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Depletion of Intense Fields
D Seipt1, T Heinzl2, M Marklund3
1Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, Germany.
Physical Review Letters
|April 29, 2017
Summary
The external field approximation is invalid for multiphoton Compton and Breit-Wheeler processes when intense laser fields interact with highly charged electron bunches, causing significant laser energy depletion.
Area of Science:
- High-energy physics
- Quantum electrodynamics
- Laser-matter interactions
Background:
- Multiphoton Compton and Breit-Wheeler processes are fundamental interactions between charged particles/photons and intense electromagnetic fields.
- These processes are typically modeled using the external field approximation, assuming infinite field energy.
Purpose of the Study:
- To investigate the validity of the external field approximation in multiphoton processes.
- To quantify the energy depletion of intense laser pulses interacting with highly charged electron bunches.
Main Methods:
- Analysis of photon absorption scaling with external field amplitude.
- Estimation of laser pulse energy depletion under specific interaction conditions.
Main Results:
- The multiphoton nature implies significant photon absorption, scaling with the cube of the external field amplitude.
- Laser pulse energy depletion becomes significant when field amplitude a_{0} ~ 10^3 and electron bunch charge is ~10 nC.
Conclusions:
- The external field approximation breaks down for intense laser-electron bunch interactions due to substantial laser energy depletion.
- Accurate modeling of these processes requires considering the finite energy of the laser pulse.
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