Abstract
Tuning of the final-focus system of a linear ${e}^{\ensuremath{-}}{e}^{+}$ collider is a challenging problem due to the strong nonlinearities of the system and small transverse beam sizes at the interaction point. To have reliable performance of a collider, nominal luminosity must be reached quickly under a set of various imperfections. Measuring luminosity at high energies is a nontrivial task, and, to get a precise measurement, many collisions must be sampled. Therefore, it is desirable to use other beam-beam signals for faster tuning. This paper studies the use of beamstrahlung and incoherent pairs in an extensive simulation study including static imperfections. Tuning results of the nominal lattice are compared to an updated lattice with a smaller vertical beam size at the interaction point. Finally, recovery time after machine downtime and misalignment of components due to ground motion is also studied.
Highlights
The Compact Linear Collider (CLIC) [1,2,3] is a proposed linear electron-positron collider at CERN
To reach the nominal luminosity of 1.5 × 1034 cm−2 s−1, CLIC relies on nanometer beam sizes at the interaction point (IP)
CLIC is foreseen to be built in three energy stages ranging from 380 GeV to 3 TeV
Summary
The Compact Linear Collider (CLIC) [1,2,3] is a proposed linear electron-positron collider at CERN. To reach the nominal luminosity of 1.5 × 1034 cm−2 s−1, CLIC relies on nanometer beam sizes at the interaction point (IP). This puts tight constraints on emittance preservation along the whole machine, and imperfections causing emittance growth must be mitigated. CLIC is foreseen to be built in three energy stages ranging from 380 GeV to 3 TeV. The emittances at the end of the main linac assume that all the upstream sections (ring-to-main-linac transfer and main linac) use all of their emittance budgets. Since it is likely that the emittance growth from the upstream sections is smaller than that, this scenario is somewhat pessimistic
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