pica

Polarized ICS Calculator

Monte Carlo code for the simulation of Inverse Compton Scattering gamma-ray spectra including the photon polarization. The primary usage is for the LUXE experiment https://arxiv.org/abs/2102.02032.

Source

https://github.com/hixps/pica

Dependencies

• python >= 3.10
• numpy >= 2.0
• scipy
• h5py
• pyyaml
• dacite

Installation

pip install <path to pica source>

or

pip install git+https://github.com/hixps/pica.git

Useage

import pica

SIM = pica.ICSSimulation( input_filename='input_file' )
SIM.run()

Input

Input files for configuring the simulation in the yaml format.

Output

Simulation output files are hdf5 in PTARMIGAN-compatible format: https://github.com/tgblackburn/ptarmigan

Changelog

• v1.2.9
  • fixed the setup
• v1.2.8
  • self.number_electrons
  • cross section normalization benchmarked against PTARMIGAN
• v1.2.5
  • Stokes parameters in the x-z plane are now standard
  • Implemented methods to calculate Stokes parameters in scattering plane
• v1.2.4
  • switched Stokes parameter definition to S3=circular
  • Stokes parameter S0=1 for consistency with PTARMIGAN
  • rename 'Stokes' group in hdf5 output to 'polarization'
  • switched to 'pulse_rescale_bias' instead of 'sigma_rescaling' parameter
  • record units of output, unit section in input file
    • config/unit/position = ('micron')
    • config/unit/momentum = ('eV','keV','MeV','GeV')
  • pulse length parameter renamed to TFWHM
  • cleanup of old cross sections, only Cross_Section_Full useable