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Table 3 rms gradient errors used in all simulations presented in this paper. Note that values are not tolerance specifications, as there is an ongoing iterative process to determine the field precision achievable and the acceptable machine performance

From: Alignment & stability challenges for FCC-ee

Type

Field Errors

Arc quadrupole

Δk/k = 2 × 10−4

Arc sextupoles

Δk/k = 2 × 10−4

Dipoles

ΔB/B =1 × 10−4

IR quadrupole

Δk/k = 1 × 10−4

IR sextupoles

Δk/k = 2 × 10−4