J. García, F. Toral (CIEMAT) P. Fessia (CERN) Single Aperture Orbit Corrector: Progress on MCBXFB design Field Quality Report February, 19th 2015 J. García, F. Toral (CIEMAT) P. Fessia (CERN)

Index MCBXFB & MCBXFA: MCBXFA Base iron vs Iron outer diam. = 614 mm: Cross Sections. Field quality at 100% IN. Integrated Sextupoles variation with current. MCBXFA Base iron vs Iron outer diam. = 614 mm: Cross sections Conclusions

MCBXFB & MCBXFA

Cross sections MCBXFB MCBXFA

Field quality at 100% IN Field quality achieved, except for the sextupoles caused by iron saturation. Results below corresponding to 100% IN on both dipoles, iron & cryostat included. Same cross section and coil ends in both magnets. Inner Dipole (ID) & Outer Dipole (OD) parameters Units MCBXFB (Short Magnet) MCBXFA (Long Magnet) Inner dipole current A 1600 Integrated field B1 (ID) T 2.49 4.63 Integrated b3 units 17.37 -13.78 Integrated b5 -1.49 Integrated b7 0.62 1.02 Integrated b9 -0.75 0.056 Integrated b11 3.6 4.38 Outer dipole current 1470 Integrated field A1 (OD) 2.52 4.58 Integrated a3 -10.33 47.52 Integrated a5 -3.6 5.43 Integrated a7 -3.26 -3.86 Integrated a9 -0.58 -0.63 Integrated a11 0.12 0.02

Integrated sextupoles variation with the current It is not possible to centre the sextupoles variation simultaneously on both magnets with the same cross section and coil ends. Shifting a MCBXFB sextupole moves that sextupole in the same direction for MCBXFA.

MCBXFA Base iron vs Iron outer diam. = 614 mm

Cross sections MCBXFA (Base Iron) MCBXFA (Iron Outer Diam. = 614 mm)

Integrated sextupoles variation with the current Increasing the outer iron diameter reduces the saturation problems. The variation of a3 with the current is much lower for the thicker iron case.

Conclusions

Conclusions It is not possible to centre the sextupoles variation simultaneously on both magnets using the same cross section and coil ends. An increase of the outer iron diameter in MCBXFA reduces the saturation problems, leading to lower sextupoles variation with the current. Studying a narrower operation range for the magnet would allow to optimize sextupole values on critical operation points.