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The FCC-ee Interaction Region Magnet Design

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arxiv 1607.05446 v1 pith:GK76GZ2M submitted 2016-07-19 physics.acc-ph

The FCC-ee Interaction Region Magnet Design

M. Koratzinos , A. Blondel (University of Geneva , Geneva , Switzerland) , A. Bogomyagkov , S. Sinyatkin (BINP SB RAS , Novosibirsk , Russia)
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M. Benedikt B. Holzer J. van Nugteren F. Zimmermann (CERN K. Oide (KEK Tsukuba Japan)
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classification physics.acc-ph
keywords detectorregioninteractionshouldbeamsdesignfcc-eefinal
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The design of the region close to the interaction point of the FCC-ee experiments is especially challenging. The beams collide at an angle (+-15 mrad) in the high-field region of the detector solenoid. Moreover, the very low vertical beta_y* of the machine necessitates that the final focusing quadrupoles have a distance from the IP (L*) of around 2 m and therefore are inside the main detector solenoid. The beams should be screened from the effect of the detector magnetic field, and the emittance blow-up due to vertical dispersion in the interaction region should be minimized, while leaving enough space for detector components. Crosstalk between the two final focus quadrupoles, only about 6 cm apart at the tip, should also be minimized.

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    A weak-focusing lattice with many short cells and CCT magnets yields a model 3 GeV storage ring of 400-500 m circumference with 50 pm horizontal emittance and large 6D dynamic aperture.