Powering tests preparationmeeting 4 Mirko Pojer and Matteo

Powering tests preparation_meeting 4 Mirko Pojer and Matteo Solfaroli

Cryogenics § Boil offs and cryo-tuning should be almost completed § Cryogenics for S 12 and S 23 is in a “unusual” configuration with both sectors cooled by the unique installation of P 18 (configuration required by the intervention on the transformer at point 2) o o § § § Will need 2 days at the end of the transformer intervention to reconfigure 3. 5 additional days will be needed for the cryogenics test of “maximum heat load” in week 11 (March 14 th - 16 th) S 78 will also be tested for “maximum heat load” from March 14 th to 16 th Test to be planned: IT. R 8 “stability check” 2 days will be needed at the end to set S 23 and S 78 in Run II configuration 2/18/2021 3

Pre-powering activities 2/18/2021 4

Preliminary activities § EE insulation tests COMPLETED o § El. QA of main circuits, DSLC, RQ 6. R 7 and RQ 6. L 8, DFBLA and DFBLB COMPLETED o o § Insulation weakness on RQD. A 23 busbars was identified in “oil or some sort of lubricative stuff covering the two busbar supports” Bozhidar. After cleaning, test passed: 30 MOhms vs GND. One n. QPS card replacement Visual inspection of current lead status regarding icing and humidity Replacement of instrumentation cable on RQ 10. R 1 as precaution: bad contact detected “The 8 sectors are released from ELQA point of view. Many thanks to ELQA team and all!” Giorgio Cables reconnection o o DFB side PC side COMPLETED 2/18/2021 5

Preliminary activities II § Circuits un-grounding o § § In S 56 DFBXF. 3 R 5 and RB are condemned to pass TOTEM cable PC unlocking o ALMOST COMPLETED See next slide Commissioning of water cooling circuits o Progressing with the de-condemnation of the circuits 2/18/2021 6

Unlocking details Ø S 12 • RPLB. UL 16. RCOX 3. R 1 = VS : EXTERNAL I_EARTH OVER CURRENT : FAULT : UT: After today investigation, the Earth Fault is on the circuit side and not at the level of the converter/rack. Next step will be to perform an ELQA. RPHH. RR 17. RQ 4. R 1 B 1 = FGC Fans are not working (AC-DC OK) / OTP done - No impact on powering Change the Fan Tray • Ø Ø S 23 OK S 34 OK S 45 OK S 56 • • • RPMBB. RR 53. ROF. A 45 B 2 = I_MEAS=0 A & I_OUT=-325 A / OTP done - No impact on powering RPLB. RR 57. RCBYV 4. R 5 B 1 = I_MEAS_DIFF Warning / OTP done - No impact on powering RPHGA. RR 57. RD 2. R 5 = 2 x Output Modules Fans not working / OTP done - No impact on powering Ø S 67 • RPHGA. UJ 67. RQ 8. R 6 B 2 = 2 x Output Modules Fans not working / OTP done - No impact on powering Ø S 78 OK Ø S 81 OK In conclusion, all converters are ready for powering except RCOX 3. R 1 2/18/2021 7

UPS (powering redundancy) test All systems must be ready (live) for the day of the test in the different sectors Access will be needed for several teams to debug and fix issues If a test cannot be done, it will be moved to the end 2/18/2021 8

General news § § 3116 tests done (2775 successful) over the week-end At least one circuit of each type (but main quadrupoles) has been fully commissioned – RB. A 34 stay 4 h at I_PNO+I_DELTA PNO. d 1 automatic analysis for 120 A has to be reviewed New firmware for rad-hard 600 A boards validated…L 5 circuits show few problems: o o § § The automatic reset of the QPS agent after quench not always works When it does, the QPS-OK does not come back (manual reset needed) We need an update of the n. QPS reset macro (to reset the single crates at the end) Current detection on dump resistor of RB. A 81 and RB. A 34 showed 0 A on discharge of PLI 2. b 2. Automatic analysis failed (as the calculated discharge was incorrect), but they were signed manually (the discharge was correct!) 2/18/2021 9

S 34 § Missing in ML 4 RU. L 4 – QPS trips while going to STANDBY 2 x 120 A circuits failed at PNO. d 1 o o § Missing in A 34 RB. A 34 – FULLY COMMISSIONED RQD/F. A 34 – blocked (n. QPS crate B 10 R 3 magnet and diode signals swapped) Many 600 A still ongoing: o o o RSS. A 34 B 2: switch Z not active, Gert should check it Several 120 A failed PNO. d 1 Two 60 A to be completed 2/18/2021 10

S 45 § Missing in MR 4 o o RU. R 4 – QPS trips while going to STANDBY One 120 a circuit failed PNO. d 1 o RD 4. R 4 quenched 800 A below target, but made it at the second attempt o RQD/F. A 45 are not yet released by QPS (masked in the global protection of ARC 45) RB. A 45 – all test done, but PNO. b 2 IPQs almost completed § Missing in A 45 o o o 600 A ongoing: o o RQ 7. R 4: QH discharge curves do not match with the past ones (Zinur should check) UA 47 commissioning almost completed RR 53 almost all blocked at CIRCUIT QUENCH VIA QPS (most of the initial “features” are fixed, but problems with the automatic reset) Few 120 -60 A still ongoing 2/18/2021 11

S 45 II § Missing in LL 5 RQ 6. L 5 – When simulating the quench, the detector freezes – circuit blocked RQ 5. L 5 – problem on a TT sensor – blocked by cryo Few 120 A failed PNO. d 1 o o o § Missing in IT. L 5 RQX. L 5 – U_res_Q 2 signal is flat 600 A: o o RCBXH 2. L 5/RCBXH 3. L 5 - TT 893 badly regulated Few 120 A failed PNO. d 1 2/18/2021 12

S 78 § Missing in A 78 o RB. A 78 blocked – EE works well, but many errors in microswitched data in the automatic analysis o o o RQD/F. A 78 ongoing (PIC completed) IPQs ongoing (step @nominal missing) 600 A ongoing – no tests for 7 R since the new firmware is not yet deployed 120 -60 A ongoing o § ML 8 - COMPLETED § Missing in XL 8 o o o 600 A – few to be analysed, all tested Some 120 A failed PNO. d 1 RCTX 3. L 8 – powering failure cannot be reset 2/18/2021 13

S 81 § Missing in XR 8 o o 600 A – few to be analysed, all tested Few 120 A failed PNO. d 1 § Missing in MR 8 o Two 120 A failed PNO. d 1 § Missing in A 81 o o o Mains can go to nominal 600 A ongoing - no tests for 1 L since the new firmware is not yet deployed 120 -60 A ongoing 2/18/2021 14

S 81 II § Missing in LL 1 RQ 4. L 1 last step @PNO o § Missing in XL 1 Two 600 A to be analysed: o o o RCBXH 2. L 1 strange shape of U_res during the ramp (reaching 80 m. V), QPS should check Few 120 A failed PNO. d 1 2/18/2021 15