On the energy spectrum evolution of electrons undergoing radiation cooling

Novel signatures of radiation reaction in electron–laser sidescattering

“…An often studied phenomenon of radiation reaction is the loss of energy of high-energy particles interacting with strong electromagnetic fields, such as ultra-strong laser fields [18,19]. This is often discussed as beam cooling for electron-beam laser collisions [20][21][22] and can even lead to population inversions in strong electromagnetic fields [23]. The effect of electron-beam properties on laser-based radiation reaction experiments was studied in detail in [24].…”

“…Here m is the electron mass, e is the elementary charge, p µ is the electron's four momentum and F µν is the electromagnetic field strength tensor. In the quantum regime, the stochastic nature of photon emission becomes a significant factor which causes a spreading (heating) of the particle's energy distributions [20,22,[29][30][31]. Electron-laser collisions in this regime have been proposed as an opportunity to generate bright γ-ray flashes [32][33][34][35].…”

“…Electron-laser collisions in this regime have been proposed as an opportunity to generate bright γ-ray flashes [32][33][34][35]. Analytical solutions for moments of the particle distribution have been recently found in [22,36]. The influence of the electron spin on quantum radiation reaction effects has recently been studied from kinetic equations in [37].…”

“…In the quantum radiation reaction regime one expects also additional angular spreading [22,[38][39][40][41] accompanying the particle heating. The control of the electron deflection in head-on collisions due to radiation reaction was proposed in [42,43].…”