A simple script to calculate basic parameters for relativistic laser plasma interactions.
When describing a laser, LPA people often define it by energy on target, or output power, with FWHM durations and beam size (can mean radius, waist, diameter etc). CheatSheet is a tiny library, which allows to define laser with different inputs and provides convertions between them. In the following example same laser is defined with the help of different parameters:
from LPICS.ics import CheatSheet as cs
lpi = cs(Energy=1.2, R_fwhm=16, tau_fwhm=27)
print(f"Power is {lpi.prm['Power']*1e-12:0.4g} TW" )
print(f"Duration field sqrt(2)*RMS is {lpi.prm['tau']:0.4g} fs" )
lpi = cs(Power=41.75e12, R_fwhm=16, tau=22.93)
print(f"\nField amplitude (normalized) is {lpi.prm['a0']:0.4g}" )
print(f"Beam waist is {lpi.prm['w0']:0.4g} um" )
lpi = cs(a0=2.595, w0=13.59, tau=22.93)
print(f"\nLaser energy is {lpi.prm['Energy']:0.4g} J")Power is 41.75 TW
Duration field sqrt(2)*RMS is 22.93 fs
Field amplitude (normalized) is 2.595
Beam waist is 13.59 um
Laser energy is 1.2 J
The lpi.prm dictionary containes the necessary conversions, and can be used directly, e.g. cs(Power=1e15, R_fwhm=50).prm['a0'], cs(lam0=0.8).prm['n_c']. Besides conversions, for a given laser there are useful methods to calculate some matching plasma densities:
lpi.match_density('WLu')lpi.match_density('longitudinal')lpi.match_density('critPower')
or to estimate the maximum ionization level produced by the laser:
lpi.element_Zmax(name=element_name, e.g. 'Ar')
You can use the script online via Binder
Can be installed by cloning the source
git clone https://github.com/hightower8083/LaserPlasmaICS.git
cd CheatSheet
pip install .or via PiPy
pip install git+https://github.com/hightower8083/LaserPlasmaICS.gitFeel free to propose your favorite formulas or fixes