1. Totem Gas Systems ( T1, T2 ) F. Hahn and S. Haider PH / DT1

2. 07/03/2006 TOTEM Engeneering Design Review S.Haider, F.Hahn PH/DT1 2 Outline Work package General layout and functionality –Mixer unit –Gas Distribution unit Schedule Cost estimate Conclusions

3. 07/03/2006 TOTEM Engeneering Design Review S.Haider, F.Hahn PH/DT1 3 Gas system work package 2 gas systems: CSC (T1) and GEM (T2) –2 mixer units (not for 07 startup) –4 UX distribution units Each endcap 1 rack with 2 distribution units for T1 and T2 –Pipe work done by TOTEM and/or Criotec 2 control racks: –1 in SG and 1 in US for T1 and T2 –In SG, each system will have it’s own PLC control User interface in PVSS

4. 07/03/2006 TOTEM Engeneering Design Review S.Haider, F.Hahn PH/DT1 4 GEM’s (T2) CSC (T1) Gas: Ar/CO 2 70/30 Ar/CO 2 (CF 4 optional) 50/50 (40/50/10) Total volume:~40 litres400 litres Total flow:50-100 l/h70-200 l/h Chamber pressure1 mbar1 to 3 mbar Max. overpressure< 10 mbar< 20 mbar No. of Channels10 channels/endcap10 channels per endcap No. of Chambers20 per endcap30 per endcap No. of Distribution Racks1 per endcap General parameters Can we run from the CMS CSC mixer?

5. 07/03/2006 TOTEM Engeneering Design Review S.Haider, F.Hahn PH/DT1 5 Schematic overview of the gas systems Gas Rack situated on HF platform

6. 07/03/2006 TOTEM Engeneering Design Review S.Haider, F.Hahn PH/DT1 6 Gas mixing unit (not for ‘07 startup)T1T2 Gas 1 Ar 50 (40) Ar 70 Gas 2 CO 2 50 CO 2 30 Gas 3 CF 4 - (10) -

7. 07/03/2006 TOTEM Engeneering Design Review S.Haider, F.Hahn PH/DT1 7 Comments Mixer Module Both Mixer staged until second year of LHC running. In the first year: – Gas could be taken from CMS mixer –T1: Gas could be taken from CMS mixer ? (I have contacted OleG P. no reaction for the moment…) – –Otherwise one could use pre-mixed bottles like for T2.

8. 07/03/2006 TOTEM Engeneering Design Review S.Haider, F.Hahn PH/DT1 8 UX distribution unit for T1 and T2 Altogether there will be two racks of this type, one for each endcap.

9. 07/03/2006 TOTEM Engeneering Design Review S.Haider, F.Hahn PH/DT1 9 ~3 m T2 telescope 5 planes with 2 x 3 chambers Gas System: 3 chambers (on the same plane) are connected to one common gas supply

10. 07/03/2006 TOTEM Engeneering Design Review S.Haider, F.Hahn PH/DT1 10 Pipe connections for T1 and T2 UX distribution rack (one endcap): T1 T2 US UX US-UX supply / return Note: Return lines 4x Ø =12 mm And Analysis lines 4xØ = 6mm Are unused for the moment. Gas exhaust into the cavern! To / from T2 To / from T1 CO2 line for backup Analysis lines

11. 07/03/2006 TOTEM Engeneering Design Review S.Haider, F.Hahn PH/DT1 11 CMS Interaction Point T2 T1 UX distribution Rack for T1 and T2 Supply lines from USC: through central cable chain underneath CMS Top view: flexibles Gas pipes from Racks to Chambers: T1 : supply 10 * Ø = 4/6 mm Return 10 * Ø =10/12 mm T2 : supply 10 * Ø = 4/6 mm Return 10 * Ø =10/12 mm Note: Due to infrastructure all pipe runs have flexible parts requiring cable chains, etc.

12. 07/03/2006 TOTEM Engeneering Design Review S.Haider, F.Hahn PH/DT1 12 Schedule Production: –All material for 2 distribution racks are at CERN –Assembly will start beginning of February,- finish probably March, delivery > April possible Installation –Cables are procured now (by CMS / Totem) and installed for +Side from May onward –Gas rack installation will start around June –In July, Criotec will install the gas pipes to the UX racks Commissioning –Probably toward the end of 06 (t.b.c.)

13. 07/03/2006 TOTEM Engeneering Design Review S.Haider, F.Hahn PH/DT1 13 Preliminary cost estimate GEM (T2)CSC (T1) Gas Supply (special items only) -- Mixer17’00019’000 Pump, purifier, analysis-- Distribution22’000 Aux. Purge included in UX-Distribution Piping SG-USA not costed Piping USA-UXA not costed Detector Piping not costed Electrical Control40,000 Total materialSFr. 79’000SFr. 81’000 Manpower (racks)24,000 TotalSFr. 103’000SFr. 105’000 Mixer will increase by ~2’000 SFr

14. 07/03/2006 TOTEM Engeneering Design Review S.Haider, F.Hahn PH/DT1 14 Conclusions The Totem UX distribution racks are well established in our production line. Mixers will come later. Construction of UX racks has started, they will be ready in two months.