Laser pulses
The OSIRIS code offers many possibilities for injecting EM radiation into the simulation. The main options available are:
- Initializing a laser pulse inside the simulation box
- Continuously injecting an EM wave from one of the simulation boundaries
Please check the zpulse
and antenna
sections of the reference guide for all the available options.
Gaussian beamPermalink
The simplest way to add a laser pulse to your simulation setup is to initialize it completely at the beginning of the simulation. This can be done by adding a zpulse
section at the end of the input file specifying the laser pulse spatial and temporal parameters. Please note that there is no limit on the number of laser pulses that can be added.
Initializing the complete laser pulse at oncePermalink
The following is an example of a laser pulse propagating along x in a 2D simulation. It uses a Gaussian profile with a normalized intensity of
zpulse {
a0 = 3.,
omega0 = 10.0,
propagation = "forward",
pol = 90,
per_type = "gaussian",
per_w0 = 2.82,
per_focus = 0.0,
lon_type = "sin2",
lon_rise = 2.82,
lon_fall = 2.82,
lon_flat = 0.0,
lon_start = 19.5,
}
Injecting from a wallPermalink
If instead, you want to gradually inject the laser pulse from a simulation wall you can use a zpulse_wall
section to accomplish this. The laser pulse parameters are the same as those defined in the previous section, except for the laser pulse duration parameters which are now set using the tenv_*
parameters. Also, when injecting from a wall, the user can select at which time the code will be starting to inject the laser pulse, which in this example will be at launch_time
parameter.)
zpulse_wall {
a0 = 3.,
omega0 = 10.0,
propagation = "forward",
pol = 90,
per_type = "gaussian",
per_w0 = 2.82,
per_focus = 0.0,
tenv_type = "sin2",
tenv_rise = 2.82,
tenv_fall = 2.82,
tenv_flat = 0.0,
launch_time = 0.0,
}
For more details please check the zpulse
sections of the reference guide.