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MP3 meeting 5/3/2013

MP3 meeting 5/3/2013. Recap of the powering tests Feb 2013 About 1000 tests (on roughly 550 circuits) analysed and signed in about 10 days. Arjan Verweij, MP3 meeting 5/3/2013. Closed issues linked to ‘excessive’ quenching (≥3 Q for IT,IPD,IPQ or ≥5 Q for 600 A) RQX.L2: 3 Q, 4 th PNO OK

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MP3 meeting 5/3/2013

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  1. MP3 meeting 5/3/2013 Recap of the powering tests Feb 2013 About 1000 tests (on roughly 550 circuits) analysed and signed in about 10 days. Arjan Verweij, MP3 meeting 5/3/2013

  2. Closed issues linked to ‘excessive’ quenching (≥3 Q for IT,IPD,IPQ or ≥5 Q for 600 A) RQX.L2:3 Q, 4thPNO OK RD3.L4: 7 Q, I_nom reduced from 5850 to 5600 A !!!!! RQ5.L1: 3 Q, 4th PNO OK RQ5.L5: 4 Q, 5th PNO OK RQ5.R1: 3 Q in B1, 4 Q in B2, 8th run OK, First 2 quenches without detection and heater firing. Maximum hot spot calculated to be 350 K. RQ5.R2: 3 Q in B1, 1 Q in B2, I_nom reduced to 4100 A, 5thPNO_red OK RQ5.R5: 1 Q in B1, 2 Q in B2, 4th PNO OK RQ6.L5:2 Q in B1, 2 Q in B2, 5th run OK RQ6.R5: 3 Q, 4th PNO OK RQTL11.R5B1:I_nom=550 A, expected for 7 TeV: 250 A, Q at 487, 506, 514, 543, 498, 545 A, PNO OK, I_nom reduced to 450 A RQTL11.L6B1: I_nom=400 A, expected for 7 TeV: 200 A, Q at 358, 392, 376 A, I_nom reduced to 350 A Arjan Verweij, MP3 meeting 5/3/2013

  3. Closed issues linked to quenches on plateau RQ4.R6: Q on plateau, PNO.c4 with 2x2 hrOK RQ7.L4: Q on plateau, PNO.c4 with 2x2 hrOK RQ6.L2: Q on plateau, PNO.c4 with 2x2 hrOK RQTD.A23B1: Q at plateau, PNO.c4 with 2x2 hrOK, Q at plateau, Pyramid OK, PNO OK RQTF.A67B2: 3 Q, Quench at plateau, Pyramid forgotten. PNO OK RQTF.A56B1: Q at 500 A, Q at plateau, Pyramid OK RQTF.A34B1: Q at plateau, Pyramid OK RQTF.A78B1: Q at plateau. Pyramid OK RQTF.A12B1: Q at plateau. Pyramid OK And in 2007/2008 similar quenches on plateau observed on RQTF.A45B2 Arjan Verweij, MP3 meeting 5/3/2013

  4. RCD.A56B2: Q at plateau, PNO.c4 with 2x2 hrOK RCD.A45B1: Q at plateau (550 A), Pyramid OK RCS. A81B1: Q at 544 A, Quench at plateau after 6 min, Pyramid OK RCS.A34B1: Q at plateau (-550 A), Pyramid OK ROF.A45B2: Q at plateau (550 A), Pyramid OK RQS.A56B2: Q at 520 A, Q at plateau, Pyramid OK RQS.R5B1: Q at plateau, Pyramid OK RCBXV3.L8: Q at plateau, Pyramid OK RQT13.R6B1: Q at plateau, Pyramid OK RQTL9.R3B2: Q at plateau, Q at pyramid, I_nom reduced to 425 A RQTL11.R3B1: Quench at plateau, Pyramid OK RSD1. A12B2 (590 A): Q at plateau (590 A), Quench at plateau (550 A), Pyramid OK Arjan Verweij, MP3 meeting 5/3/2013

  5. Closed issues (Various) RQX.R1: heater firing after PC_failure , PNO OK, Q1 and Q2 on board A the same RD2.R8: Q at 5350 A in magnet, 4 Q’s in busbar, re-alignment by CRYO, PNO to 6020 A OK RQ4.L5:QPS A&B frozen RQ7.R4:repetitive trips during PGC, also one at stable 4.8 kA, PC related RQ6.L7B1: QPS trip due to noise in PC. Forwarded to EPC RQS.L5B2: TT893>324 K, ELQA informed RQT13.R5B1:QPS A&B frozen RSD1.A56B2: minor issue due to electrical interference RQS.A56B2: U_RES saturation, forwarded to QPS RCBXH2.R5: CL cooling problems RQSX3.R5: CL cooling problem RSBXV1.R5: CL cooling problem RCBYHS5.R8B1:Repetitive quenching at 64 A, I_nom reduced to 20 A Arjan Verweij, MP3 meeting 5/3/2013

  6. RCBXH3.L5: Instrumentation error (polarity swap), fully commissioned to I_nom RCSSX3.L1: 3 Q at about 64 A, I_PNO reduced to 60 A RCBXH3.L5: 300 K regulation problem, forwarded to ELQA RCO.A78B2: special ELQA to be done Pyramids to 20 A and 58 A done. V(I)=R is notlinear. Diagnostics in the tunnel to better localize the defect(s). See presentation Mateusz. RD2.L1: Quench at 3884 A during ramp up with very slow developing U_RES. MBRC working at 4.5 K with I_nom=4400 A. Seems quench in both busbars, triggered by a mechanical movement. DFBLA together with RQ6.L1, RQ5.L1 and RQ4.L1. RQ4.L1 goes in SPA, then its bus heats up due to RD2.L1 and then quenches 8 sec after RD2.L1. Special powering cycles with I_nom in D2, Q4, Q5, and Q6 passed without quenching. Special powering cycles with I_nom in D2, Q4, and Q5 and 55-100% in Q6.B1/B2 passed without quenching. Arjan Verweij, MP3 meeting 5/3/2013

  7. Special tests RQ6.L8: heater induced quench at 2500 A (for comparison with signals during beam induced quench) 20-30 FPA tests at various currents. Motivation: have more experimental data to compare to PSpice & Roxie simulations. EDMS 1261814 About 10 FPA tests with smaller energy extraction resistance on RQTD.A34B1 Motivation: reduce quench-back & reduce ELQA voltage. EDMS 1264959 Arjan Verweij, MP3 meeting 5/3/2013

  8. New PNO values RD3.L4: reduced from 5850 to 5600 A (but can be trained to 5850 if needed) RQ5.R2: reduced from 4310 to 4100 A (but can be trained to 5850 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 Arjan Verweij, MP3 meeting 5/3/2013

  9. Follow up: • Analysis special FPA tests (action: Daniel Rasmussen). • IPQ’s & IPD’s: Is the training now faster, similar, or slower than in 2007/8 and as compared to reception tests? If training is getting worse, should we recommend MSC to have a spare ready? Especially important for RD3.L4. (action: Sandrine) • 600 A circuits: Is the training now faster, similar, or slower than in 2007/8 and as compared to reception tests? • What is the reason of the quenches on plateau. Why do they occur a lot in the RQTD/F circuits? (action: Michele) • RCO.A78B2. Do we recommend repair? (action: Mateusz) • What about the quenches in RCBYHS5? Are there more circuits similar to this one? Can we operate with reduced currents or should we recommend replacement? Is there a risk that the circuits degrade in time? (action : Bernhard) • Presentation at TE-TM on 19/3: Presentations from EPC (Valerie), QPS (Jens or Reiner), MP3 (Sandrine and Arjan). • Presentation LMC. Arjan Verweij, MP3 meeting 5/3/2013

  10. Follow up (more general): • While analysing the tests in the CCC it became clear that: • We need an easy-to-use database with all quench data from the past, and in which we can easily put new quench data in. • Many tests can be analysed fully (or at least more) automatically. Check of temperature regulation in the DFB, check of splice resistances, …. Do we continue with the LabView tools or develop new analysis tools? • Results from the past (NC’s, HWC results, QPS settings, PC characteristics, quenches, …) should be easily retrievable, preferably classified per circuit type & circuit. • We need to build a library with example plots of typical events (magnet quench, bus quench, current lead quench, FPA, PC trip) for each circuit type, and with a PM example from the past (if available). Arjan Verweij, MP3 meeting 5/3/2013

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