Speaker
Description
The layout of the FCC-ee collider requires the separa-
tion of the electron and positron beams, which are circu-
lating in opposite directions, on either side of the RF sys-
tem. Only one of the two beams must be deflected, while
the other one (the beam circulating in the direction of the
RF) shall remain untouched to avoid synchrotron radiation
being emitted toward the RF section. This functionality
is achieved using a combination of an electric field and a
perpendicular magnetic field, which must be matched to
each other along the entire length of the separator to avoid
synchrotron radiation (SR) emission toward the supercon-
ducting RF cryomodules. In order to satisfy the matching
condition ๐ต = ๐ธ/๐ for relativistic particles, an extremely
weak magnetic field (5 mT) is required for a given achiev-
able static electric field (1.5 MV/m). This article presents a
separator concept that combines an under-vacuum electro-
static system with a low-field large-aperture outside-vacuum
dipole magnet to achieve the main separation functionality
while providing excellent field matching and low SR produc-
tion. In addition to the concept development, three critical
aspects have been identified and are the subject of ongoing
studies to assess feasibility by end of 2027: high-voltage
(HV) breakdown, beam coupling impedance and machine
protection.
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