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MP3 report – week 16 12/4/2010 – 18/04/2010 14 interventions (up to 19/04 2h00)

MP3 report – week 16 12/4/2010 – 18/04/2010 14 interventions (up to 19/04 2h00). MP3/QPS team in CCC. Undulator trip (RU.L4) on Wednesday (Again).

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MP3 report – week 16 12/4/2010 – 18/04/2010 14 interventions (up to 19/04 2h00)

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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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