MATTEO SOLFAROLI and MIRKO POJER HARDWARE COMMISSIONING DURING

MATTEO SOLFAROLI and MIRKO POJER HARDWARE COMMISSIONING DURING WINTER TECHNICAL STOP Acknowledgements: R. Schmidt, M. Zerlauth, H. Thiesen, N. Catalan, K. Foraz, R. Giachino

CRYO-INTERVENTION PLANNING 10/15/2021 Mirko Pojer – LHCBCWG 2

POWERING TEST PLANNING S 12 2 shifts 5/7 days for access S 34 S 45 S 56 S 67 S 78 S 81 1 18 CRYO MAINTAIN 1 ELQA 19 1 1 20 1 1 21 1 1 MIC 1 POWERING 1 22 23 24 1 25 1 1 1 26 1 27 1 1 1 28 1 1 1 Chamonix January Chamonix: No shifts (Access covered by TI? ) S 23 17 29 30 3 shifts 7/7 days 31 1 1 2 1 3 4 1 1 1 5 6 7 8 February 9 10 11 12 13 DSO tests 14 15 16 17 18 20 21 10/15/2021 BEAM OPERATION Mirko Pojer – LHCBCWG 3

GENERAL LAYOUT PC condemnation El. QA monitoring of multi-k. A circuits and spool pieces RRR measurements during warm-up/cool-down El. QA after re-cooldown PC de-condemnation QPS-IST with selective quench heater firing (only where disconnected) • Powering tests (special tests on RB. A 56 to validate simulations) • Heat runs and GPM test • • Cycling, cycling…. 10/15/2021 Mirko Pojer – LHCBCWG 4

KEY-DRIVERS FOR ELQA • It was decided to perform the electrical integrity validation only on high current circuits, despite thermal excursions • The MSs and ITs will certainly go (far) above 80 K → full El. QA • MIC will be done on MSs and ITs The El. QA team and equipment: • Equipment for testing up to 4 sectors in parallel • 5 teams available inside the El. QA team (2 teams per sector + 1 (per MIC) needed) –> up to 2 sectors in parallel 10/15/2021 Mirko Pojer – LHCBCWG 5

POWERING TEST STREAMLINING Circuit type PIC 2 RB (8) Estimation ~30 min ~10 min ~15 min ~35 min ~15 min 600 A no IT PNO. b 2 Energy Extraction from QPSat. Bipolar PNO. d 3 Powering EE crow PNO. d 12 PC Failure +10% of PNO~30 min ~10 min ~20 min PIC 2 PLI 3. d 2 Unipolar. PIC 2 Powering Failure ~10 min ~15 min Failure 600 A (136) PNO. d 13 PC Failure at -10% of PNO ~30 min (per ~10 min circuit) PIC 2 ~2 min PIC 2 ~15 min 80 – 120 A IPD PLI 2. b 3 Energy Extraction from QPS 13 k. A ~20 min PNO. d 1 Bipolar Powering PNO. c 2 Fast Power Abort IPD (284) (16) Failure PNO. b 3 Energy Extraction from QPS 13 k. A ~30 min PIC 2 PNO. d 1 Bipolar Powering PLI 3. b 1 Energy Extraction from QPS 600 A Failure 600 A EE (202) 600 A no EE (72) 60 A (752) ~10 min ~20 min ~10 min ~5 min PNO. d 3 Bipolar Powering Failure 600 A ~15 min PIC 2 ~10 min PNO. d 3 Bipolar Powering Failure 600 A TOT 3/6 PIC tests 1/7 other tests (+ 4/13 other tests PNO. a 7) (+2 if 4 Te. V) 3/6 PIC tests 1/4 other tests 2/16 other tests 5/8 Estimation ~20 min PIC 2 (16) Sector PIC 2 Circuit PLI 1. d 2 Unipolar Powering Failure IPQs Sector type PNO. c 3 Fast Power Abort IPQ (78) PLI 2. b 2 Energy Extraction from QPS I_Interm_1 (8) RQD/F Test ~15 min 5/8 PIC 1/3 PIC 3/6 tests PICtests 2/12 1/4 other tests 2/4 other tests 3/6 other PIC tests 1/3 tests 2/6 other tests 3/6 PIC tests 1792/3672 PIC tests - 49% 1/4 other tests 1690/5878 other tests - 29% • Main focus on protection interlocks (QPS/EE, PIC, PC) --> Almost all tests to verify the correct operation of interlock loops will be performed • Reduced number of other tests, according to expert requirements • Heat run for all circuits will be performed (8 hours) as last step 10/15/2021 Mirko Pojer – LHCBCWG 6

POWERING PROCEDURES (MP 3) • Optimization • Modularity to be applied to all kind of situations (full commissioning, technical stop, components replacement, …) • Example: PCC. 4 PIC 2 PLI 1 PLI 2. f 3 PLI 2. c 3 PNO. c 2 PNO. f 3 PNO. c 4 Intervention Change of a magnet Re-work of the interconnection Warm up above 80 K Change of power module Change of FGC software Change of QPS hardware QPS firmware update Regular interventions (1 x year) Courtesy of N. Catalan 10/15/2021 Mirko Pojer – LHCBCWG 7

CIRCUIT SPECIFICITIES AND NCS List of non-conformities and powering singularities • – – – – RQTD and RQTF validation time extended to 190 ms, can it remain for 4 Te. V? RQS validation time extended to 190 ms, can it remain for 4 Te. V? Higher order correctors in triplet? for higher E, lower beta? RU RCBX, limited to 350 A due to difficulties to make the interlock on the square sum operating, issue with d. I/dt RPMBA. UA 83. RQT 13. L 8 B 1 RPMBA. UA 27. RQTL 11. R 2 B 1 RQS. A 45 B 1 and RQS. A 45 B 2 have a high value Large part of 600 A circuits were commissioned to the value required for 5 Te. V A few circuits have some issues, and were operated at lower current The IPQ and IPD circuits were limited to 3. 5 Te. V because of the missing splice resistance measurements RB. A 81 d. I/dt needs to be set correctly RQ 6 – RQ 10. R 6 parameters HW limit set differently RCBYHS 5. R 8 B 1 has an issue and is limited to 20 A RQX. R 1: QHPS voltage reduction and capacitance increase • • Re-visiting and taking a critical look (new current limits for 4/5 Te. V operation) 10/15/2021 Mirko Pojer – LHCBCWG 8

RESOURCES • 2 -3 weeks with 24/7: can the experts operate like that? – – – 10/15/2021 EPC will provide full support PIC will be on best effort (most is automated) QPS will mainly be on extended working hours MP 3 on full time (to be confirmed) OP is already organizing the shifts Mirko Pojer – LHCBCWG 9

WHAT LMC HAS RECENTLY ENDORSED • Installation of the snubber-capacitors on DQS for the dipole circuits – Discussion ongoing about their connection (to be tested for one sector, to be decided for the others) – Experts says they are needed for 4 Te. V operation – Not needed for the RQD/F Energy change and snubbers → extraction time to be increased to 68 s (12. 5 s for the RQs) • Upgrade of all IPQ’s and IPD’s for 10 V input and 500 Hz PM acquisition frequency • Decommissioning of the existing main bus-bar protection systems and respective reconfiguration of the main circuit protection. • Various software upgrades for the DQGPU’s • RRR measurements 10/15/2021 Courtesy of K. Foraz Mirko Pojer – LHCBCWG 10

SAFETY-RELATED ASPECTS 10/15/2021 Mirko Pojer – LHCBCWG 11

AUG AND TRANSFORMERS REPLACEMENT AUG tests Point 1 : Sunday 19 th December Point 18: Wednesday 5 th January Point 2: Thursday 20 th January Point 3: Wednesday 8 th December Point 4: Thursday 6 th January Point 5: Tuesday 4 th January Point 6: Monday 10 th January Point 7: Tuesday 11 th January Point 8: Monday 20 th December – No access from point 1 to mid-arcs – No access in PM 18, UJ 18 – No access from point 2 to mid-arcs – No access from point 3 to mid-arcs – No access from point 5 to mid-arcs – No access from point 6 to mid-arcs – No access from point 7 to mid-arcs – No access from point 8 to mid-arcs Stop of ventilation in the arcs (transformer exchange) Arc 34 and arc 45: From Monday 17 th January to Friday 21 st January Arc 56 and arc 67: From Tuesday 11 th January to Friday 15 st January 10/15/2021 Mirko Pojer – LHCBCWG 12

WORK ACCEPTANCE TOOL Virtually, no more need for access operators Courtesy of K. Foraz 10/15/2021 Mirko Pojer – LHCBCWG 13

BEYOND HWC S 12 S 23 S 34 S 45 S 56 17 S 67 S 78 S 81 1 18 CRYO MAINTAIN 1 ELQA 19 1 1 20 1 1 21 1 1 MIC 1 POWERING 1 23 24 1 25 1 1 1 26 1 27 1 1 1 28 1 1 1 Chamonix January 22 29 30 31 1 1 2 1 3 4 1 1 1 5 6 7 8 February 9 10 11 12 13 DSO tests 14 15 16 Machine check-out 17 18 20 21 10/15/2021 BEAM OPERATION Mirko Pojer – LHCBCWG BIS RF LBDS MKI/injection/TLs Collimators BI instrumentation Controls 14

CONCLUDING REMARKS • Tough planning (profitez bien des vacances!) • HC team is working on all test-related aspects: – – – Powering test streamlining Powering procedures (MP 3) NCs Implications of energy increase Almost regular meetings with experts • Safety aspects are being considered • WAT will keep people away from the access consoles • Tracking of performed activity in the tunnel is the key for a fast restart • Machine check-out can start after the DSO tests 10/15/2021 Mirko Pojer – LHCBCWG 15