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Weekly Report: QPS Team Meeting Summary – April 19, 2010

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In the Monday Morning Meeting on April 19, 2010, the QPS team discussed several key issues regarding undulator trips, beam-induced quenches, and power supply adjustments. Notable incidents included multiple trips of the skew quadrupole during squeezes due to steep current-ramp requests. The meeting emphasized the importance of resetting procedures and fine-tuning circuit limits to ensure system reliability. The team also reviewed other reported issues since April 12, including communication glitches and the impact of noise on circuits, with necessary adjustments proposed for future stability.

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Weekly Report: QPS Team Meeting Summary – April 19, 2010

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  1. MP3 report – week 16 12/4/2010 – 18/04/201014 interventions (up to 19/04 2h00) MP3/QPS team in CCC Monday Morning Meeting : 19th of April 2010

  2. Undulator trip (RU.L4) on Wednesday (Again) • To be reset but at 0 current and not simply stable current ; also with low current in the mains. Fix: include reset in combo together with the ramp down of the undulator Trip Reset Monday Morning Meeting : 19th of April 2010

  3. Undulator trip RU.L4 • Long term behaviour : since 1st of April. Is it still drifting ? Trip due to drift AND SPIKES 100 mV threshold Monday Morning Meeting : 19th of April 2010

  4. Skew quadrupole trips during squeeze • RQS.A78B2 (17/04) tripped 3 times due to steep current-ramp requests. • RQS.A56B2 (16/04) tripped once for the same reason • QPS inductive compensation does not have time to react. • V_REF translates directly into U_RES which goes above threshold. • Functions need to be adjusted / smoothened. Monday Morning Meeting : 19th of April 2010

  5. (Extended) DS (tuning) trim quadrupole • RQTL11.R2B1 :(15/04) : To squeeze @ 2m @IR2, it needed to be powered to 302 A - limit was increased from 200 A to 320 A ; the circuit was commissioned to 550 A. The limitation came from a possible lack of quench protection in case of loss of communication. • Similarly : RQT.13L8B1 (11/04) : To squeeze @ 2m @IR8, it needed to be powered to 352 A - limit was increased from 300 A to 352 A ; the circuit was commissioned to 550 A. The limitation came from the same reason. • This should not happen anymore in 2010 :“The successful squeeze to 2 m everywhere today should mark the full exploration of the operational settings space for this year” M. Lamont Monday Morning Meeting : 19th of April 2010

  6. Other MP3 issues since 12th of April 2010 (1/2) • RB.A67: (14/04) : 1 QH power supply to be replaced (MB.B8L7) Can be tolerated temporarily @ 3.5 TeV Solved by QPS stand-by during access on 16/04. Recharged QH Discharged QH Intervention Monday Morning Meeting : 19th of April 2010

  7. Beam-Induced Quench • 4 magnets quenched by beam losses. • 1 magnet quenched by quench heaters from symmetric quench protection. • Comparable event on Nov. 20, 2009 (as recalled precisely by J. Wenninger). U_thres. 18/04/10 20/11/09 Monday Morning Meeting : 19th of April 2010

  8. Other MP3 issues since 12th of April 2010 (2/2) • Some trips of circuits that were repowered after analysis: • RQTD.A56B1, RQ4.R5B1 (12/04) • RCBV12.L4B1 (12/04), RCBV17.L1B1 (13/04): Solved by EPC during access on 16/04 • RQX.L8 (12/04) : communication between PIC & SIS: solved • RQT13.L6B2, RQT4.L3 [Warm circuit], RCBCH7.L3B2 (16/04) To be investigated (EPC?) : now working fine • RCBH19.L3B2 & RCBV19.L3B1 : Seems to have a PC issue EPC informed Monday Morning Meeting : 19th of April 2010

  9. Other MP3 issues since April 19th • Sector 78 tripped due to noisy card of nQPS (B11R7 - RQF) • Sector 81 tripped due to a noisy card of nQPS (B22L1 – RQF) • Threshold was increased to 600uV on both, until next technical stop Monday Morning Meeting : 19th of April 2010

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