Abstract
The interaction region layout for the ${e}^{+}{e}^{\ensuremath{-}}$ future circular collider FCC-ee is presented together with a preliminary estimate of synchrotron radiation that affects this region. We describe in this paper the main guidelines of this design and the estimate of synchrotron radiation coming from the last bending magnets and from the final focus quadrupoles, with the software tools developed for this purpose. The design follows the asymmetric optics layout as far as incoming bend radiation is concerned with the maximum foreseen beam energy of 175 GeV and we present a feasible initial layout with an indication of tolerable synchrotron radiation.
Highlights
The future circular collider (FCC-ee) is a very challenging machine with unprecedented high eþe− beam energy, luminosity and circumference
We describe in this paper the main guidelines of this design and the estimate of synchrotron radiation coming from the last bending magnets and from the final focus quadrupoles, with the software tools developed for this purpose
This machine will work at different beam energies, from 45.6 GeV up to 175 GeV, with a luminosity that goes from 2.1 × 1036 cm−2 s−1 for the lower energy to 1.3 × 1034 cm−2 s−1 for the highest one
Summary
The future circular collider (FCC-ee) is a very challenging machine with unprecedented high eþe− beam energy, luminosity and circumference. In order to combine the two requests of a large crossing angle and the need to prevent high energy SR fans from going into the interaction point (IP), the IR optics have been designed asymmetrically so that the incoming beam from both sides. The displacement of the FCC-ee IP with respect to the FCC-hh central trajectory is 9.4 m and the maximum displacement between the two machines is 11.9 m which is located about 400 m from the IP The size of this displacement is inversely proportional to the critical energy of the last upstream bend magnet for a given crossing angle collision. For the top energy design, QC1 is 3.2 m long, QC2 is 2.5 m and their gradients are 97 T=m and 61.5 T=m, respectively
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