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Field quality in correctors: Episode III

MEL. Field quality in correctors: Episode III. Update on warm magnetic measurements of lattice correctors V. Remondino. FQWG 3/5 2005, V. Remondino AT/MEL. MEL. Introduction. As only lattice correctors are concerned, we do not consider MCDOs & MCSs (~3700 magnets)

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Field quality in correctors: Episode III

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  1. MEL Field quality in correctors: Episode III Update on warm magnetic measurements of lattice correctors V. Remondino FQWG 3/5 2005, V. Remondino AT/MEL

  2. MEL Introduction • As only lattice correctors are concerned, we do not consider MCDOs & MCSs (~3700 magnets) • Reminder: we measure modules and not the final correctors • Only data stored in MTF (Oracle WMM table ) are taken into account (no preliminary data from modules approval) • We concentrate mainly on the dispersion of the Transfer Functions for the SSS correctors

  3. MOs: Transfer Function 289 modules analyzed

  4. MOs: Transfer Function

  5. MOs: Transfer Function  = 0.27 %

  6. MOs: Histograms (phase & alignment)

  7. MOs: Normal Harmonics

  8. MOs: B1 Modules in Fast-Track included

  9. MOs: Normal Harmonics MOs:

  10. MOs: Skew Harmonics

  11. MOs: Skew Harmonics

  12. MOs: Summary

  13. MSMs: Transfer Function 441 modules analyzed

  14. MSMs: Transfer Function 441 modules analyzed  = 0.33 %

  15. MSMs: Histograms (phase & alignment)

  16. MSMs: Normal Harmonics

  17. MSMs: Normal Harmonics

  18. MSMs: Skew Harmonics

  19. MSMs: Skew Harmonics

  20. MSMs: Summary

  21. MQTs: Transfer Function 88 modules analyzed

  22. MQTs: Transfer Function  = 0.23 %

  23. MQTs: Histograms (phase & alignment)

  24. MQTs: Normal Harmonics

  25. MQTs: Normal Harmonics

  26. MQTs: Skew Harmonics

  27. MQTs: Summary

  28. MCBMs: Transfer function 397 correctors analyzed

  29. MCBMs: Transfer function 397 modules analyzed  = 0.33 %

  30. MCBMs: Normal harmonics

  31. MCBMs: Skew harmonics

  32. MCBMs: Summary

  33. Conclusions - modulus • The measured systematic of the modulus is often out of the limits scaled at low current (but this is not a problem) • The measured sigma on the modulus is < 0.33 % for all correctors: this satisfies the specifications, with the exception of MCBMs, for which a  of 0.02 % was specified

  34. Conclusions - Phase • The phase is not a issue as it can be easily corrected modifying the ‘keys’

  35. Conclusions : Alignment • During the construction, modules are aligned with particular care. Measurements show that we are within tolerances. • At the beginning of the production, MQTs were out of specs. Now the situation is under control.

  36. Conclusions: Harmonics • Recently, we observed a jump in the trend of the low harmonics (b1, b2, a1, a2 too high) in MOs. • The coil manufacturing process has been modified in order to solve this problem. Measurements on last modules show that harmonics are back to usual values. • Part of this ‘bad’ production has been rejected or is in stand-by. However, we decided to accept most of the modules after discussion with A. Lombardi.

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