LHC Machine Advisory Committee Meeting no.19 QRL status 16 June 2006 G. Riddone, AT-ACR On behalf of the QRL team

MAC No.19, June 2006GR, AT-ACR2 Content Layout Fabrication status Installation status Schedule Conclusions

MAC No.19, June 2006GR, AT-ACR3 QRL layout QRL is a continuous cryostat of ~3.2 km length no header (4 or 5) sectorisation  9 vacuum sub-sectors  vacuum insulation separate from machine QRL elements in one sector ~ 38 service modules ~ 40 fixed point/vacuum barrier elements ~ 235 straight pipe elements ~ 10 steps/elbows ~ 1-2 cryogenic extensions

MAC No.19, June 2006GR, AT-ACR4 QRL layout Sector sectors: - 7 installed by Air Liquide - 1 re-installed by CERN  = 650 mm E-F= B,C,D = 4-20 K Sector 5-6

MAC No.19, June 2006GR, AT-ACR5 QRL fabrication status

MAC No.19, June 2006GR, AT-ACR6 QRL installation status External supports (~ 700/sector) Progress: 97 %

MAC No.19, June 2006GR, AT-ACR7 QRL installation status Positioning and alignment (~ 325 elements/sector) Progress: 86 %

MAC No.19, June 2006GR, AT-ACR8 QRL installation status Welding and testing: ~ 325 interconnections/sectors  ~ 2000 inner welds made by orbital welding machine »~ 180 “O” type interconnections (1 butt-weld per header) »~ 75 “C” type interconnections (2 butt-welds per header) »~ 70 “A” type Interconnections (3 welds per header)

MAC No.19, June 2006GR, AT-ACR9 QRL installation status “C” type interconnections “A” type interconnections Special interconnections Inner weld progress: 85 % - Nominal rate: 20 int./w - Achieved rate: 30 int./w

MAC No.19, June 2006GR, AT-ACR10 QRL installation status Mounting of superinsulation Welding of external compensators and visual check External weld progress: 81 % - Nominal rate: 20 int./w - Achieved rate: 35 int./w

MAC No.19, June 2006GR, AT-ACR11 QRL installation status NDT tests »Internal (video camera) and external visual control: 100% »Radiography tests: from 100% to 10% as a function of weld quality »Leak tightness tests: 100 % Helium to insulation vacuum –each weld (header pressurization at 1 bar): < mbar·l/s –each sub-sector (header pressurization at 3 bar): < mbar·l/s –each sector (in parallel with pressure test): < mbar·l/s Air to insulation vacuum: mbar·l/s

MAC No.19, June 2006GR, AT-ACR12 QRL installation status Percentage of defects of inner welds (visual and radiographic inspections) for the 3 types of interconnections: »According to machine parameters two categories are defined (B and CDEF) Air Liquide target value: 3% Main defects: porosity, lack of fusion, metallic inclusions

MAC No.19, June 2006GR, AT-ACR13 QRL installation status Number of internal leaks (helium to insulation vacuum) »on installation welds: 8/ detected with the clamp shells 1 detected in sector 6-7 during the test of the sub-sector (reason: operator error during the test with clamp shells) »on internal compensators: 2 (sector 3-4) »on backing rings: 2 (sector 4-5) »on service modules (header F): 7 (6 in sector 8-1 and 1 in sector 4-5) Number of external leaks (air to insulation vacuum) on installation welds: »Sector 8-1: 12/4250 »Sector 4-5: 10/4250 »Sector 3-4: 11/4250 »Sector 5-6: 3/4250 »Sector 6-7: 6/4250

MAC No.19, June 2006GR, AT-ACR14 QRL installation status Heat inleaks [W] E+F (50-75 K) B+C+D (4-20 K) Calculated Measured /- 400 (~ 2.8 W/m) 634 +/- 50 (~0.2 W/m) Sector 8-1: - installation completed - pressure, leak and cold tests successfully performed

MAC No.19, June 2006GR, AT-ACR15 QRL installation status Sector 4-5: - installation completed - pressure and leak test without the JR successfully performed - JR and sub-sector A pressure tested in parallel with the magnets

MAC No.19, June 2006GR, AT-ACR16 QRL installation status Sector 3-4: - installation completed - pressure and leak test successfully performed - repair of an external leak in sub-sector I under way

MAC No.19, June 2006GR, AT-ACR17 QRL installation status Sector 5-6: - installation completed - pressure and leak test successfully performed

MAC No.19, June 2006GR, AT-ACR18 QRL installation status Sector 6-7: - installation completed - pressure and leak test successfully performed

MAC No.19, June 2006GR, AT-ACR19 QRL installation status Sector 2-3: - 3 teams working in sub-sectors A to I - installation progress: 74.4 % - 3 sub-sectors under pumping

MAC No.19, June 2006GR, AT-ACR20 QRL installation status Sector 1-2: - 3 teams working in sub-sectors E to H - installation progress: 11.7 %

MAC No.19, June 2006GR, AT-ACR21 QRL schedule

MAC No.19, June 2006GR, AT-ACR22 QRL dashboard Total to be installed contract

MAC No.19, June 2006GR, AT-ACR23 Conclusions Fabrication »Production of pipe elements, fixed points and service modules under completion »Production of steps/elbows foreseen to be completed in CW30 (compatible with installation schedule) Installation »Installation of the last two sectors under way Thermo-mechanical validation »Sectors 8-1, 4-5, 3-4, 5-6 and 6-7 (and 7-8 sub-sectors A and B) successfully leak and pressure tested »Sector 8-1 (and 7-8 sub-sectors A and B) successfully cold tested Schedule »At present installation is about 2.5 weeks in advance (schedule revised in November 2005)