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Ad-hoc MP3 meeting 25/2/2013

Present: Gerard, Rudiger , Daniel, Arjan , Mateusz, Ezio , Mirko , Matteo RD2.R8 (7 TeV =6020 A, 6.5 TeV =5590 A) RD2.R8 is a D2 separation dipole. C old mass is HBMBRCA001-BL000001 ( 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 25/2/2013

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  1. Present: Gerard, Rudiger, Daniel, Arjan, Mateusz, Ezio, Mirko, Matteo RD2.R8(7 TeV=6020 A, 6.5 TeV=5590 A) RD2.R8 is a D2 separation dipole. Cold mass is HBMBRCA001-BL000001 (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. 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 at 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. 21/2: Antonio presented possible cooling problem of the bus if the plug is not at the lowest point. Radios by CRYO foreseen asap. See also picture of positioning of the RD2.R8 bus. Re-alignment foreseen for 25/2 PM. Ad-hoc MP3 meeting 25/2/2013

  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 (U_RES_B1 positive). Decision 21/2: max 3 quenches more New results: 6th quench at 5444 A Decision: Train up to 6.6 TeV equivalent (5515 A). Then stop because this magnet was already a slow trainer at BNL with a bad memory, and we are pretty sure that the magnet will reach nominal, but we don’t want to overstress. New results: 7th quench at 5784 A. I_nom (temporarily) reduced to 5600 A. PNO (to be) done Closed (but to be looked at in detail after the powering tests)

  3. RQ6.R2 (Q at 3896, 4124, 4190 all in B1) Decision 21/2: perform max 2 quenches more New results: Q at 4251 A in B1, 3908 A in B2 (with B1 at nominal) Decision 25/2: max 2 quenches more RQTD.A23B1 (550 A): Quench at plateau. Ad-hoc decision 21/2: perform pyramid 500 (20 min), 525 (20 min), 550 (2 hr) New results: probably done?? To be checked RCBXV3.L8 (550 A): Quench at plateau. Decision 22/2: PNO tests with 1 hr plateau at 500, 525 and 550 A (note overcooling restrictions) Pyramid OK. Closed

  4. RQ5.R1: 2 quenches (3910 and 4086 A) on B1 but not in B2? Sandrine and Ivan analysed and they think it is a PC problem, and not a quench. Huguesshows 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. 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 in B1. Decision 21/2: perform max 2 quenches more New results: 4th and 5th quench at 3718 and 4071 (both in B2 with B1 at 4310 A). Decision 22/2: max 2 quenches more New results: 6th and 7th quench at 4183 and 4267 A (both in B2 with B1 at nominal) Decision 25/2: max 2 quenches more

  5. RCBYHS5.R8B1: quenches at 64 A “Decision 19/2”: we will discuss tomorrow Decision 20/2:we will discuss tomorrow Decision 21/2:we will discuss tomorrow New results: Gerard and Bernhard looked in detail. Known poblem. Quenched 4 times at 63-64 A. Quench level getting lower wrt previous HWC. 1 hr plateau at 55 A. Trip when ramping down. Decision 22/2: Look also at other cases in the machine. Keep I_nom at 20 A. Perform PNO, but no other tests. Needs follow up with recommendation to fix/replace magnet. RCBXH3.L5: ELQA OK. Tripped in the past at 50 A Decision 22/2: QPS problem. Intervention in tunnel according to proposal Zinour. New results: Some inversion in wiring, possibly with ‘inversion’ in firmware. Magnet has reached nominal in earlier HWC. If time and if Reiner knows what could be the problem, we might retest today. Otherwise to be repaired during LS1. RCO.A78B2: special ELQA to be done One pyramid to 20 A is done. Pyramid to 50 A ongoing. R seems not linear. To be cntd PGC test, for all remaining sectors: Add a PNO test before the PGC for the IPQ’s with equal currents in B1 and B2. Perform PGC with I_nom-100 A in IT, IPD, IPQ, and I_nom-25 A in 600 A circuits. Closed.

  6. Closed issues linked to excessive quenching RQX.L2:Closed(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.R5:Closed (1 Q in B1, 2 Q in B2, 4th PNO OK) RQX.L2:Closed (3 Q, 4th PNO OK) RQ6.L5:Closed (2 Q in B1, 2 Q in B2, 5th run OK) RQTL11.R5B1: Closed (nominal is 550 A, expected for 7 TeV: 250 A, Q at 487, 506, 514, 543, 498, 545 A, PNO reached, reduced to 450 A) RQTL11.L6B1: Closed (nominal=400 A, expected for 7 TeV: 200 A, Q at 358, 392, 376 A, reduced to 350 A) RQ5.L1: Closed (3 Q, 4th PNO OK)

  7. Closed issues linked to quenches on plateau 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) RCD.A45B1: Closed (Q at plateau of 550 A, Pyramid and PNO OK) ROF.A45B2 : Closed (Q at plateau of 550 A, Pyramid and PNO OK) RQTF.A56B1: Closed (Q at 500 A, Q at plateau, Pyramid OK) RQS.A56B2: Closed (Q at 520 A, Q at plateau, Pyramid OK) RQT13.R6B1: Closed (Q at plateau, Pyramid OK) RQS.R5B1: Closed (Q at plateau, Pyramid OK)

  8. Closed issues (Various) RQS.L5B2: Closed (TT893>324 K, ELQA informed) RQT13.R5B1:Closed (QPS A&B frozen) RQ4.L5:Closed (QPS A&B frozen) RSD1.A56B2: Closed (minor issue due to electrical interference) RQ6.L8: Closed (Heater induced quench at 2500 A) PGC in arc alone?: Closed (Everywhere!!!) RQS.A56B2: Closed (U_RES saturation, forwarded to QPS) RQX.R1: Closed (heater firing after PC_failure, PNO OK, Q1 and Q2 on board A the same) RCBXH2.R5: Closed (CL cooling problems) RQSX3.R5: Closed (CL cooling problem) RSBXV1.R5 : Closed (CL cooling problem) RQ6.L7B1: Closed (QPS trip due to noise in PC. Forwarded to EPC) RQ7.R4:Closed (repetitive trips during PGC, also one at stable 4.8 kA, PC related)

  9. New PNO values RQ5.R2: 4310 reduced to 4100 A RQTL11.R5B1 reduced to 450 A RQTL11.L6B1 reduced to 350 A

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