Photons

Section author: Axel Huebl

Module author: Heiko Burau

Radiation reaction and (hard) photons: why and when are they needed. Models we implemented and verified:

Would be great to add your Diploma Thesis talk with pictures and comments here.

Please add notes and warnings on the models’ assumptions for an easy guiding on their usage :)

Note

Assumptions in Furry-picture and Volkov-States: classical em wave part and QED “pertubation”. EM fields on grid (Synchrotron) and density modulations (Bremsstrahlung) need to be locally constant compared to radiated coherence interval (“constant-crossed-field approximation”).

Attention

Bremsstrahlung: The individual electron direction and gamma emission are not correlated. (momentum is microscopically / per e- not conserved, only collectively.)

Attention

“Soft” photons from low energy electrons will get underestimated in intensity below a threshold of ... . Their energy is still always conserved until cutoff (defined in ...).

Note

An electron can only emit a photon with identical weighting. Otherwise, the statistical variation of their energy loss would be weighting dependent (note that the average energy loss is unaffected by that).

References

[Gonoskov]A. Gonoskov, S. Bastrakov, E. Efimenko, A. Ilderton, M. Marklund, I. Meyerov, A. Muraviev, A. Sergeev, I. Surmin, E. Wallin. Extended particle-in-cell schemes for physics in ultrastrong laser fields: Review and developments, Physical Review E 92, 023305 (2015), https://dx.doi.org/10.1103/PhysRevE.92.023305
[Furry]W. Furry. On bound states and scattering in positron theory, Physical Review 81, 115 (1951), https://doi.org/10.1103/PhysRev.81.115
[Burau2016]H. Burau. Entwicklung und Überprüfung eines Photonenmodells für die Abstrahlung durch hochenergetische Elektronen (German), Diploma Thesis at TU Dresden & Helmholtz-Zentrum Dresden - Rossendorf for the German Degree “Diplom-Physiker” (2016), https://doi.org/10.5281/zenodo.192116