1. Meeting RPC Gas Task Force Meeting – 15 A. Sharma January 21st, 2009 http://indico.cern.ch/conferenceDisplay.py?confId=50540

2. Closed loop All racks on CL 2.2 m3 /hr gas is circulated 7% fresh gas Some leaks repair(ed), broken gas inlets repair(ed), Shutdown with humidified Argon, with small current Purifiers : P1 (molecular sieve) in automatic mode with change over every 200 m3 (which is an equivalent of about 100 hours) P2 (Nickel filter) also automatic change over after 840 m3 ( about 14 to 16 days) The conditioning sequences for both purifiers are automatic. Humidifier: stable at ~ 6000 ppm ATLAS Meeting RPC Gas Task Force Meeting – 15 January 21st, 2009 Closed loop All racks on CL, Wheels (all?) REs (positive and ?) 10 % fresh gas (?) Some leaks repair(ed) Shutdown with humidified Argon, with small current New Infrared analyzer ok Gas Chromatograph Status New sampling points Purifiers: P1: Molecular Sieve (10% 5Å, 90 % 3 Å). Purifier saturated when the water concentration starts to rise from the set-point (8500 ppmV). (~ 1 wk) P2: Metallic filters (25% Cu; 25% Cu-Zn; 50% Ni Al2O3) The saturation of O2 takes about one month. Restart – Last week of Jan (ie next week) CMS

3. GIF: Gas Studies ATLAS Studies CMS Forward RPC Studies Meeting RPC Gas Task Force Meeting – 15 January 21st, 2009 2008 RPC Gas Consumption: Approx. 50 K CHF for each ATLAS and CMS ( to be verified with Mats)