ZhanjunLiuICF / ICF_CBET

Inertial Confinement Fusion Cross Beam Energy Tranfer Simulation (ICF_CBET)

ICF_CBET is a simulation primarily written in C++ with a Python plotting post-processor. The simulation models the phenomenon of "cross beam energy transfer" (CBET) and is based upon the work of Russ Follett (DOI: 10.1103/PhysRevE.98.043202), and the more basic algorithm used here is derived from a previous simulation written in Yorick by Professor Adam Sefkow (University of Rochester). CBET occurs as a consequence of the ion-acoustic waves created by the beat frequency of overlapping laser beams. These waves mediate an energy transfer between the waves, which has significant consequences for research into inertial confinement fusion, as uniform energy deposition across the target is essential. This simulation is an in-production attempt to model this phenomenon in its simplest case, a two beam crossing modeled in two dimensions. Note that this was developed in a Linux environment, and therefore the library dependencies are configured for a standard Linux file organization.

Configuration and Use

The following packages are required to run the simulation and use the post-processor:

• C++11 along with g++
• Python 3 (along with the following packages)
  • Tkinter
  • Matplotlib
  • Numpy
• HDF5
  • h5c++ (found in the hdf5-helpers package)
• OpenMP\n To install these dependencies automatically (on an Ubuntu based distribution), run:

sudo make install

Alternatively, these packages can be installed separately on any other Linux based distribution.

Usage

To build the simulation, run make in the top directory. The object files and dependency files are stored in the Bin folder at compile time. Run the simulation with ./implSim. The results of the simulation is stored in output/implSim.hdf in the HDF5 format. The file I/O is handled by lib/h5/hdf5writer.cpp. All other source files are found in the src directory, with headers in the include directory. Various settings for the simulation execution can be found labeled in include/simConst.hpp. These allow to configure for print output, set a maximum number of iterations for the CBET calculation, set the number of threads for OMP vectorization, and determine if the python plotting script should be automatically run upon completion. If the Python script is used, the primary output plots will be shown upon simulation completion. After that window is closed, a separate window will appear that will allow for plotting specific quantities saved in HDF5. If any of the header files are changed, the command make reset is necessary to recompile the dependency files. This will delete all .o and .d files in the Bin directory and rerun make. To delete all .o and .d files without the recompilation, run make clean.

Limitations

Note that this software is incomplete, and thus should not be used for any results-dependent work. The field amplitudes at intensities > 1e16 W/cm² in the pump beam are far larger than reasonable. Similarly, when the beam radius <= 2e-5 cm, the ray tracer contained in the files src/RayLaunch.cpp and src/Launch_Ray_XZ.cpp does not properly record all ray intersections, leaving large portions of beams unchanged even at high intensities.