2001
      % l l/h l/h    
MicroMegas 12 Ne/C2H6/CF4 80/10/10 12 12 (12) ?   50 %
DC Saclay 2 Ar/C2H6/CF4 45/45/10 1000 40 (100) ?   50 %
MWPC 13 Ar/CF4/CO2 74/20/ 6 1780 ? (700) 20/5/2 closed circuit 100 %
A     6 1050 ? (350)   100 %
A* 1 190 ?   (50)   100 %
B     6 540 ? (300)   100 %
GEMs 20 Ar/CO2 70/30 18 40 (100) 24/10   60 %
Straws 6 Ar/CF4/CO2 74/20/ 62000500 (1000) 70/20/6 open circuit2 22 %
MW1 2 Ar/CO2 70/30 3000 125 (375) ?   100 %
MW2 2 Ar/CH4 75/25 1800300 (1000)30/10   30 %
RICH1 PD 8 CH4 100 320 300 (5001) 150 closed circuit 100 %
CH4/iC4H10 >80/<20 320 300 (5001) optional
RICH1 rad 1 C4F10 100 100000 10000 (10000) ? closed circuit 100 %

1: The flow in both CH4 supply lines is hard-limited to 400...500 l/h due to safety requirements, so the original projected values (800 l/h) will never be availiable.
2: Closed circuit, as initially planned necessary.

This page was last updated on November 22, 2001 by Eric Weise