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LHC Commissioning Working Group 2006

LHC Commissioning Working Group 2006. Presented to LTC in November and MAC in December. 20th meeting of the LHC MAC (7-9 December 2006). Executive summary … Beam Commissioning Plans

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LHC Commissioning Working Group 2006

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

  2. 20th 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 2008. 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 2007

  3. 2007 - 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 • 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 • 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 • Restart interconnection and installation activities this week • Completion of repair of triplet 5L in time for pressure test and cooldown of Sector 4-5. • Consequence • Sector 8-1 will be cooled down and commissioned after 4-5 • Sector 8-1 will be commissioned only to 450GeV in 2007 • Planning will have to change • 450GeV run still the target • Hardware commissioning to high energy in 2008 will take longer R.Bailey, LHCCWG, January 2007

  4. 2007 - QD circuit • RAT (Réunion Avancement Travaux) point 8, January 26th • 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 29th • 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 2007

  5. 2007 - Committees ICC • Starts Feb 2nd • Every 2 weeks • Lyn as Chair • Roberto (DC) • Roger (SS) LTC • Steve plans to focus LTC on LHC beam commissioning • 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

  6. So what should we do in 2007? R.Bailey, LHCCWG, January 2007

  7. R.Bailey, LHCCWG, January 2007

  8. Meetings Q1 • Aim for meetings every 2 weeks as before • Interleaved with LTC (proposed dates may have to change slightly) R.Bailey, LHCCWG, January 2007

  9. Meetings Q2 • To be scheduled sometime • 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 commissioning experience (CNGS, LSS6, LSS4/6 extraction) (Brennan) R.Bailey, LHCCWG, January 2007

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