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MP3 findings after the powering tests of Feb 2013

Arjan Verweij, on behalf of the MP3. MP3 findings after the powering tests of Feb 2013. IPD’s & IPQ’s (pres. Sandrine) IT’s 600 A 80-120 A Special tests Conclusion. Thanks a lot to QPS, EPC, CRG, OP, and especially Mirko and Matteo, for the very fast execution of all the tests.

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MP3 findings after the powering tests of Feb 2013

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  1. Arjan Verweij, on behalf of the MP3 MP3 findings after thepowering tests of Feb 2013 • IPD’s & IPQ’s (pres. Sandrine) • IT’s • 600 A • 80-120 A • Special tests • Conclusion Thanks a lot to QPS, EPC, CRG, OP, and especially Mirko and Matteo, for the very fast execution of all the tests A. Verweij, TE-MPE, 19/3/2013

  2. The new MP3 started end Jan. 2013 with 12 members from the MPE and MSC groups, with wideexpertise in Magnets, QPS, PIC, ELQA, EE, Electro-thermal modeling, Quench behaviour, Magnet testing, Data acquisition, Databases, … MPE:MSC: Bernhard Auchmann Per Hagen Mateusz Bednarek Sandrine Le Naour ZinourCharifoulline Michele Modena Ivan Romera Ezio Todesco Jens Steckert Gerard Willering Arjan Verweij Daniel Wollmann temporary site: cern.ch/mp3 A. Verweij, TE-MPE, 19/3/2013

  3. The test program and nominal currents are described in EDMS 1265662 (M. Pojer, M. Solfaroli) “Individual” tests: IPQ & IPD: asymmetric ramp to nominal, flat-top of 30 min, FPA (without firing the heaters) IT: ramp to nominal, flat-top of 30 min, FPA (without firing the heaters) 600 A: 1) current cycle to nominal with flat-tops of 30 min at Inom and –Inom. 2) ramp to nominal, FPA (using EE if present) PGC (powering Group of Circuits): Ramp to nominal in all circuits of a sector (including 80-120 A), plateau (2 hrs), FPA Special tests A. Verweij, TE-MPE, 19/3/2013

  4. IT’s All IT’s went straight to nominal except RQX.L2 (3 quenches) and RQX.R2 (1 quench). Comparison with earlier HWC campaigns and quench results before installation in the LHC still has to be done. A. Verweij, TE-MPE, 19/3/2013

  5. 600 A circuits in the IT’s All leads needed overcooling. All 56 circuits are qualified for 550 A. A. Verweij, TE-MPE, 19/3/2013

  6. 600 A circuits in the sectors When starting the powering tests, the nominal current in all circuits was set to 550 A except for: ROD/F in all sectors: 600 A RSD/F in S81, S12, S45, S56: 600 A A. Verweij, TE-MPE, 19/3/2013

  7. 600 A circuits in the sectors 21 quenches have been observed at constant nominal current. Analysis is ongoing. These quenches are probably caused by small conductor movements (linked to mechanical creep?). For future HWC one should see if it is better to have a difference in current of about 2% between the individual tests and the PGC. A. Verweij, TE-MPE, 19/3/2013

  8. RQTL11.R5B1: nominal reduced from 550 to 450 A due to erratic quenching between 480 and 550 A. Expected for 7 TeV: 255 A S. Le Naour A. Verweij, TE-MPE, 19/3/2013

  9. RQTL11.L6B1 : nominal reduced from 400 to 350 A due to erratic quenching between 360 and 400 A. Expected for 7 TeV: 200 A. S. Le Naour A. Verweij, TE-MPE, 19/3/2013

  10. 80-120 A circuits All circuits were already commissioned to 7 TeV equivalent before. During PGC test they all went to nominal again, with the following remarks: A. Verweij, TE-MPE, 19/3/2013

  11. ReducedPNO values for the Feb 2013 powering tests RD3.L4: reduced from 5850 to 5600 A (but can very likely be trained to 5850 A if needed) RQ5.R2: reduced from 4310 to 4100 A (but can very likely be trained to 4310 A if needed) RQTL9.R3B2: reduced from 450 to 425 A RQTL11.R5B1: reduced from 550 to 450 A RQTL11.L6B1: reduced from 400 to 350 A RCBYHS5.R8B1: reduced from 72 to 20 A RCSSX3.L1: reduced from 100 A to 60 A ROD/F in all sectors reduced from 600 to 590 A RSD/F in S81, S12, S45, S56 reduced from 600 to 590 A A. Verweij, TE-MPE, 19/3/2013

  12. Special tests: 1) Tests on RCO.A78B2 2) FPA tests in various 600 A circuits at several current levels (EDMS 1261814). Motivation: more data to improve the Pspice simulations 3) FPA tests in RQTD with 4 different values of the EE resistance (EDMS 1264959). Motivation: Avoid quench-back & reduce voltage during quench/FPA & have possibility to reduce ELQA voltage A. Verweij, TE-MPE, 19/3/2013

  13. RCO.A78B2 M. Bednarek The high resistance spot was localised between magnet C19L8 and B20L8 (3 ICs, 1 magnet, 2 connections busbar – magnet). Possible recommendation: 1) open and inspect for visible defect 2) repair or bypass entire segment (using spare bus) To be cntd… A. Verweij, TE-MPE, 19/3/2013

  14. FPA tests in various 600 A circuit Tests successfully performed on 13 circuits with EE and 6 circuits without EE, at several current levels (between 200-550 A). Analysis ongoing. Events: FGC 51_self 110219-010757.080_RPMBB.UA67.RQTD.A67B1 FGC 51_self 080827-145831.100_RPMBB.UA23.RQTD.A12B1 FGC 51_self 080422-115213.960_RPMBB.UA63.RQTD.A56B2 FGC 51_self 110214-192759.320_RPMBB.UA27.RQTF.A23B2 Daniel Egede Rasmussen A. Verweij, TE-MPE, 19/3/2013

  15. FPA tests in RQTD with 4 different values of the EE resistance Daniel Egede Rasmussen A. Verweij, TE-MPE, 19/3/2013

  16. Conclusion: • No show-stopper for 7 TeV: • IT: good quench performance, although RQX.L2 and R2 show a first training quench at 6.75 TeV equivalent. Only 1 training quench in all the 600 A corrector circuits. • IPD & IPQ: see talk Sandrine. • 600 A circuits: 80 quenches in total. In 3 circuits it would be better to reduce Inom with 25, 50 and 100 A respectively. The analysis of the quenches at flat-top is ongoing. • 80-120 A circuits: the nominal current in a few circuits has to be reduced, probably due to an inter-turn short. There is no evidence that these shorts have degraded in the last years. • All the special tests were very successful. Analysis ongoing. A. Verweij, TE-MPE, 19/3/2013

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