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FIELD QUALITY IN THE INNER TRIPLET AND IN THE SEPARATION DIPOLE

Frascati , 14 th November 2012* WP2-WP3 joint meeting. FIELD QUALITY IN THE INNER TRIPLET AND IN THE SEPARATION DIPOLE. E. Todesco With contributions from Q. Xu , X. Wang, G. L. Sabbi , T. Nakamoto

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FIELD QUALITY IN THE INNER TRIPLET AND IN THE SEPARATION DIPOLE

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  1. Frascati, 14th November 2012* WP2-WP3 joint meeting FIELD QUALITY IN THE INNER TRIPLET AND IN THE SEPARATION DIPOLE E. Todesco With contributions from Q. Xu, X. Wang, G. L. Sabbi, T. Nakamoto *Revised version on November 27: correction of sign of persistent current component of b6 and b10 in page 4 and 7

  2. TRIPLET: RANDOM • Random component dominated by coilgeometry (position of the cables) • Based on the experience of the previousprojects: randomdisplacement w.r.t. nominal of s=30 mm • Four times larger for the allowed Amplitude of displacement corresponding to measured random components [B. Bellesia et al., Phys Rev. STAB 10 062401 (2007)]

  3. TRIPLET: RANDOM • Random component dominated by coilgeometry (position of the cables) • Previousestimatewasbased on rescaling of estimates for 120 mm case (MQXC) – smalldifferences • Same values assumed for uncertainty Field quality estimate V1 (June 2012) based on MQXC, P. Fessia, et al., IEEE Trans. Appl. Supercond. 20 (2010) 140 Field quality estimates V2 (November 2012) by X. Wang, based on MQXF 150 mm aperture cross-section by P. Ferracin, F. Borgnolutti, H. Felice

  4. TRIPLET: SYSTEMATIC • We have four blocks  wideability of tuningfieldquality • Large saturation for b6: 3.2 units – corrected by the geometric • At injection we assume -20 units of persistent current • This is a first guessfrom HQ, but thereis a strongdependenceon filament size, cycle, and magnet

  5. SEPARATION DIPOLE D1: RANDOM • Random component dominated by coilgeometry (position of the cables) • Based on the experience of the previousprojects: split the randomdisplacement by familygiving a s of displacement in eachfamily • We use the LHC MB case (samecable – but twolayers and 2-in-1) • RHIC (one layer) givessimilar values Amplitude of displacement corresponding to measured random components [B. Bellesia et al., Tenth European Particle Accelerator Conference (2006) 2601-3)]

  6. SEPARATION DIPOLE D1: RANDOM • Random component dominated by coilgeometry (position of the cables) • Based on the experience of the previousprojects: split the randomdisplacement by familygiving a s of displacement in eachfamily

  7. SUMMARY: TRIPLET

  8. SUMMARY: D1

  9. CONCLUSIONS • Weproposedverychallengingfieldqualityestimates for the inner triplet and D1 • The best wecanexpect – itwillbeprobablyworse • To improve: magneticshimming to correct non allowedlargermultipoles • Hypothesis: • Fine filaments • Coredcable (no ramp rate effects) • Sameability of coilpositioning as in Nb-Ti • Comingsoon : Q4 and (a bit later) D2

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