MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE ELQA during LS1 train, Special measurements and NCs Magnet replacement: AIV Splices consolidations: PAQ_LS1 Non Conformities 1

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE 2 Arc Interconnection Verification: magnet replacement What is A.I.V. ? Why is it needed? How is it performed? When is it performed? ELQA resources estimated? Safety issues

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE 3 Arc Interconnection Verification: magnet replacement What is A.I.V. ? o It is a test that verifies the continuity and polarity of the ARC and DS superconducting circuits during the assembly phase of the machine. o The Line N circuits and the Spools circuits are checked. o HVQN is part of AIV. It verifies the electrical continuity and High Voltage insulation (1000V) of the Line N: After removal After transport, before reinstallation, laying down After re-insertion, before connection

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE 4 Arc Interconnection Verification: magnet replacement How is AIV performed? AIV is performed in two steps AIV1 (Line N inserted before US welding) and AIV2 (Line N US welded). The continuity of a circuit is checked by sensing a current at both sourcing and sinking ends. The polarity and the type of the connected magnet are checked by measuring the expected voltage between the magnet voltage tap i.e. the port A and the sinking end

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE 5 Arc Interconnection Verification: magnet replacement When is it performed?  During LS1, AIV must be performed whenever a magnet is being replaced: 19 magnets ! A.I.V activity start in June 2013 and finish October 2013

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE 6 Arc Interconnection Verification: magnet replacement ELQA - AIV resources? o Hardware: we have 2 AIV measuring systems available. One system is needed per AIV test. o Test duration: once the measuring system is installed on place (need Pefra to transport it), the test duration is about 2 hours / AIV test. o Manpower planed: 1 team of 3 persons from HNINP, can be doubled if needed.

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE 7 Arc Interconnection Verification: magnet replacement ELQA - AIV resources? o Manpower : we should be able to cope our needs with the collaboration from HNINP and the CERN staff from EE section. o Software: AIV is based on a Labview program, already used during machine assembly (WinXP). We will not invest resources to update the program.

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE 8 Arc Interconnection Verification: magnet replacement Safety issue? o The area under test is patrolled by the ELQA team before starting the test. o One person has to be present at each extremity of the test area during all the time when the high voltage is applied. o Habilitation éléctrique B1 o Standard safety course to access the tunnel o Safety equipment to access the tunnel: helmet, front light, safety shoes, bio-cell, jacket…

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE 9 Partial Assembly Qualification during LS1: “train” follow-up What is PAQ during LS1 ? What are the requirements? Duration for PAQ test? PAQ resources? PAQ safety issue?

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE 10 What is PAQ during LS1 What is Partial Assembly Qualification for LS1 ? o Initially used during LHC assembly, the procedure is adapted for LS1 condition: segment length is the whole sector! o The PAQ test consists of two steps of verifications: Electrical continuity verification of spool-pieces circuits (M1 and M2 lines). High Voltage qualification on RB (in M3 line), RQD, RQF and Spool-pieces circuits, (M1 and M2 lines).

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE 11 PAQ configuration during LS1 o Configuration of a sector during consolidation: All busbars must be kept insulated from each other and from ground at each level of the consolidation work. This is the duty of the consolidation work teams.

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE 12 PAQ requirements during LS1 What are the requirements from ELQA for PAQ during LS1 «train» follow-up ? o DC warm cables must be disconnected from the current leads, the instrumentation cables as well (ELQA team, already done during TP4 campaign) o Before starting the consolidation of a sector, the insulation must be removed from RB, RQD, RQF and the spool circuits open at one interconnection on the odd point  TE/MSC-LMF o These conditions must be kept during the whole period of splices consolidation in the sector. o Preparation work for PAQ test will start before 17:00. At 17:00 (5PM), the consolidation work, including QC must be completed. The patrol will start at 5PM. During High Voltage test, no personnel but ELQA team must stay in the ARC (safety condition).

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE 13 PAQ: How long does it last? When is it performed?  During LS1, PAQ must be performed during the whole period of splice consolidation, daily basis, from 5PM! PAQ activity start in May 2013 and finish April 2014

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE 14 PAQ resources during LS1 ELQA resources? o Hardware: we will have up to 8 TP4 measuring systems. One system is needed per PAQ test. o Test duration: once the measuring system is installed on place (need Pefra to transport it), the test duration is about 1.5 hours / PAQ test, without any fault ! o Manpower: 2 teams of 3 persons (HNINP) + CERN Staff o Software: use TP4 software (HNINP+ M.B.) and signature WISH tool (SMACC)

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE 15 PAQ safety issues during LS1 For safety issue o Put the blinking warning lights on both extremities of the part of the subsector under test. Lamps should be placed in a visible position on the floor. o The area under test is patrolled by the ELQA team before starting the test to ensure that no one is in the subsector under test o One person has to be present at each extremity of examined length during all the time when the high voltage is applied. o During the patrol, verify that the segment under test is insulated from anything else (visual inspection). o Habilitation éléctrique B1 o Standard safety course to access the tunnel o Safety equipment to access the tunnel: helmet, front light, safety shoes, bio-cell, jacket… o Will finish “late at night”. Cars are foreseen for teams in the tunnel!

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE List of pending ELQA NCs 15 NCs are “initiated” or “ Under way” status:

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE High Voltage withstand issue, solved with new ELQA procedure HV issue between RCBCH6.L2B2 and RCO.A12.B2: condemned PC side Related to RCO.A12.B2 here above, no powering limitation Circuits found open in the cold part. Circuits are condemned! Pending ELQA NCs affecting powering in S12

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE H.F. QH issue, magnet will be replaced during LS1. Warm temp sensor of C.L. is swapped. Temporarily corrected. Final correction during LS1. Vtap of C.L. lost on Nov Cable segment replaced as precaution. Pending ELQA NCs affecting powering in S2-3; 3-4; 4-5, 5-6: 6-7

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE 120A corrector of Q5L8 replaced by warm magnet. Initial corrector condemned. Q5L8 will be replaced during LS1 60A corrector of Q31.R7 too resistive in the cold part. Circuit is not mandatory, and condemned. Magnet B30R7 (MBBR1007) has HV vs GND issue (1.6kV instead of 1.9kV). Satisfactory for 4TeV equivalent current. Magnet will be replaced during LS1 Magnet B30R7 (MBBR1007) has HV vs GND issue (1.6kV instead of 1.9kV). Satisfactory for 4TeV equivalent current. Magnet will be replaced during LS1 Spurious lost of cold temperature reading. Stable since September Pending ELQA NCs affecting powering in S78

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE 120A corrector of IT.L1: Circuit found open in the cold part. Circuit is condemned! RCO.A81.B2 is open in the cold part. Diagnostic performed on March 2009 shows that this circuit is open between position B12L1 and B11L1. The circuit is condemned and will be repaired during LS1 Pending ELQA NCs affecting powering in 8-1

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE Quench Heaters issues, already mentioned above. Those magnets will be replaced during LS1 RCO.A78B2: Low quench performance: The circuit "quenched" always (three times) while ramping up the current starting from 55 A (so not on flat top as in some comments). It may be in a magnet or in the busbar. Splice issue?? To be diagnosed. Other NCs reported by MP3 with ELQA actions:

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE Summary of NCs limiting powering before LS1 CircuitMagnetProblemInputEDMSSectorTo be changed RemarksLimitation? RQX.R1LQXAA.1R1 QH insulation to GND ELQA No Magnet protection revised for 7TeV, new parameters ! NO RCO.A12B2 H.V. insulation vs RCBCH6.L2B2 ELQA No Consolidation during LS1 YES RCBCH6.L2B2 H.V. insulation vs RCO.A12B2 ELQA No Consolidation during LS1 NO RCOX3.L2 Open circuit in cold part ELQA NoNeeded for 7TeV?YES RCOSX3.L2 Open circuit in cold part ELQA NoNeeded for 7TeV?YES RCSSX3.L2 Open circuit in cold part ELQA NoNeeded for 7TeV?YES RCBCH5.L8B1 Current lead too resistive ELQA YesNew Q5L8YES RCBH31.R7B1 Cold part too resistive ELQA Yes Circuit condemned, Not needed for 7TeV YES RCO.A78B2 Cold part too resistive MP YesTO BE INVESTIGATED RCOSX3.L1 Open circuit in cold part ELQA NoNeeded for 7TeV?YES RCO.A81B2MB.B12L1 Open circuit in cold part, between B12L1 and B11L1 ELQA No Consolidation during LS1 YES List of pending ELQA NCs

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE 23 NCs treatment resources… ELQA NCs - resources? o Manpower: ELQA CERN Staff + Help from HNINP collaborator ELQA NCs - When? o During powering test phase, before “Standard ELQA campaign”: February 11 th to 27 th 2013

MPE Workshop for LS1 / 22 & 23 Nov. 2012, G. D’Angelo TE/MPE-EE 24 Thank you!