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PS main magnetic units

This study investigates the limits, multipoles, and symmetries of a simulation framework for magnetic units. It also examines the dipolar response to pulsed field windings and the hysteresis and dynamic effects of magnetic fields.

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PS main magnetic units

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  1. PS main magnetic units F. Sperati, D. Schoerling, A. Beaumont, M. Serluca, G. Sterbini

  2. Outlook • 2015 • Simulation framework – Limits (1) • New tune investigation • 2016 • Simulation framework – Limits (2) • Simulation framework – Multipoles and symmetries • Dipolar response to PFW • Hysteresis and dynamic effect of B • 23/03/2017

  3. Outlook • 2015 • Simulation framework – Limits (1) • New tune investigation • 2016 • Simulation framework – Limits (2) • Simulation framework – Multipoles and symmetries • Dipolar response to PFW • Hysteresis and dynamic effect of B • 23/03/2017

  4. Simulation framework – Limits2015 • FEM model to represent real magnets • Validity check: comparing with measurements (bare machine) • Simulation: magneto-static • Conclusions: • Good prediction on dipoles and quadrupoles (= 1%) • Good guideline for B3 • 23/03/2017 Straight model!

  5. Outlook • 2015 • Simulation framework – Limits (1) • New tune investigation • 2016 • Simulation framework – Limits (2) • Simulation framework – Multipoles and symmetries • Dipolar response to PFW • Hysteresis and dynamic effect of B • 23/03/2017

  6. New tune investigation2015 • Bare machine, injection point • Tune increase to avoid resonances • Current tune: • New tune: • 23/03/2017 Image courtesy of R. Wasef

  7. New tune investigation2015 • MADX: • Simulations: Find Impose conditions on multipoles (MADX values) Solve system (Obtain currents) Cross check in CCC Current situation: previous presentation (“7/7 optics”, M. Serluca) 23/03/2017

  8. Outlook • 2015 • Simulation framework – Limits (1) • New tune investigation • 2016 • Simulation framework – Limits (2) • Simulation framework – Multipoles and symmetries • Dipolar response to PFW • Hysteresis and dynamic effect of B • 23/03/2017

  9. Simulation framework – Limits2016 • POPS  Magnetic model (Opera 3D)   MADX  • POPS  PS  CCC  • : 1% relative error (B2) • : no match (B3) • Multipoles calculated with reference radius, but not in MADX! • 23/03/2017 multipolar representation: under discussion! 9

  10. Outlook • 2015 • Simulation framework – Limits (1) • New tune investigation • 2016 • Simulation framework – Limits (2) • Simulation framework – Multipoles and symmetries • Dipolar response to PFW • Hysteresis and dynamic effect of B • 23/03/2017

  11. Multipoles symmetries2016 • 23/03/2017 • Study of multipoles symmetries for each circuit • Implementation in MADX of the four different blocks  resonance studies

  12. Multipoles symmetries – POPS (injection)2016 • 23/03/2017

  13. Multipoles symmetries – POPS (injection)2016 • 23/03/2017

  14. Outlook • 2015 • Simulation framework – Limits (1) • New tune investigation • 2016 • Simulation framework – Limits (2) • Simulation framework – Multipoles and symmetries • Dipolar response to PFW • Hysteresis and dynamic effect of B • 23/03/2017

  15. Dipolar response to PFW2016 • Cycle 0: 1500 Gs field, POPS controlled (602 A) • Auxiliary windings powered one by one, 50/100/150 A • 23/03/2017 • Observe field variation (BTRAIN) • Compare with 3D model

  16. Dipolar response to PFW2016 • PFW influence: Δaux= • Relative errors ~10% • 23/03/2017

  17. Outlook • 2015 • Simulation framework – Limits (1) • New tune investigation • 2016 • Simulation framework – Limits (2) • Simulation framework – Multipoles and symmetries • Dipolar response to PFW • Hysteresis and dynamic effect of B • 23/03/2017

  18. Hysteresis and dynamic effect of B2016 • LHCINDIV cycle (1.4 GeV to 26 GeV) • No auxiliary circuits • No beam • Observable: BTRAIN  dipolar component of B • Preceded by five different types of cycle: • ZERO (low energy) • SFTPRO2 (14 GeV) • TOF (20 GeV) • EAST2 (24 GeV) • LHC4 (26 GeV) • 23/03/2017

  19. Hysteresis and dynamic effect of B2016 • 23/03/2017 dB/dt=0

  20. Hysteresis and dynamic effect of B2016 • 23/03/2017 20 Gs/ms 8Gs/ms

  21. Temporary conclusions • Simulation framework – Limits: • Sextupole unreliable  chromaticity not yet predictable • Simulation framework – Multipoles symmetries: Implementation in MADX • Response to PFW: • Errors too big • Hysteresis and dynamic effect of B: Verified influence of dynamic effects • 23/03/2017

  22. PS resistor cards • Eddy currents created during ramping of the PS  magnetic field decreased and distorted • Idea: use PFW to compensate • Current situation: • Resistor cards installed on magnets • No knowledge of these cards • Two new vacuum chambers • Need of new resistor schemes • 23/03/2017 Field ramping Induced voltage in PFW loops Close loops with resistors Loop currents Compensation

  23. Spare slides

  24. Simulation framework – Limits2015 = 1% = 1% = 20%

  25. Simulation frameworkMultipoles in 3D • 23/03/2017

  26. Simulation framework – LimitsMultipoles at different reference radii • 23/03/2017

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