Abstract
The LHeC is envisioned as a natural upgrade of the LHC that aims at delivering an electron beam for collisions with the existing hadronic beams. The current baseline design for the electron facility consists of a multipass superconducting energy-recovery linac (ERL) operating in a continuous wave mode. The unprecedently high energy of the multipass ERL combined with a stringent emittance dilution budget poses new challenges for the beam optics. Here, we investigate the performances of a novel arc architecture based on a flexible momentum compaction lattice that mitigates the effects of synchrotron radiation while containing the bunch lengthening. Extensive beam-dynamics investigations have been performed with PLACET2, a recently developed tracking code for recirculating machines. They include the first end-to-end tracking and a simulation of the machine operation with a continuous beam. This paper briefly describes the Conceptual Design Report lattice, with an emphasis on possible and proposed improvements that emerged from the beam-dynamics studies. The detector bypass section has been integrated in the lattice, and its design choices are presented here. The stable operation of the ERL with a current up to similar to 150 mA in the linacs has been validated in the presence of single- and multibunch wakefields, synchrotron radiation, and beam-beam effects.
Highlights
Two of the initially proposed options for the LHeC, the Linac Ring and the Ring Ring, both offered comparable performances
The Linac Ring has recently been selected as the baseline; the choice was mainly based on minimizing interference with the LHC operation
The beamdynamics studies pointed out a number of possible improvements of the energy-recovery linac (ERL) design which will be discussed in this paper
Summary
Two of the initially proposed options for the LHeC, the Linac Ring and the Ring Ring, both offered comparable performances. In order to reach the collision energy of 60 GeV, the electrons are recirculated three times. Beams of different energies are directed into different recirculation arcs via beam spreaders or recombiners, which introduce or remove vertical separation at each end of the linacs. Its energy is released into the rf and used to accelerate the fresh beam This allows one to increase the beam current and. Such a high luminosity, 250 times the one previously achieved at HERA [3], allows one to employ the LHeC as a Higgs factory [4]. It should be noted that the initial stage may use more conservative parameters, in particular, a factor of 4 smaller beam current
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