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WP6B Flux Jumps New Preliminary Results + 11 T Circuit Simulation

This report presents the preliminary results of flux jumps in the 11T circuit simulation, including current loop parameters and their effect on I and Vmagnet spectra, as well as the attempt at modeling voltage perturbation and inductance jump. Comparisons are made and extrapolation to MQXF is discussed.

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WP6B Flux Jumps New Preliminary Results + 11 T Circuit Simulation

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  1. WP6B Flux Jumps New Preliminary Results+11 T Circuit Simulation Michele Martino Stefano Ierardi CERN, March 19, 2019

  2. Latest available measurement 11 T Michele Martino

  3. RPTCA.SM18.RM.G - MBHBSP109 Michele Martino

  4. RPTCA.SM18.RM.G - MBHBSP109 Michele Martino

  5. Preliminary conclusions • Current Loop parameters affect I and Vmagnet Spectra • Current Loop parameters do not seem to affect Vfj Michele Martino

  6. 11 T Proto Measurements Michele Martino

  7. MBHB11T Aperture “1” Aperture “2” Michele Martino

  8. MBHB11T Michele Martino

  9. MBHB11T Aperture “1” Aperture “2” Magnet Voltage Michele Martino

  10. MBHB11T Aperture “1” Aperture “2” Magnet Voltage Michele Martino

  11. MBHB11T Aperture “1” Aperture “2” Michele Martino

  12. First attempt at modelling Voltage Perturbation Model Inductance “Jump” Model Michele Martino

  13. Voltage Perturbation Model • Not very interesting and probably not the right one • Voltage Loop helps – results not shown here • Faster Voltage loops can, in principle, cure the problem Michele Martino

  14. Inductance Jump Model Main assumption: Flux jump is caused by a sudden decrease of the coil inductance “recovers” from one jump to another, but with a time constant much longer than the “inter-arrival” time of the flux jumps (to be confirmed) Michele Martino

  15. Inductance Jump Model is modelled by a Poisson process with an event rate is modelled by a |Gaussian| process (actual distribution not very interesting) For now the amplitude of is made independent of the current level and rate For now the jumps are low-pass filtered by a STC with a bandwidth of Michele Martino

  16. Inductance Jump Model Michele Martino

  17. Inductance Jump Model Michele Martino

  18. Inductance Jump Model – O/C Voltage Loop Michele Martino

  19. Simulation of 11 T trim circuit (two magnets) Michele Martino

  20. Inductance Jump Model – O/C Voltage Loop Michele Martino

  21. Inductance Jump Model – O/C Voltage Loop mV Michele Martino

  22. Inductance Jump Model – O/C Voltage Loop Michele Martino

  23. Inductance Jump Model – O/C Voltage Loop Michele Martino

  24. Inductance Jump Model – O/C Voltage Loop Michele Martino

  25. Inductance Jump Model – O/C Voltage Loop Michele Martino

  26. Inductance Jump Model – O/C Voltage Loop Michele Martino

  27. Inductance Jump Model – O/C Voltage Loop Michele Martino

  28. Inductance Jump Model – O/C Voltage Loop Michele Martino

  29. COMPARISONS Michele Martino

  30. COMPARISONS Michele Martino

  31. Extrapolation to MQXF Michele Martino

  32. MQXFS4b Michele Martino

  33. MQXFS4b Michele Martino

  34. MQXFS4b Michele Martino

  35. An attempt at extrapolation • Very Preliminary – just for a first “ballpark” guess • Extrapolating from 11 T circuit with 127 mH to Q1-Q2a-Q2b-Q3 series circuit with 255 mH – worst case: twice as much “noise” • Only the main circuit is considered so far for the extrapolation • Parameters of the controller not optimized at all, just a running controller with auxiliary poles at few Hz • in any case the bandwidth of the current regulation cannot be much faster as which means Michele Martino

  36. Inductance Jump Model Michele Martino

  37. Inductance Jump Model Global view at the circuit as a single magnet with Michele Martino

  38. MQXF Simulation Michele Martino

  39. MQXF Simulation Michele Martino

  40. MQXF Simulation Michele Martino

  41. MQXF Simulation Michele Martino

  42. MQXF Simulation Michele Martino

  43. MQXF Simulation Michele Martino

  44. MQXF Simulation Michele Martino

  45. Michele Martino

  46. Flux-Jumps “Spectral Signature” Harmonic + LP filter applied (stop band 200 Hz) Michele Martino

  47. Extrapolation to MQXF Michele Martino

  48. MQXFS4b Michele Martino

  49. MQXFS4b Michele Martino

  50. MQXFS4b Michele Martino

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