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MP3 status week 31

MP3 status week 31. N. Catalan Lasheras. Monday 3th August. Beam dump triggered by QPS without any clear reason The trip was caused by a circuit breaker spontaneous opening in the crate controlling 18L3 detector. Intervention required. Sunday 1 st August.

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MP3 status week 31

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  1. MP3 status week 31 N. Catalan Lasheras MP3: August 4th 2010

  2. Monday 3th August • Beam dump triggered by QPS without any clear reason • The trip was caused by a circuit breaker spontaneous opening in the crate controlling 18L3 detector. Intervention required NCL – MP3 4th August 2010

  3. Sunday 1st August • Beam dump caused by RB.A56 trip due to a water fault in the converter • Fuse in the converted broken • Changed by EPC • QPS EE switch A1 opened. Probably a false flag. • Fault cleared after reopening the switches NCL – MP3 4th August 2010

  4. Saturday 31 July • Beam dump due to RQTD, RQTF trips after re-enabling the tune feedback at flat-top • Happened several times. Not really a circuit fault NCL – MP3 4th August 2010

  5. Tuesday 27 July • RCBXH1.R2 U_res signal with a significant offset tripped during pre-cycle • Required an access at 02:00 to be reset from the tunnel NCL – MP3 4th August 2010

  6. Tuesday 26th July • Two beam dumps triggered by IPQs involving heater discharges • RQ9.R2 at 08:59:28 • RQ6.R1 at 13:39:36 • Both discharged were ok but the reasons for the discharge are still unknown. NCL – MP3 4th August 2010

  7. Monday 26th July • Access granted with current in the main circuits NCL – MP3 4th August 2010

  8. IPQs bus-bar resistance measurements • Measurement of bus-bar resistance for the 6kA circuits • Reference values for time evolution and nQPS upgrade • Already 14 magnets measured in the dispersion suppressor • All values around 5 nOhms. • Measurements require special equipment displaced and connected during the technical stops. • Reduced hardware commissioning required NCL – MP3 4thAugust 2010

  9. Q10-Q9 sensitivity (to storms) • Special configuration applied to these magnets to measure higher range voltage • Poor resolution on the low voltage range • High sensitivity to noise of the triggering signal • Restoring he nominal settings will imply removing two resistors for each card. • MP3 recommended to test in the lab and implement 1-2 examples during the next technical stop. NCL – MP3 4th August 2010

  10. New support mode from MP3 • Two persons on call for LHC operation • 7:00 to 19:00 on weekdays • 19:00 to 7:00 on weekdays and 24/24 on weekends • Assistance to the 8:30 and 9:00 meetings • Close follow-up of the LHC operation (similar to the machine supervisors) • Shifts (afternoon and night) will be organized after technical stops x162266 NCL – MP3 4th August 2010

  11. New support mode from MP3 • Hardware procedures and test plan for next shutdown under revision • New tools on preparation • New interlocks that may lock the circuits after automatic analysis of the data • Same commitment of the MP3 members but resource optimization • Already in this mode for the last week NCL – MP3 4th August 2010

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