2016/07/19 by M. Koratzinos, A. Blondel, Koratzinos, M. +15 · 1 citation
Engineering · #Particle accelerators and beam dynamics #Superconducting Materials and Applications #Particle Accelerators and Free-Electron Lasers
paper · pdf · doi:10.48550/arxiv.1607.05446
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 betay* 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.