Abstract
The extreme electromagnetic fields sustained by plasma-based accelerators could drastically reduce the size and cost of future accelerator facilities. However, they are also an inherent source of correlated energy spread in the produced beams, which severely limits the usability of these devices. We propose here to split the acceleration process into two plasma stages joined by a magnetic chicane in which the energy correlation induced in the first stage is inverted such that it can be naturally compensated in the second. Simulations of a particular 1.5-m-long setup show that 5.5GeV beams with relative energy spreads of 1.2×10^{-3} (total) and 2.8×10^{-4} (slice) could be achieved while preserving a submicron emittance. This is at least one order of magnitude below the current state of the art and would enable applications such as compact free-electron lasers.
Highlights
Precise calculations of various electroweak reactions in pp collisions at the LHC need to account for, on top of the higher-order corrections, the effects of photoninduced processes
This suggests that at low pT, the difference is due to the smearing of dilepton transverse momentum introduced by the kT factorization approach
We propose a method that would provide an unambiguous test of the photon parton distribution at LHC energies, and allow constraints to be placed on it
Summary
Precise calculations of various electroweak reactions in pp collisions at the LHC need to account for, on top of the higher-order corrections, the effects of photoninduced processes. The relevant examples are the production of lepton pairs [1,2,3,4,5] or pairs of electroweak bosons [6,7,8,9,10,11,12,13]. A precise photon distribution inside the proton has been evaluated in Ref. We assume a collision setup from the recent p þ Pb run at the LHC, nucleon pair caprrffiiffiffieffiffidffiffi sNN out at the center-of-mass energy 1⁄4 8.16 TeV.
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