R.Bailey, LHCCWG, January 2007 LHC Commissioning Working Group 2006 Presented to LTC in November and MAC in December Presented to LTC in November and MAC in December

R.Bailey, LHCCWG, January th meeting of the LHC MAC (7-9 December 2006) Executive summary … Beam Commissioning Plans We are pleased to see the thoroughness of the work of the LHC Commissioning Working Group, LHCCWG, in laying plans for commissioning of the LHC. The general strategy for the initial 2007 run at 450 GeV is sound. The expressed goals are appropriate. The MAC urges the leadership of the laboratory to give high priority to completion of the thorough and systematic investigation of beam and system behavior before beginning the shutdown for hardware commissioning to high energy operation. This may well mean extending the run into We urge particularly that careful study of beam capture and stabilization during ramping to some modest energy above 450 GeV be carried out before the shutdown to investigate snapback effects. Initial experience with the collimator system adjustment will also be valuable. Wide experience shows that from such systematic studies many things will be learned about controlling the machine properly. Further, inadequacies and important but unanticipated malfunctions will be revealed so that they may be rectified during the shutdown. …

R.Bailey, LHCCWG, January Triplets During the pressure test of Sector 8-1 (25th November) the heat exchanger tube in the inner triplet failed at 9 bar differential pressure During the pressure test of Sector 8-1 (25th November) the heat exchanger tube in the inner triplet failed at 9 bar differential pressure A repair procedure is being validated and will have to be implemented on all 24 quadrupoles (18 are already installed) A repair procedure is being validated and will have to be implemented on all 24 quadrupoles (18 are already installed) Baseline: Replacement and installation of new HX tubes Baseline: Replacement and installation of new HX tubes Plan B: Repair of existing tubes by inserting an HDPE/inox reinforcement in tube extremities followed by a pressure test. Plan B: Repair of existing tubes by inserting an HDPE/inox reinforcement in tube extremities followed by a pressure test. Repair performed in the tunnel without displacement of any of the installed magnets or DFBX. HX removal/insertion from open interconnects Repair performed in the tunnel without displacement of any of the installed magnets or DFBX. HX removal/insertion from open interconnects Restart interconnection and installation activities this week Restart interconnection and installation activities this week Completion of repair of triplet 5L in time for pressure test and cooldown of Sector 4-5. Completion of repair of triplet 5L in time for pressure test and cooldown of Sector 4-5. Consequence Consequence Sector 8-1 will be cooled down and commissioned after 4-5 Sector 8-1 will be cooled down and commissioned after 4-5 Sector 8-1 will be commissioned only to 450GeV in 2007 Sector 8-1 will be commissioned only to 450GeV in 2007 Planning will have to change Planning will have to change 450GeV run still the target 450GeV run still the target Hardware commissioning to high energy in 2008 will take longer Hardware commissioning to high energy in 2008 will take longer

R.Bailey, LHCCWG, January QD circuit RAT ( Réunion Avancement Travaux ) point 8, January 26 th RAT ( Réunion Avancement Travaux ) point 8, January 26 th There is a short to ground localized on the quadrupole circuit Q21L8 that is going to be detected. D.Bozzini will continue the investigation this morning. The cooldown is on standby waiting until new situation. There is a short to ground localized on the quadrupole circuit Q21L8 that is going to be detected. D.Bozzini will continue the investigation this morning. The cooldown is on standby waiting until new situation. RAT ( Réunion Avancement Travaux ) point 8, January 29 th RAT ( Réunion Avancement Travaux ) point 8, January 29 th The short to ground found last week disappeared on Saturday 27th at 3:50am. Nonetheless, it was already localized on Friday 26th to be in the interconnection between C21L8 and C22L8; the resolution of such localization is not yet sufficient to tell if it is in the interconnect or in the lyra. The short to ground found last week disappeared on Saturday 27th at 3:50am. Nonetheless, it was already localized on Friday 26th to be in the interconnection between C21L8 and C22L8; the resolution of such localization is not yet sufficient to tell if it is in the interconnect or in the lyra.

R.Bailey, LHCCWG, January Committees ICC Starts Feb 2 nd Starts Feb 2 nd Every 2 weeks Every 2 weeks Lyn as Chair Lyn as Chair Roberto (DC) Roberto (DC) Roger (SS) Roger (SS)LTC Steve plans to focus LTC on LHC beam commissioning Steve plans to focus LTC on LHC beam commissioning Role of LHCCWG may need modification Role of LHCCWG may need modification "The LHC Installation and Commissioning Committee will closely monitor, at the project management level, the final stages of installation and the intimately linked hardware and beam commissioning phases of the LHC machine. Aiming at commissioning the LHC as a team, it will co-ordinate across all departments and will have members directly involved in these activities. It will meet every fortnight on Friday mornings and, as an evolution of the TCC, will also deal with the remaining issues of planning and Engineering Change Control."

R.Bailey, LHCCWG, January 2007 So what should we do in 2007? - A - - A - Continue elaboration of commissioning plan in LHCCWG Finish run through of commissioning phases Two beam operation Details of the ramp Measurements needed at top energy Collisions at top energy Documentation and procedures Based on what we heard in 2006 Verena and EICs doing this Discussion and follow up needed Other follow up Prioritise open action list Treat high priority actions Two major axes - B - Get more involved in the Accelerator Systems side Hardware commissioning Power tests of main circuits (with HCC) Individual system tests (with HCC) Things not covered by HCC Integration into operation From IST to operation Control from the CCC Operation with beam Elaborate details of ‘Q4 2007’ Hardware commissioning Machine checkout Beam

R.Bailey, LHCCWG, January 2007 Accelerator systemsResponsibleLHCCWG Technical Services TI operations P.SollanderNot needed ControlsH.SchmicklerNot needed Electrical supply F.Rod Mateos Not needed Cooling and ventilationJ.Inigo-GolfinNot needed Access & safety systemsT.PetterssonPC Hardware Commissioning CryogenicsL.SerioGA, SR, WV Main Ring Magnets PerformanceA.SiemkoWV, MG Insertion Magnets Performance R.Ostojic WV, MG PIC B.PuccioWV, JU QPS K.H.Mess WV, JU Power convertersF.BordryWV, JU Beam Commissioning VacuumN.HilleretRA, FZ, GA Magnetic ModelJ.P.KoutchoukWV, MG, SF Machine Protection SystemsR.SchmidtJU, JW Radiation ProtectionD.ForkelWirthRA, PC Radiation monitoringT.WijnandsRA, PC Beam TransferV.MertensSee details RFT.LinnecarSee details Beam InstrumentationR.JonesSee details CollimationR.AssmannRA, SR High level controlsM.LamontSee details OperationsR.BaileySee details Accelerator physicsO.BruningSee details Experimental ConditionsH.Burkhardt

R.Bailey, LHCCWG, January 2007 #DateTopics 1January 31Summary of 2006 work and outline for 2007 (Roger) Beam measurements at 450GeV  Summary of parameter tolerances (Frank)  Proposed beam measurement program in 2007 (Frank)  What to do if we cannot get in tolerance (All) 2February 14Alternative filling schemes (Werner) Implications for the injectors (Elias) Documentation and procedures – injection and first turn 3February 28Magnetic model meeting  FiDeL (Luca)  WISE (Ezio)  LSA (Marek) Behaviour of the magnets through the squeeze (Walter) Documentation and procedures March 14OP visit to LNGS 4March 28Optics measurements needed at top energy (Frank) Collisions at top energy, luminosity determination and optimisation (Helmut) Commissioning of accelerator system - BLM (Laurette) Documentation and procedures Meetings Q1 Aim for meetings every 2 weeks as before Aim for meetings every 2 weeks as before Interleaved with LTC (proposed dates may have to change slightly) Interleaved with LTC (proposed dates may have to change slightly)

R.Bailey, LHCCWG, January 2007 #DateTopics 5April 11Beam excitation meeting  Controlled transverse blow up with pink noise (WH/MM)  Using the damper (Wolfgang)  Status of the AC dipole (Javier)  Using the AC dipole (Stephane)  Using the Aperture kickers (Frank S) Commissioning of accelerator system - Vacuum (Frank) Documentation and procedures 6April 25Details of the ramp (Mike, what’s needed here?) Commissioning of accelerator system - RF (Magali) Documentation and procedures 7May 9MAD-X online model (Frank Schmidt) Commissioning of accelerator system - Magnets (Walter) Documentation and procedures 8May 23Report from MPSC subgroup (Jan) 9June 6 10June 20 Meetings Q2 To be scheduled sometime To be scheduled sometime 2 beam operation (Jan, Ralph) 2 beam operation (Jan, Ralph) Beam losses and radiation monitoring for steering the beams in collision during the engineering run at 450GeV (and at high energy?) (Thijs) Beam losses and radiation monitoring for steering the beams in collision during the engineering run at 450GeV (and at high energy?) (Thijs) Beam commissioning experience (CNGS, LSS6, LSS4/6 extraction) (Brennan) Beam commissioning experience (CNGS, LSS6, LSS4/6 extraction) (Brennan)