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Ad-hoc MP3 meeting 27/2/2013

Present : Zinour , Rudiger , Michele, Arjan , Daniel, Per, Mirko , Matteo. RSD1. A12B2 ( 590 A): Quench at plateau (590 A). Pyramid done (550, 40min, 570 40 min, 590, 40 min). Quench at plateau of 550 A after 12 min

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Ad-hoc MP3 meeting 27/2/2013

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  1. Present: Zinour, Rudiger, Michele, Arjan, Daniel, Per, Mirko, Matteo RSD1. A12B2 (590 A): Quench at plateau (590 A). Pyramid done (550, 40min, 570 40 min, 590, 40 min). Quench at plateau of 550 A after 12 min New pyramid done (460, 40 min, 490, 40 min, 520, 40 min, 550, 40 min, 590). Pyramid OK. RCS.A34B1: Quench at plateau (-550 A). Pyramid to be done (-500, 40 min, -525, 40 min, -550, 40 min). Pyramid OK. RCSSX3.L1: 2 Q during ramp up at about 64 A. Pyramid done (40 A, 40 min, 50 A, 40 min, 60 A, 40 min, 65 A, 40 min). Quenched again at 64 A. I_PNO reduced to 60 A. Closed RCBXH3.L5: Strange 300 K temperature regulation on the leads. Forwarded to ELQA. Perform pyramid 150, 250, 350, 450, 550 A. Closed Ad-hoc MP3 meeting 27/2/2013

  2. RQTF.A34B1: Quench at plateau. Pyramid to be done (500, 20 min, 525, 20 min, 550, 2 hr). Pyramid OK. Closed RQTF.A78B1:Quench at plateau. Pyramid to be done (500, 20 min, 525, 20 min, 550, 2 hr). Pyramid done. PNO OK. Closed RQTF.A12B1:Quench at plateau. Pyramid to be done (500, 20 min, 525, 20 min, 550, 2 hr). Pyramid OK. Closed And in 2007/2008 similar quenches observed on RQTF.A45B2

  3. K-H Mess, Chamonix 2009 RQT13.L5B1, RQTF.A45B2, ? Is there a bad splice hidden somewhere? Is reducing the nominal current enough???

  4. 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. New results 25/2: compensation now seems to work fine. Complete commissioning to be done. New results 26/2: Fully commissioned. Closed RCO.A78B2: special ELQA to be done Pyramids to 20 A and 58 A done. V(I)=R is not linear, see plot. Diagnostics in the tunnel to better localize the defect(s) foreseen for 26/2 or 27/2. 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 (at first look) quench in both busbars. DFBLA together with RQ6.L1, RQ5.L1 and RQ4.L1. RQ4.L1 geos in SPA, then the bus heats up due to RD2.L1 and then quenches 8 sec after RD2.L1. Antonio will be contacted to check the cooling.

  5. Closed issues linked to excessive quenching RQX.L2:Closed(3 Q, 4thPNO OK) RD3.L4: Closed (7 quenches, I_nom reduced from 5850 to 5600 A) 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) RQ6.L5:Closed (2 Q in B1, 2 Q in B2, 5th run OK) RQ5.R1: Closed (3 Q in B1, 4 Q in B2, 8th 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)

  6. 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 hrOK, Q at plateau, Pyramid OK, PNO OK) RQTF.A67B2: Closed (3 Q’s, Quench at plateau, Pyramid forgotten. PNO 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) RCS. A81B1: Closed (Q at 544 A, Quench at plateau after 6 min, Pyramid 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) RCBXV3.L8: Closed (Q at plateau, Pyramid OK) RQTL11.R3B1: Closed (Quench at plateau, Pyramid OK)

  7. Closed issues (Various) RQX.R1: Closed (heater firing after PC_failure , PNO OK, Q1 and Q2 on board A the same) RQ4.L5:Closed (QPS A&B frozen) RQ6.L8: Closed (Heater induced quench at 2500 A) RQ7.R4:Closed (repetitive trips during PGC, also one at stable 4.8 kA, PC related) RD2.R8: Closed (1 Q at 5350 in magnet, 4 Q’s in busbar, re-alignment by CRYO, PNO to 6020) RQS.L5B2: Closed (TT893>324 K, ELQA informed) RQT13.R5B1:Closed (QPS A&B frozen) RSD1.A56B2: Closed (minor issue due to electrical interference) RQS.A56B2: Closed (U_RES saturation, forwarded to QPS) 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) RCBYHS5.R8B1:Closed (Repetitive quenching at 64 A, I_nom reduced to 20 A) PGC in arc alone?: Closed (Everywhere!!!)

  8. New PNO values RD3.L4: reduced from 5850 to 5600 A RQ5.R2: reduced from 4310 to 4100 A RQTL11.R5B1: reduced from 550 to 450 A RQTL11.L6B1: reduced from 400 to 350 A RCBYHS5.R8B1: reduced fro72 to 20 A RCSSX3.L1: reduced from 100 A to 60 A

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