1. 26/03/2014L-Ph. DE MENEZES & F. MERLET CERN/PH-DT-DI1 2013 New recuperation system for n-Pentane:  Installation of the module in parallel of the first recuperation  Coordination of the safety gas detection  Test and running for a week (Result at 3500l/h, increase of the recuperation by nearly a factor 2). Maintenance and modification of the first recuperation:  Dismountling and rebuild of the recuperation as the new one  Installation and test forseen in summer 2014. Modification of the system to reach the new specification:  New specification ask by the detector team: nominal flow from 2500 l/h to 5000 l/h. (Means new Mixer, new Purifier and new Pump)  Dismountling of the mixer and purifier.  New modules in construction and hopefully ready for summer.  Installation and test forseen in summer 2014. PH-DT-DI 2013/2014 ATLAS activities TGC gas system

2. 26/03/2014L-Ph. DE MENEZES & F. MERLET CERN/PH-DT-DI2 2013 Modification of the 5 distribution input valve:  The idea was to reduce the pressure increase at the start-up of the modules. Leak search on the distribution:  Reduce C2H2F4 consumption and monitor the increase of Oxygen inside the system Modification of the distribution for detector safety:  Quick connector change at the output of the chambers  Installation of hand valves to open chamber to air during long stop. Modification of the system to reach the new needs:  Actual flow of 3000 l/h increase to 5000 l/h  Modifiaction of the pump module (passing from 2 pumps to 3 pumps)  Gas line from USA 15 to SGX1 has been double with another 28mm pipe. 2014 Modification of the purifier pilot valves and new pressure regulation device:  To improve purifier module and buffer pressure regulation. PH-DT-DI 2013/2014 ATLAS activities RPC gas system

3. 26/03/2014L-Ph. DE MENEZES & F. MERLET CERN/PH-DT-DI3 2013 Modification of the distribution pilot valves:  During stops some channel valves stayed open because of leak inside pilot valve blocks (around 450 pieces in total for all systems). PH-DT-DI 2013/2014 ATLAS activities MDT gas system

4. 26/03/2014L-Ph. DE MENEZES & F. MERLET CERN/PH-DT-DI4 2013 NEW MIXER WITH ARGON MIXTURE  supply mixture with argon to leaky chambers Recalibration of Mass flow controlers  adapt some flow to new requests PH-DT-DI 2013/2014 ATLAS activities TRT gas system

5. 26/03/2014L-Ph. DE MENEZES & F. MERLET CERN/PH-DT-DI5 PH-DT-DI 2013/2014 ATLAS activities LUCID gas system 2013 LUCID Gas system dismountling :  Dismounting of the 2 distribution racks in the cavern  Dismounting of the Pré-distribution rack in the USA15

6. 26/03/2014L-Ph. DE MENEZES & F. MERLET CERN/PH-DT-DI6 PH-DT-DI 2013/2014 ATLAS activities TFC gas system 2013 TFC pump maintenance:  Problem with the new pump after 3 months of running.  Restart of the full system Mars 2014

7. 26/03/20147 PH-DT-DI 2013/2014 CMS activities 2013/2014 Gas systems/Analysis maintenance list: circulation pumps safety valves and bubblers power supplies profibus quality pressure regulators analysis devices fill TGC with N-Pentane check/repair heating cables/connectors calibrations MFC L-Ph. DE MENEZES & F. MERLET CERN/PH-DT-DI

8. 26/03/20148  A lot of activities completed/on-going during 2014  Many new consolidation projects for all experiments Conclusions L-Ph. DE MENEZES & F. MERLET CERN/PH-DT-DI