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nQPS trips due to EMC transients

nQPS trips due to EMC transients . Z.Charifoulline. Thunderstorm@22/06/2011: # nQPS.BS signals in A12 & A34 # statistics over all sectors – how many sectors would be tripped? EMC Transient example in P8

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nQPS trips due to EMC transients

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  1. nQPStrips due to EMC transients Z.Charifoulline • Thunderstorm@22/06/2011: • # nQPS.BS signals in A12 & A34 • # statistics over all sectors – how many sectors would be tripped? • EMC Transient example in P8 • Brief statistics for nQPS trips 2011 (hyperlinks to logbooks) • Current status of BS thresholds for long quad buses (TS#3) ZCh, TE-MPE-TM

  2. 22/06/2011 Thunderstorm in LHC tunnel ev_110622-161742.469_RQ10.R1 ev_110622-161742.468_RQ8.L1 ev_110622-161742.480_RD2.R1 ev_110622-161742.468_RQ8.R1 ev_110622-161742.468_RQ10.L1 ev_110622-161742.477_RQ6.R1 ev_110622-161742.492_RD2.L1 ev_110622-161742.468_RQ9.L1 ev_110622-161742.467_RQ4.R1 # ev_110622-172405.414_RQ8.L5 ev_110622-172405.407_RQ10.R5 ev_110622-172405.418_RQ10.L2 ev_110622-172405.397_RQ10.L4 ev_110622-172405.403_RQ10.R4 ev_110622-172405.401_RQ10.R2 ev_110622-172405.409_RQ10.L1 ev_110622-172405.420_RQ10.L6 ev_110622-172405.401_RQ10.L5 ev_110622-172405.403_RQ8.R4 ev_110622-172405.401_RQ8.L4 ev_110622-172405.409_RQ9.L1 ev_110622-172405.401_RQ9.R2 # ev_110622-174525.904_RQ10.L4 # ev_110622-175508.837_RQ10.L8 ev_110622-175508.836_RQ10.R5 ev_110622-175508.836_RQ8.R6 ev_110622-175508.834_RQ9.L6 # ev_110622-175641.117_RQ10.R8 ev_110622-175641.115_RQ10.L1 ev_110622-175641.115_RQ9.L8 ev_110622-175641.115_RQ9.L1 ev_110622-175641.116_RQ9.R8 # ev_110622-181706.748_RQ10.L2 ev_110622-181706.729_RQ10.L4 ev_110622-181706.730_RQ10.R4 ev_110622-181706.729_RQ10.R2 ev_110622-181706.752_RQ10.L5 ev_110622-181706.730_RQ9.R2 #22/06/2011 16h17: P1 LHC FPA@Injection #22/06/2011 17h24: P1,P2,P4,P5 #22/06/2011 17h55: P5,P6,P8 #22/06/2011 17h57: P1,P8 #22/06/2011 18h17: P2,P4,P5 #22/06/2011 17h45: P4 LHCOP 16h24: Power cut global in the 400 V, all kickers off. LHCOP 17h25: We lost again 4 sectors ZCh, TE-MPE-TM

  3. 22/06/2011 Thunderstorm: Sector A12 B33R1_RQF B31R1_RQD B27R1_RQF B25R1_RQF B15R1_RQD … B32L2_RQF B30L2_RQF B28L2_RQD B24L2_RQD B22R1_RQD B34R1_RQD • A12.RQD/RQF • No significant EMC effects in the first shot. Why? • #22/06/2011 17h24: P1,P2,P4,P5 • more than 12 channels above 500uV; • EMC effect is stronger in the middle of the arc; • EE switches were already open; • Most likely it would trip the circuit. 500uV ZCh, TE-MPE-TM

  4. 22/06/2011 Thunderstorm: Sector A34 B34R3_RQD B28L4_RQD B26R3_RQF B30R3_RQF B12R3_RQF … B31L4_RQF B19L4_RQF B21L4_RQD B25L4_RQD B15R3_RQD B17R3_RQD • A34.RQD/RQF • No significant EMC effects in the first shot. • #22/06/2011 17h24: P1,P2,P4,P5 • more than 12 channels above 500uV; • EMC effect is more uniform over the arc; • EE switches were closed; • Most likely it would trip the circuit. U_RESmax 500uV ZCh, TE-MPE-TM

  5. 22/06/2011 Thunderstorm: overall view & conclusion U_RESmax #22/06/2011 17h24 Thunderstorm => 400V Circuit Breakers But no detailed information found Many sectors would be tripped due to the huge spikes on RQD/RQF-circuits even if IPQs will be stable, but without firing the sleeping quench heaters! Relatively easy solution is to increase the U_RES threshold to 1mV (170nΩ@6kA)? What else? It might be more sophisticated BS-board firmware with Jens experience in the Thermal Amplifier Project (mBS-board). U_RESmax #22/06/2011 17h55 ZCh, TE-MPE-TM

  6. Last nQPS.BS trip at Point8, 16/06/2011“1 fb-1” A81.RQ LHCOP 16/06/2011 14:49: Global Post Mortem Event Confirmation Dump Classification: Other Operator / Comment: stefano / Trip of the main quads in S81 - MP3 investigating the source of the trip. --------------------------- No information found from SPS&Injection team – ALL OK. UFO or Tramp AUG? A81: 98 -> 99 500uV 600uV A78.RQ ZCh, TE-MPE-TM

  7. 2011 nQPS.BS Trip Statistics from logbooks Not so many cases, but not negligible. All in Point 8 so far. Increasing the BS thresholds for all long buses and checking it by power cycling of the concerned units might help in many cases. Now it is very right moment to do so: TS#3. ZCh, TE-MPE-TM

  8. Current status of BS-thresholds for the RQ long buses (30/06/2011) A67.B15L7_RQD(A) A78.B11L8_RQD(A) A78.B11L8_RQF(A) A81.B11R8_RQD(B) A81.B11R8_RQF(B) A81.B11L1_RQD(A) A81.B11L1_RQF(A) ZCh, TE-MPE-TM

  9. Current status of BS-thresholds for the RQ long buses (30/06/2011) A78.B11L8_RQD(A) A78.B11L8_RQF(A) A81.B11R8_RQD(B) A81.B11R8_RQF(B) A81.B11L1_RQD(A) A81.B11L1_RQF(A) ZCh, TE-MPE-TM

  10. Thanks! ZCh, TE-MPE-TM

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