Third LHC Splices Review Production Readiness Review Introduction Why this 3 rd review ? Planning, committee, mandate Evolutions since last review: SMACC project TF reactivated Questions to the reviewers Main splices Singularities Organisation CSCM Follow-up of actions Programme of the review 12th of November 2012 Third LHC Splice Review 1/18 J.Ph. Tock

Third LHC Splices Review Why this ? 12th of November 2012 Third LHC Splice Review Review 1 to assess: the design for the consolidation of the main 13 kA interconnection splices the plans for the work organization, quality control, resources, schedules the status and risk analysis of all superconducting splices in LHC. Review 2 to assess: the final design for the consolidation of the main 13 kA interconnection splices the status and risk analysis of all superconducting splices in LHC the quality control procedures and plans the update of the plans for the work organization, quality control, resources, schedules October 2010 Report form the first LHC Splices Review: “Although the design is well beyond the conceptual stage, it is not yet a final design, and this review cannot be considered a final design review. Therefore, although the conceptual design appears to be good, the committee cannot fully assess the soundness of the design until it is final. Another review, when the design is final, or nearly so, may be advised.” November 2011 Report form the second LHC Splices Review: “The Task Force has made substantial progress in developing designs for repairing the main 13 kA bus splices, in planning for the long shutdown…and in assessing other risks that could compromise the integrity of any of the many superconducting circuits in the LHC.. The main features of the dipole bus are a double shunt and an insulating cover. The design of the shunts and the techniques for soldering them across the joints are well done and have been fully tested under an array of conditions. This appears to meet all requirements. 2/18 J.Ph. Tock

Third LHC Splices Review Why this ? 12th of November 2012 Third LHC Splice Review Report form the second LHC Splices Review: “The insulating cover design is still evolving…This is a clever design which provides the required functionality in the presence of non-negligible splice-to-splice dimensional variations. However, the precise implementation of this scheme still needs to be developed… the design of this crucial element is not yet final, and we are unable to determine that it meets the requirements.” “At the first review, we recommended that a double shunt be applied to the quadrupole bus.The Task Force has tried a number of possible ways of implementing this recommendation, but has not found any that are satisfactory. However, there have been several other mitigations, which if properly implemented would tend to reduce the risk to the quadrupole bus splices. These include a plan to reduce the dump time constant from 37 sec to 20 sec, a better defined set of criteria for deciding which joints need to be remade before applying the shunt, and the development of what we hope will turn out to be an insulating box that provides robust mechanical support which will limit the stresses in the soldered joints. We believe that if all three of these are fully implemented, then the single shunt design would represent a reasonable level of risk relative to other scenarios..” “A task force has performed a comprehensive survey/screening of all superconducting circuits in the LHC… recommendations have been presented, and most are being acted upon…it will be equally important for CERN to apply the resources necessary to address the recommendations in a timely fashion...” “It has just been decided that the 13 kA splices inside all of the DFBAs shall also be repaired… The design work has not begun yet, and therefore we cannot comment…” “… although the overall planning looks reasonable, many of the details still need to be filled in…” 3/18 J.Ph. Tock

Third LHC Splices Review Planning and committee 12th of November 2012 Third LHC Splice Review Review 3 to assess: the readiness for the shutdown intervention: specifications, procedures, quality control methodologies, qualifications, resources, schedule the remaining pending design issues Was planned for August/September 2012 In July 2012, the CERN management has decided to postpone the start of LS1 by about three months, for a variety of scientific and technical reasons. Review 4 to perform a Quality Audit to assess (R Ostojic): whether the status of LHC corresponds to what was expected if implementation actions correspond to the plan November 2012 June/ July 2013 Some changes in the review committee:  G Ganetis and C Hauviller could not attend the analysis  H Pfeffer can only attend part of it  A Poncet (CERN) is joining the committee  H Ten Kate is joining the committee for the CSCM session The Review committee: (George Ganetis / BNL) Chen-yu Gung : ITER Toru Ogitsu / KEK Howard Pfeffer / Fermilab (Part) Alain Poncet / CERN Jim Strait / Fermilab : Chairperson Pierre Vedrine / CEA Saclay 4/18 J.Ph. Tock

12th of November 2012 Third LHC Splice Review General mandate To review CERN’s plans and consolidation actions concerning the superconducting splices in the LHC machine for 7 TeV operation Specifically:  To work in close liaison with the CERN Splices Task Force,  To consider all splices over complete circuits, within and between equipment.  To ensure “best practice” knowledge existing in world Laboratories and Industries has been duly considered.  To ensure that an integrated, systems approach is being followed, covering both electrical and mechanical issues, neighboring systems, operations, … 5/18 J.Ph. Tock Third LHC Splices Review Production Readiness Review

SMACC 12th of November 2012 Third LHC Splice Review Evolution towards start of intervention in LHC 6/18 J.Ph. Tock Third LHC Splices Review Production Readiness Review AnalysisDecisionDesignValidationPreparationIntervention PRR November 2012 FDR DFBA 13kA splices Quad Diodes Connection Spiders, Lyras insulation Arc 13kA splices ? April months 5 months : are we on good tracks ?

12th of November 2012 Third LHC Splice Review SMACC Superconducting Magnet And Circuits Consolidation To differentiate from LS1 (Long ShutDown 1) that is Not a project, but a time-frame (Feb-2013 to Dec-2014) Numerous projects and activities:  SMACC (Superconducting Magnets And Circuits Consolidation)  R2E (Radiation to Electronics)  Massive shutdown maintenance after more than 3 years of operation  Several major consolidations  A lot of projects (Linac 4, HIE-Isolde, Elena, LIU, HL-LHC, 107, ….) 7/18 J.Ph. Tock WHY ?

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12th of November 2012 Third LHC Splice Review SMACC meetings (1 st on 1 st of March 2012) Superconducting Magnet And Circuits Consolidation Before: Prepare the consolidation of the SC magnets and circuits During: Ensure best progress, manage unexpected, prioritize, improve After: Support restart of LHC, lessons learnt, inputs for LS2  Interfaces between main activities  Interfaces with the other LS1 activities (R2E, injectors, cryo consolidation, infrastructure, ….)  Safety issues (Radioprotection, general safety,..)  Resources status (Staff, budget,…)  Planning  Common logistics and infrastructure issues  Evaluate impact of large modifications  Ready for a PRR in Aug/Sep 2012 – November meetings so far … 9/18 J.Ph. Tock

12th of November 2012 Third LHC Splice Review Splices TF revived  Shortening the long RQF/RQD busbar segments in points 1 and 5 : Later today  DFBA consolidation : Later today  Reinforcement of spider insulation : Tomorrow in open actions from last review  Splices inspection method and acceptance criteria : Later today  New configuration for rewelding : Tomorrow  LHC splices review 3 : Preparation, debriefing and follow-up of actions from this review  Follow-up of recommendations from the screening exercise 8 meetings in 2012 so far 10/18 J.Ph. Tock TECHNICAL SUBJECTS

12th of November 2012 Third LHC Splice Review Consolidation of the main splices (Shunt and electrical insulation) Is everything ready (or planned to be) to carry out the consolidation of the 13kA splices? Both from production and QA points of view - Design finalised - Tooling, Procedures - Corrective / Complementary actions recommended at the last reviews - Planning - Resources - Safety - Training What can be improved ? Have all aspects been covered ? Is the plan towards the start of intervention realistic ? Specific points  Are the conditions related to the use of a single shunt for the quadrupole bus satisfactorily met ?  Do you recommend to proceed to the shortening the long RQF/RQD busbar segments in points 1 and 5 ?  Does the DFBA consolidation meets the same requirements as the other 13kA splices ? Will the same level of reliability be reached ? Is the plan towards the start of intervention realistic?  Will the action plan for the consolidation of the diodes give the same level of safety as the other electrical joints ? Is the plan towards the start of intervention realistic? Specific questions to reviewers (1/2) Third LHC Splices Review 11/18 J.Ph. Tock

12th of November 2012 Third LHC Splice Review Organisation Is the integration and schedule of the other activities optimised wrt the main train of work ? - Special interventions - Safety relief devices (DN200) - Opening and closure of the interconnections - Welding - Leak tests - Beam vacuum QC What can be improved ? Comment on the WISh tool. Are planned resources adequate ? Is there enough contingency ? CSCM Is the CSCM needed for operating the LHC at 7 TeV per beam? Are the proposed CSCM tests for qualifying the bus-bars after the LHC consolidation adequate? Are the proposed CSCM tests for qualifying the bypass diode lead connections adequate? Is the CSCM implementation realistic? Is the proposed circuit protection system against runaway and other events which can damage the machine sufficient components sufficient ? What can go wrong and is not taken into account yet ? Do we have any showstopper for the type test ? Did we forget something ? Is the proposed schedule at the end of LS1 realistic? If the type test at the beginning of LS1 is done at reduced current, can it be extrapolated to nominal current ? Do you recommend a decision point after the type test ? Specific questions to reviewers (2/2) Third LHC Splices Review 12/18 J.Ph. Tock Review II: 7 II.2.3 p5/11 : Consider the utility and practicality of utilizing the CSCM for periodic “requalification” tests of the main (quadrupole) bus circuits.

12th of November 2012 Third LHC Splice Review  Have the recommendations from last reviews been correctly implemented and followed-up? Where should priority be put in the next months?  Do you have proposals for improvements/exploration [Technical, management] that can fit in the present scheme?  The LS1 starts mid-February 2013 with the opening of the first interconnection mid of April 2013 so in 5 months  Available time and resources are limited  Do not hesitate to ask for clarifications, demonstrations Follow-up / Boundary conditions Third LHC Splices Review 13/18 J.Ph. Tock

12th of November 2012 Third LHC Splice Review Monday 12 th of November: Consolidation of the superconducting splices and circuits : Production and QA including singularities Visit to Hall 180 after the review Tuesday 13 th of November: Other necessary activities Organisation, resources, schedule Review of actions for last review and circuits screening Diodes status Possible extra presentations Wednesday 14 th of November: Workshop audits // CSCM session Closed session Preliminary conclusions Programme of the review (1/4) Third LHC Splices Review 14/18 J.Ph. Tock

Third LHC Splice Review 12th of November 2012 Programme of the review (2/4) Third LHC Splices Review 15/18 J.Ph. Tock

12th of November 2012 Third LHC Splice Review Programme of the review (3/4) Third LHC Splices Review 16/18 J.Ph. Tock

12th of November 2012 Third LHC Splice Review Programme of the review (4/4) Third LHC Splices Review 17/18 J.Ph. Tock

12th of November 2012 Third LHC Splice Review  Thank you for accepting this charge and being here  We are here to answer your questions  The two first reviews were very useful,…. Third LHC Splices Review 18/18 J.Ph. Tock

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