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Ad-hoc MP3 meeting 21/2/2013

Present: Jens, Bernhard, Ezio, Arjan, Gerard, Rudiger, Sandrine, Per, Mirko , Andrzej, Zinour RD2.R8 RD2.R8 is a D2 separation dipole. The cold mass HBMBRCA001-BL000001 is installed there (first of the production). MM available up to 7 kA, so it has been trained up to there.

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Ad-hoc MP3 meeting 21/2/2013

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  1. Present: Jens, Bernhard, Ezio, Arjan, Gerard, Rudiger, Sandrine, Per, Mirko, Andrzej, Zinour RD2.R8 RD2.R8 is a D2 separation dipole. The cold mass HBMBRCA001-BL000001 is installed there (first of the production). MM available up to 7 kA, so it has been trained up to there. Quench during cold test: 6309 A, 6877 A, then up to 7 kA. + one quench at 6309 A after thermal cycle. 7 TeV extrapolated value=6020 A and 6.5 TeV=5590 A. Quenches in 2007/8: 5816, 5788, 5856, 5854 A Quenches in Feb 2013: 5350, 5723, 5779 A Decision 18/2: perform max 1 quench more. Then perform cycle with plateau for 20 min at I_Q_max-100 A. New results: 4thquench done: 5670 A Decision 19/2: Run the circuit for 8 hrs at 5.6 kA. New results: Quench on plateau after 8 min!!!! Decision 20/2: Make sure it is not the BB. If it is the magnet, then perform pyramid 5.4, 5.5, 5.6, 5.7, … with 2 hrs on each plateau, and present a.s.a.p. in TE-TM. New results: Except for the first quench, all quenches are in the BB, very close to the magnet. Sandrine contacted Antonio to check cooling on the bus. Antonio will present. Ad-hoc MP3 meeting 21/2/2013

  2. RD3.L4 (nominal 5850 A, HWC 2008: 4984 A, 5080 A, reduced to 4500 A) RD3.L4 is a D3 separation dipole. The cold mass HCMBRSA001-BL000002 is installed there. Quench during cold test: 6265, 6997, then went up to 7000. No quench after thermal cycle 3 quenches done in Feb 2013: 4660, 4751, 5112 A Decision 20/2: OK for 2 more tests. Check in which aperture quenches occur. New results: Quench 4 at 5293 A, Quench 5 at 5386 A. All 5 quenches in same aperture. Decision 21/2: max 3 quenches more RQTL11.R5B1 (nominal is 550 A, expected for 7 TeV: 250 A) 5 quenches done: 487, 506, 514, 543 and 498 A Decision 20/2: OK for 2 more tests. Check if we can reduce I_nom to 450 A. Check also quenches in 2007 and reception tests. New results: 6th quench at 545 A. 7th quench to be done. Decision 21/2: stop anyhow. Reduce to 450 A. Do PNO to 450A and close. RQTL11.L6B1 (nominal=400 A, expected for 7 TeV: 200 A) 3 quenches done (or more already?) 358, 392, 376 A Decision 20/2: OK for 2 more quenches, check if we can reduce I_nom to 350 A Check also quenches in 2007 and reception tests. New results: 4th test OK. Decision 21/2: Reduce to 350 A and close.

  3. RQX.L2closed (3 Q, 4thPNO OK) RQ5.L5: closed (4 Q, 5th PNO OK) RQ6.R5: closed (3 Q, 4th PNO OK) RQ5.R2: closed (3 Q in B1, 1 Q in B2, I_nom reduced to 4100 A, 5thPNO_red OK) RQ5.R5Closed (1 Q in B1, 2 Q in B2, 4th PNO OK) RQX.L2Closed (3 Q, 4th PNO OK) RSD1.A56B2: Closed (minor issue due to electrical interference) RQ6.L5:Closed (2 Q in B1, 2 Q in B2, 5th run OK)

  4. RQ4.R6: Closed (Q on plateau, PNO.c4 with 2x2 hr OK) RQ7.L4: Closed (Q on plateau, PNO.c4 with 2x2 hr OK) RQ6.L2: Closed (Q on plateau, PNO.c4 with 2x2 hr OK) RQTD.A23B1: Closed (Q at plateau, PNO.c4 with 2x2 hr OK) RCD.A56B2: Closed (Q at plateau, PNO.c4 with 2x2 hr OK) RQS.L5B2: Closed (TT893>324 K, ELQA informed) RQT13.R5B1:Closed (QPS A&B frozen) RQ4.L5:Closed (QPS A&B frozen)

  5. RCD.A45B1 (Q at plateau of 550 A) fail/flag Decision 20/2: pyramid, 500 A (20 min)-525 A (20min) 550 A (2 hr) New results: Pyramid OK. PNO test OK. Closed ROF.A45B2 (Q at plateau of 590 A) fail/flag Decision 20/2: pyramid, 500 A (20 min)-525 A (20min) 550 A (2 hr) New results: Pyramid OK. PNO test OK. Closed RQ6.R2 (Q at 3896, 4124, 4190 all in B1) Decision 21/2: perform max 2 quenches more RQ5.R1 (Q at 3910, 4086, 4286 all in B1) Decision 21/2: perform max 2 quenches more RQ5.L1 (Q at 4105 B1, 3881 B2, 4185 B2) Ad hoc decision 21/2: perform 4th run RQ6.L7B1: QPS triggered when ramping down in PNO.a3. Very noisy U_RES signal. Forwarded to QPS. 0 V crossing. Check and repeat. RQT13.R6B1 (550 A): Quench after 90 s at plateau. Decision 21/2: perform pyramid 500 (20 min), 525 (20 min), 550 (2 hr)

  6. RQTF.A56B1 (Q at 500 A, Q at plateau) Q at 500 A and Q t plateau look very similar, so probably both in the magnet. Ad hoc decision 19/2 PM: perform pyramid 500-525-550 A with 20 min on plateau. Pyramid done. Closed RQS.A56B2 (Q at 520 A, Q at plateau) Q at 500 A and Q t plateau look very similar, so probably both in the magnet. Ad hoc decision 19/2 PM: perform pyramid 500-525-550 A with 20 min on plateau. Result: Failed after 10 min at 550 A. Decision 20/2: pyramid to 450, 475, 500, 525 (all 20 min), 550 A (2 hrs). in parallel we try to see if the previous 2 quenches were in the magnet or the bus. Install DVM (Mateusz) if possible. Pyramid OK. Closed RQS.R5B1 (Q at plateau, but no QPS PM file) Ad hoc decision 19/2 PM: perform pyramid 500-525-550 A with 20 min on plateau. Not yet done

  7. RQX.R1 heaters fired after PC_failure(Note that one heater is at 850 V). Decision 18/2: Sandrine will do a detailed analysis, checking possible imbalance in QPS. New results: See slides Sandrine. It seems that the heaters are swapped between 2007 and now. Decision 19/2: Small current cycle to be done to confirm QPS signals. Afterwards we have to ask Richard to check proper connections with heaters. Decision 20/2: Q1 and Q2 of board A are the same? To be checked by QPS. Stop powering tests. Magnet has reached nominal. NC to be done. Decision 20/2: Check if link PC_failure-Heater firing is still active. Perform current cycle to PNO. PNO OK. Closed RQS.A56B2: 200 ms delay on switch opening New results: Sandrine did very detailed analysis, see slides. All RQS have 190 ms delay. Delay is OK for protection. Carry on tests on the other RQS circuits. Jens will check why U_RES remains saturated for 200 ms even though there is only a very short distortion. Forwarded to QPS. Closed RCBX: 550 A with low RR. Decision 18/2: 1st ask for overcooling on leads. If no improvement then reduce I_nom to 450-500 A. New: For info: Mikko gave a list of weak MCBX magnets, that could only work with Q1 magnets. Check correlation.

  8. RQ5.R1: Quench on B1 but not in B2? Sandrine and Ivan analysed and they think it is a PC problem, and not a quench. Hugues shows that the voltages on the leads correspond to the DCCT currents. It seems very likely that the quench was not detected by QPS and the heaters were not fired. Decision 19/2: Jens will check QPS boards in detail, and check in timber if boards were blocked in the past. Lock circuit. We should probably perform an ELQA test. 2 quenches done (3910, 4086). Heaters not fired. Both boards stuck. After reset both boards came back. No signals since aug 21, 2012. Seems software issue, not a hardware problem. Scan boards + reset IPQ/IPD/IT. Decision 20/2: Issue forwarded to QPS. New results: Hot spot of first 2 quenches would have been maximum 350 K. ELQA OK. 3rd quench at 4286 A. Decision 21/2: perform 4th run

  9. RQ5.R1 MIITs-Temp Estimate PM 130219-081205.420_RPHGB.RR17.RQ5.R1.R1B1 Cable 4: 36 strands, diam 0.475 mm, cu/sc 1.75, RRR 80 MIITs from PM file: 3.53 MA2s Iq = 4086 A, Bpeak(Iq) = 4.8 T 250 K < Tpeak < 350 K

  10. RCBYHS5.R8B1: quenches at 64 A “Decision 19/2”: we will discuss tomorrow Decision 20/2:we will discuss tomorrow Decision 21/2:one person (Gerard/Zinour) will look in detail, we will discuss tomorrow RCBXH3.L5: ELQA OK. Tripped in the past at 50 A one person will look in detail. Who??? RCO.A78B2: special ELQA to be done PGC in arc alone? Decision 20/2: Everywhere!!!! Closed Comments from GLM: (Rudiger) RQ.A34 because int. splice resistance of 15+15 nOhm in Q7? Should circuit be tested to 6.5 TeV? Recommendation 20/2: No, and send e-mail to GL’s (Arjan). Done. To be cntd…..

  11. RCBXH2.R5 – CL cooling problems, already few runs RQSX3.R5 – CL cooling problem PNO OK. Closed. RSBXV1.R5 – CL cooling problem, valves at 100% after 9min@flatTop To be looked at by somebody. Who??? Proposal: heater induced quench on RQ6.L8 at 2500 A, in order to compare with the beam-induced quench 1 week ago. Mateusz should first check if his scope is ready to acquire data. Decision 20/2: Yes New results: Test done. Signals look fine. Analysis to be done. Closed (for the moment)

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