Is a laser "wire" a non-invasive method?
V.I. Telnov (Institute of Nuclear Physics, Novosibirsk, Russia)
TL;DR
This paper investigates the effects of a focused laser beam used for electron beam diagnostics, revealing that electrons receive kicks proportional to the laser field, which are typically negligible in practice.
Contribution
The study clarifies the actual impact of laser wires on electron beams, challenging the assumption that they are entirely non-invasive.
Findings
Electrons receive kicks proportional to laser field intensity.
The kicks are inversely proportional to beam energy.
In practical diagnostics, these effects are negligible.
Abstract
A tightly focused laser beam (laser wire) is used for measurement of transverse electron beam sizes in storage rings and linear colliders. It is assumed that the laser beam does nothing with the electron beam except Compton scatterings which happen with a rather small probability. In reality, electrons crossing the laser beam get kicks (with 100 % probability) proportional to the square of the laser field and inversely proportional to the beam energy. In practical cases of beam diagnostics this effect is negligible.
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