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Twisted photons can be emitted by free electrons in circular or spiralmotion, which carry orbital angular momentum (OAM) and possess a helical phasestructure. However, classical radiation reaction (RR) effects has not beeninvestigated as an accelerated electron emits vortex radiation during theinteraction with a laser. This work focuses on investigating the effects ofradiation reaction on the production of twisted photons in the NonlinearInverse Thomson Scattering (NITS) process. Using the precise electrontrajectory obtained by Landau-Lifshitz (LL) equation with a circularlypolarized (CP) laser, we find that the radiation reaction effects can besignificant for a sufficiently long pulse of a laser. They observemodifications in the frequency, phase structure, rotational asymmetry of OAMdensity, and energy distribution of the vortex field due to radiation reaction.This finding could provide an unique signature for the detection of radiationreaction.

Radiation-reaction effects on the production of twisted photon in the nonlinear inverse Thomson scattering