Abstract
Physics considerations for a next-generation linear collider based on laser-plasma accelerators are discussed. The ultrahigh accelerating gradient of a laser-plasma accelerator and short laser coupling distance between accelerator stages allows for a compact linac. Two regimes of laser-plasma acceleration are discussed. The highly nonlinear regime has the advantages of higher accelerating fields and uniform focusing forces, whereas the quasilinear regime has the advantage of symmetric accelerating properties for electrons and positrons. Scaling of various accelerator and collider parameters with respect to plasma density and laser wavelength are derived. Reduction of beamstrahlung effects implies the use of ultrashort bunches of moderate charge. The total linac length scales inversely with the square root of the plasma density, whereas the total power scales proportional to the square root of the density. A 1 TeV center-of-mass collider based on stages using a plasma density of ${10}^{17}\text{ }\text{ }{\mathrm{cm}}^{\ensuremath{-}3}$ requires tens of $J$ of laser energy per stage (using $1\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$ wavelength lasers) with tens of kHz repetition rate. Coulomb scattering and synchrotron radiation are examined and found not to significantly degrade beam quality. A photon collider based on laser-plasma accelerated beams is also considered. The requirements for the scattering laser energy are comparable to those of a single laser-plasma accelerator stage.
Highlights
Advanced acceleration techniques are actively being pursued to expand the energy frontier of future colliders
The minimum energy of interest for the lepton collider will be determined by high-energy physics experiments that are presently underway, it has long been anticipated that ! 1 TeV center-of-mass energy will be required [1,2]
Laser-plasma acceleration is realized by using a short-pulse, high-intensity laser to ponderomotively drive a large electron plasma wave in an underdense plasma
Summary
Advanced acceleration techniques are actively being pursued to expand the energy frontier of future colliders. Laser-plasma acceleration is realized by using a short-pulse, high-intensity laser to ponderomotively drive a large electron plasma wave (or wakefield) in an underdense plasma. Employing LPA technology has the potential to significantly reduce the main linac length (and, the cost) of a future lepton collider [6,7]. Rapid progress in the field of laser-plasma acceleration, and in particular the demonstration of high-quality GeV electron beams using cm-scale plasmas at Lawrence Berkeley National Laboratory [8,9], has increased interest in laser-plasma acceleration as a path toward a compact TeV-class linear collider. We focus on the main LPA-based linacs Other collider components, such as the injector (and cooling systems) and beam delivery to the interaction point, are not addressed in this work
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