Brief report of the hardware commissioning activities Roberto Saban on behalf of the Hardware Commissioning Teams in the AT,AB & TS Departments Short Circuit Tests Commissioning of machine systems in the Long Straight Sections Commissioning of Sector 78 Preparation for Commissioning for the other sectors Deployement and Resources Notable events Sct : difficult start, now routine, mastered by many LSS : mostly carried-out by equipment groups (RF, injection, etc) but warm magnets Preparation : a lot learnt from 78, being applied to 45, 81 & 34 The sc magnet commissioning would be the most difficult, dense and delicate

official schedule

major events & timeline Stable cryogenic conditions @ 2K Average magnet temperature in Sector 78 Simulated

major events & timeline Simulated Longer filling time, interruptions of utility systems, difficulties with the tuning of the pumping group, swap of the cryoplant & DFB commissioning Stable cryogenic conditions @ 2K Average magnet temperature in Sector 78 First time Huge cryoplant, novel techniques on real load Several large components never even cooled down A lot of experience gained which will profit in the coming sectors

major events & timeline Verification of the Voltage Taps on the HTS CL Longer filling time, interruptions of utility systems, difficulties with the tuning of the pumping group, swap of the cryoplant & DFB commissioning Stable cryogenic conditions @ 2K Average magnet temperature in Sector 78

major events & timeline ElQA @ 80K Verification of the Voltage Taps on the HTS CL Filling of the arc magnet coldmasses Swap of cryoplant and tuning First superfluid helium in the arc Stable cryogenic conditions @ 2K DFBs cleared for operation with current 4.5K Magnet & associated DFBs full with liquid Average magnet temperature in Sector 78

major events & timeline Swap of cryoplant and tuning First superfluid helium in the arc Stable cryogenic conditions @ 2K DFBs cleared for operation with current Average magnet temperature in Sector 78

non conformities Voltage tap of QF Intermittent fault on QD Presence of a few SSS with known bus-bar non-conformity Presence of a « Bad » dipole Doubts about the quality of some interconnects

Circuits powered from the powering areas via DFBs Circuit Type Sector LHC 1-2 2-3 3-4 4-5 5-6 6-7 7-8 8-1 13 kA 3 24 Indipendently Powered Dipoles 2 1 16 Indipendently Powered Quadrupoles 14 7 6 13 12 5 78 600A with Energy Extraction 23 27 28 202 600A Energy Extraction in Converter 20 136 600A no Energy Extraction 9 72 80-120A Correctors 50 37 22 33 284 TOTAL 123 105 83 99 95 79 812 Limited Current: RB (2 kA), RQF (6.5 kA), RQD (350 A) 3 Only RD2, Inner triplet dipole not available 1 Only RQ4 and RQ5 2 14 Line-N Circuits, 3 spool piece correctors & 2 MQTLH 19 Three Line-N Circuits RCO and inner triplet correctors not available Q4 and Q5 available correctors 7 Minimum Total Required 35 Voltage tap of QF Intermittent fault on QD Presence of a few SSS with known bus-bar non-conformity Presence of a« Bad » dipole Doubts about the quality of some interconnects Circuits powered from the arc Circuit Type Sector LHC 1-2 2-3 3-4 4-5 5-6 6-7 7-8 8-1 60A Closed Orbit Correctors 94 752 4 5/7/2019 Roberto Saban

commissioning of circuits First superfluid helium in the arc Stable cryogenic conditions @ 2K DFBs cleared for operation with current 4.5K Magnet & associated DFBs full with liquid Average magnet temperature in Sector 78 ElQA & Powering of four 60A circuits

commissioning of circuits First superfluid helium in the arc Stable cryogenic conditions @ 2K DFBs cleared for operation with current 4.5K Magnet & associated DFBs full with liquid Average magnet temperature in Sector 78 DFB commissioning ElQA & Powering of all the circuits in the matching section left of Point 8 All powered to nominal current

commissioning of circuits First superfluid helium in the arc Stable cryogenic conditions @ 2K DFBs cleared for operation with current 4.5K Magnet & associated DFBs full with liquid Average magnet temperature in Sector 78 ElQA of the arc magnets

Electrical Quality Must further investigate the design of the electronics for the cryogenic instrumentation

progress DFBs cleared for operation with current Stable cryogenic conditions @ 2K

notable events: coupling between Q4 and D2 After the separate commissioning of all the matchings section magnets at operating at 4.5K, the magnets were powered in unison varying the current in one of the magnets (Q4) while the other (D2) was sitting at nominal current. A coupling between the two circuits was observed, since D2 quenched. The experiment was repeated and gave consistently the same result. The probable cause is a cold cabling non-conformity:

notable events: coupling between Q4 and D2

notable events: insulation fault in the dipole circuit QPS DFBAN DFBAO MBB MBA Time of flight measurement along the transmission line

sector 78 is closed Access control point Locked door allowing escape

Hardware Commissioning organization 16.30 7.00 15.00 22.00 morning shift 8.30 afternoon shift HCC EIC PIC POC MELC MPP CPP ACR VAC CV EL Soft Hardware Commissioning Coordination Meeting

on call outside normal working hours the CCC & the field HCC EIC OP FCR Point8 or CCC 2 shifts POT POI QPS EE QPS EE PIC Cryo the field Equipment owners on call outside normal working hours on-call during normal working hours good will outside normal working hours HCC MPP Mr Circuit CPP EL CV MEL-CF POE QPS/EE CO PIC MEL-CF VAC ACR

the actors Cryogenics DFBs Electrical Quality Assurance Quench Protection Power Converters Magnet constructors Interlocks Energy Extraction Controls Glued together by Hardware Commissioning Coordination and the Operation Group

the tools targeted diagnostic instrumentation automated test program sequencing performant diagnostic tools logging system monitoring web pages post mortem & analysis tool collaborative tools logbook twiki mtf

What can slow us down? Non-conformities observed during ELQA The commissioning the cryogenic system and DFBs The commissioning the DFBs with current Time for fixing issues, such as condensation on the DFBs, on current leads, … Time for quenching magnets Time for cool down after a quench The availability of the cryogenic system The availability of utilities (water, electricity, computer network) Unexpected/training quenches Data analysis of unexpected events 5/7/2019 Roberto Saban

… in summary sector 78 is far from being commissioned what is commissioned however is: operating mode automate sequencing of tests diagnostic tools test data recording tools quality assurance and progress follow up above all, the team is built and is performing well