Comment on "Physics considerations for laser-plasma linear colliders" and on "Beamstrahlung considerations in laser-plasma-accelerator-based linear colliders"

TL;DR

This paper critiques proposed parameters for a plasma wakefield collider, arguing that fundamental physical interactions impose limitations on beam properties and achievable luminosities, challenging prior optimistic estimates.

Contribution

It provides a first-principles analysis disputing the feasibility of proposed collider parameters and luminosity estimates based on plasma interactions.

Findings

Fundamental plasma interactions limit beam quality.

Achievable luminosities are lower than previously suggested.

First-principles constraints challenge optimistic collider designs.

Abstract

C. B. Schroeder, E. Esarey, C. Benedetti, and W. P. Leemans {Phys. Rev. ST Accel. Beams 13, 101301 (2010) and 15, 051301 (2012)} have proposed a set of parameters for a TeV-scale collider based on plasma wake field accelerator principles. In particular, it is suggested that the luminosities greater than 10^34 cm-2s-1 are attainable for an electron-positron collider. In this comment we dispute this set of parameters on the basis of first principles. The interactions of accelerating beam with plasma impose fundamental limitations on beam properties and, thus, on attainable luminosity values.