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RCO.A45B1 Circuit of 77 octupole spool pieces in MBA dipoles (part of combined MCOD )

RCO.A45B1 Circuit of 77 octupole spool pieces in MBA dipoles (part of combined MCOD ) 120 A circuit using a 120 A converter (RPLB type) with QPS input (exceptionally) 3 events: 11 Feb 2011 00h24 13 Feb 2011 00h59 13 Feb 2011 16h59. See also presentation Markus on the RSS.A78B1.

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RCO.A45B1 Circuit of 77 octupole spool pieces in MBA dipoles (part of combined MCOD )

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  1. RCO.A45B1 Circuit of 77 octupole spool pieces in MBA dipoles (part of combined MCOD) 120 A circuit using a 120 A converter (RPLB type) with QPS input (exceptionally) 3 events: 11 Feb 2011 00h24 13 Feb 2011 00h59 13 Feb 2011 16h59 See also presentation Markus on the RSS.A78B1 A. Verweij, 8 March 2011, MP3 mini workshop

  2. A. Verweij, 8 March 2011, MP3 mini workshop

  3. EVENT 1: 20110211 00h24m24s. While at 100 plateau, sudden increase in current with 5 A/s causing QPS to trip. A. Verweij, 8 March 2011, MP3 mini workshop

  4. Strong noise in V_meas and V_ref already present during 100 s before the trip A. Verweij, 8 March 2011, MP3 mini workshop

  5. Error in current rather small (<2 mA) until noise starts. A. Verweij, 8 March 2011, MP3 mini workshop

  6. EVENT 2: 20110213 00h58m38s. While at 100 A plateau, sudden increase in current with 5 A/s causing QPS to trip. A. Verweij, 8 March 2011, MP3 mini workshop

  7. Strong noise in V_meas and V_ref already present during 50 s before the trip A. Verweij, 8 March 2011, MP3 mini workshop

  8. Error in current rather small (<2 mA) until noise starts. A. Verweij, 8 March 2011, MP3 mini workshop

  9. EVENT 3: 20110213 16h59m31s. While ramping up, sudden increase in current (from 1.5 A/s to 6.5 A/s) causing QPS to trip. A. Verweij, 8 March 2011, MP3 mini workshop

  10. Noise in V_meas and V_ref already starting 4 s before the trip A. Verweij, 8 March 2011, MP3 mini workshop

  11. Error in current rather small (<2 mA) until noise starts. A. Verweij, 8 March 2011, MP3 mini workshop

  12. LHC Circuit • Connections • badly Screwed TOGETHER • analyze https://edms.cern.ch/file/1131600/1/LHC-bad-connexion-signature.pptx • CERN • Yves Thurel, 7 March 2011 A. Verweij, 8 March 2011, MP3 mini workshop

  13. Conclusion from EPC • A connection badly screwed together: • Is not easy to detect in operation: no huge I.error expected, and very long period of very acceptable errors • Will not obviously be detected by a increase of the cable resistance (sometimes it decreases with time). • Is erratic and can disappear for very long period. • Analyzing it on a particular event: • Vmeas is the best curve to be used, even if low sample rate. • Keep in mind that V.meas observed is equal to V.ref and is never a loose event, but is always the loop reaction. • Detection elsewhere in the machine: see presentation Markus A. Verweij, 8 March 2011, MP3 mini workshop

  14. Non conformity opened on 13 Feb, and closed on 4 March A. Verweij, 8 March 2011, MP3 mini workshop

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