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FCC-ee optics tuning WG meeting
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CERN
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FCC-ee optics tuning WG meeting
J. Keintzel reminds that the deadline of the FSR is 3 February.
A. Hussain presents updates on multipole tolerances (b3, b4, b5) on arc dipoles. Tune and chroma are matched. Simulations are performed for injection parameters. 2 injection schemes are studied: 0.85% energy offset and 1.5mm horizontal offset OR 0.95% energy offset. The first option is a bit more tolerable for multipole errors. The idea is to have less than 10% offset. G. Roy comments that the losses could stem either from the field errors or not optimized DA/MA and suggests to scale it to the value from injection without errors.
C. Goffing presents updates on BBA for FCC. He assumes separte horizontal and vertical orbit correctors next to quadrupoles (misaligned by 100 µm). BPM noise is 1 µm. Sextupoles do not spoil the final accuracy of BBA. The achieved rms is well below 20 µm in all cases. Furtermore, he presents results from a second BBA campaign at KARA. M. Boland suggests to look into the noise of the vairous BPMs or possible non-linearities.
S. Liuzzo reminds that a post-doc position for FCC tuning is open at ESRF.
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