@article{oai:repo.qst.go.jp:00076598,
 author = {Bierwage, Andreas and Timur, Esirkepov and Kevin Koga, James and Pirozhkov, Alexander and Bierwage, Andreas and Timur, Esirkepov and Kevin Koga, James and Pirozhkov, Alexander},
 journal = {Computer Physics Communications},
 month = {Jul},
 note = {Using particle-in-cell simulations of relativistic laser plasma wakes in the presence of an external magnetic field, we demonstrate that there exists a parameter window where the dynamics of the magnetized wake channel are largely independent of the laser wavelength. One condition for this manifestation  of “limited similarity” is that the electron density is highly subcritical, so that the plasma does not affect the laser. The freedom to choose a convenient laser wavelength can be useful in experiments and simulations. In simulations, an up-scaled wavelength (and, thus, a coarser mesh and larger time steps) reduces the computational effort, while limited similarity ensures that the overall structure and evolutionary phases of the wake channel are preserved. In our demonstrative example, we begin with a terrawatt-picosecond pulse from a CO2 laser with 10 micron wavelength, whose field reaches a relativistic amplitude at the center of a sub-millimeter-sized focal spot. The laser is shot into a sparse deuterium gas in the presence of a tesla-scale magnetic field. Limited similarity is demonstrated in 2D for 4-40 microns lasers and is expected to extend to shorter wavelengths. Assuming that this limited similarity also holds in 3D, increasing the wavelength to 40 microns enables us to simulate the after-glow dynamics of the wake channel all the way into the nanosecond regime.},
 pages = {49--68},
 title = {Similarity of magnetized plasma wake channels behind relativistic laser pulses with different wavelengths},
 volume = {244},
 year = {2019}
}