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QPS thresholds for selected 600 A circuits update from MPE-TM 24.01.2013. B. Auchmann, D. Rasmussen, A. Verweij with kind help from J. Feuvrier , E. Garde , C. Gilloux , R. Denz , M. Karppinen , Q. King, Y. Thurel , G . Willering. MP3 meeting 26.02.2013. Overview.
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QPS thresholds for selected 600 A circuitsupdate from MPE-TM 24.01.2013 B. Auchmann, D. Rasmussen, A. Verweij with kind help from J. Feuvrier, E. Garde, C. Gilloux, R. Denz, M. Karppinen, Q. King, Y. Thurel, G. Willering MP3 meeting 26.02.2013
Overview • Recall recommendation • Reiner’s request • Busbar analysis • Magnet analysis • Special problems (wire between coils and splices) • Recommendation
Recommendation from TE-MPE-TM, 24. 01. 2013 • The busbar protection defines the upper limit for QPS thresholds of all studied circuits:Uth ≤ 0.8 V, Δtdiscr≤ 190 ms • Respecting these limits, set thresholds to the lowest practicable values.
Threshold update request • Reiner Denz 30. 01. 2013, discrimination time 20 ms(complete list of all points available) CIRCUITR_PARLdIdtU_MAXU_TH (proposed)[V] RSS.A78B1 0.60 0.133371 3 0.4001 0.8000 RSS.A78B2 0.60 0.133371 3 0.4001 0.8000 RQS.R7B1 0.50 0.053516 3 0.1605 0.8000 RQS.A78B2 1.00 0.113031 3 0.3391 0.8000 ROF.A78B1 Missing 0.012000 5 0.0600 0.4000 ROF.A78B2 Missing 0.019500 5 0.0975 0.4000 ROD.A78B1 Missing 0.019500 5 0.0975 0.4000 ROD.A78B2 Missing 0.012000 5 0.0600 0.4000 RQTL7.R7B2 0.25 0.119717 1.5 0.1796 0.8000 RQTL8.R7B2 0.25 0.119717 1.5 0.1796 0.8000 RQTL9.R7B1 0.50 0.239435 1.5 0.3592 0.8000 RQTL9.R7B2 0.50 0.239435 1.5 0.3592 0.8000 RQTL10.R7B1 0.25 0.119717 1.5 0.1796 0.8000 RQTL10.R7B2 0.25 0.119717 1.5 0.1796 0.8000 RQTL11.R7B1 0.25 0.119717 5 0.5986 1.2000 RQTL11.R7B2 0.25 0.119717 5 0.5986 1.2000 RQT12.R7B1 0.25 0.028258 5 0.1413 0.4000 RQT12.R7B2 0.25 0.028258 5 0.1413 0.4000 RQT13.R7B1 0.25 0.028258 5 0.1413 0.4000 RQT13.R7B2 0.25 0.028258 5 0.1413 0.4000
QP3 check of 1.2 V threshold • A. Verweij, QP3 calculation rules out 1.2 V threshold
Impact of new thresholds on magnets • Daniel simulated magnet quenches all relevant configurations.Temperature increases are acceptable. circuitT_currentT_porposed % T increase RSS.A78B1 94 1006.4 RSS.A78B2 94 1006.4 RQS.R7B1 1001044.0 RQS.A78B2 9110111.0 ROF.A78B1 4051 27.5 ROF.A78B2 43 5527.9 ROD.A78B1 43 5527.9 ROD.A78B2 40 5127.5 RQTL7.R7B2 148 1490.7 RQTL8.R7B2 148 1490.7 RQTL9.R7B1 135 1393.0 RQTL9.R7B2 135 1393.0 RQTL10.R7B1 148 1490.7 RQTL10.R7B2 148 1490.7 RQTL11.R7B1 148 1490.7 RQTL11.R7B2 148 149 0.7 RQT12.R7B1 96 100 4.2 RQT12.R7B2 96 1004.2 RQT13.R7B1 96 1004.2 RQT13.R7B2 96 1004.2
Unstabilized wire between coils and splices • Problem 1: RQT wire btw. splice and R// • Problem solved by additional copper wire to bridge splice and R//. • Information by M. Karppinen. 600 A busbar wire 3 R// additional copper wire
Unstabilized wire between coils and splices • Problem 2: wire routing outside of coil • Longest routing: MQTLI, ~20 cm
Problem 2: QP3 + ROXIE estimate • Simulate MIITs for magnet quench in low-field region with new thresholds: 0.032 MA2s in worst case (RQTL7, MQTLI assemblies). • Add these MIITs to a QP3 simulation of adiabatic unidirectional quench propagation through 20-cm-long wire 3. • Case 1: RRR=100. Voltage is 75 mV when normal zone enters the magnet, and T_max=32 K. The additional MIIts=0.032 result then in T_max=182 K. • Case 2: RRR=200. Voltage is 45 mV when normal zone enters the magnet, and T_max=28 K.Theadditional MIIts=0.032 result then in T_max=131 K. • Result: Safe for 0.8 V, 20 ms.
Recommendation for new thresholds • (complete list of all points available) RR73/RR77 CIRCUITR_PARLdIdtU_MAXU_TH (proposed)[V] RSS.A78B1 0.60 0.133371 3 0.4001 0.8000 RSS.A78B2 0.60 0.133371 3 0.4001 0.8000 RQS.R7B1 0.50 0.053516 3 0.1605 0.8000 RQS.A78B2 1.00 0.113031 3 0.3391 0.8000 ROF.A78B1 Missing 0.012000 5 0.0600 0.4000 ROF.A78B2 Missing 0.019500 5 0.0975 0.4000 ROD.A78B1 Missing 0.019500 5 0.0975 0.4000 ROD.A78B2 Missing 0.012000 5 0.0600 0.4000 RQTL7.R7B2 0.25 0.119717 1.5 0.1796 0.8000 RQTL8.R7B2 0.25 0.119717 1.5 0.1796 0.8000 RQTL9.R7B1 0.50 0.239435 1.5 0.3592 0.8000 RQTL9.R7B2 0.50 0.239435 1.5 0.3592 0.8000 RQTL10.R7B1 0.25 0.119717 1.5 0.1796 0.8000 RQTL10.R7B2 0.25 0.119717 1.5 0.1796 0.8000 RQTL11.R7B1 0.25 0.119717 5 0.5986 0.8000 RQTL11.R7B2 0.25 0.119717 5 0.5986 0.8000 RQT12.R7B1 0.25 0.028258 5 0.1413 0.4000 RQT12.R7B2 0.25 0.028258 5 0.1413 0.4000 RQT13.R7B1 0.25 0.028258 5 0.1413 0.4000 RQT13.R7B2 0.25 0.028258 5 0.1413 0.4000
Special tests during powering test campaign • Reiner Denz, 25.02.2013:We will try to get the following circuits ready for test (+-800 mV , 20 ms , no compensation, constant threshold over the whole current range):RQTL9.L3B1/B2, RQTL9.R3B1/B2Should be ready for Wednesday (27.02.2013) afternoon.
U_th = U_res! • Input Zinur: the calculated U_th corresponds to an actual resistive voltage; the thresholds cannot be applied as such in a detection system without inductive compensation! • Conclusion Reiner: In this case no special tests during the Feb 2013 powering campaign.
RCBXH/V – postponed • Preliminary results: • threshold increase for faster ramp rates ok for magnet and wire between coils and splices (40 cm) • busbar protection needs additional studies. Large increase in thresholds unlikely due to lack of energy-extraction.
