opacplot2

Python package for manipulating Equation of State (EoS) and Opacity data.

Opacplot2 includes command-line tools to make EoS tables of various formats available to FLASH. opac-convert converts EoS/opacity tables like SESAME and Propaceos into a FLASH-readable IONMIX (.cn4) format. opac-error generates plots comparing the contents of two EoS tables for the same material. It is particularly useful for checking the consistency of conversions made with opac-convert.

Current Status

| EoS/Opacity Table | opac-convert | opac-error | |:-------|--------|--------|-----------| | IONMIX | N/A | ✔️ | | SESAME | ✔️ | ✔️ | | MULTI† | ✔️ | | | Propaceos* | ✔️ | ✔️ |

Additionally, QEOS-SESAME table support is in development.

*_{The Propaceos reader is only distributed with a Propaceos license.}

†_{Only opacity parsers are available for MULTI.}

Dependencies

opacplot2's dependencies include:

• numpy
• six
• tables
• matplotlib
• scipy
• periodictable
• hedp (https://github.com/luli/hedp)

They can be installed as follows:

pip install numpy six tables matplotlib scipy periodictable
pip install git+https://github.com/luli/hedp

For OS X users, it is advised to use Anaconda Python to install matplotlib in order to avoid framework errors:

conda install matplotlib

Installation

This module requires Python 2.7 or 3.5. The latest version can be installed with

pip install git+https://github.com/flash-center/opacplot2

If you have the Propaceos Python reader, in order to include it in the installation, you must install opacplot2 as follows:

git clone https://github.com/flash-center/opacplot2
cp /path/to/opg_propaceos.py opacplot2/opacplot2/
cd opacplot2
python setup.py install

Documentation & Wiki

Full documentation can be found here.

Example output from opac-convert may be found in the wiki.

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opac-convert

Command line tool for converting EoS Table formats into the IONMIX format that comes with opacplot2.

Supported input file formats:

• Propaceos (not distributed)
• SESAME (.ses)
• MULTI (.opp, .opr, .opz, .eps)

The only supported output format is IONMIX.

Usage

opac-convert [options] myfile.ext

opac-convert will attempt to read your file extension and convert it to IONMIX accordingly. If it is unable to read the extension, you can use the input flag to specify your filetype. Some files need additional information to write to IONMIX, such as atomic numbers. These you must specify with the command line options shown below.

Options

Option	Action
-i, --input	Specify the input filetype (propaceos, sesame, multi)
--Znum	Comma separated list of atomic numbers.
--Xfracs	Comma separated list of element fractions.
--outname	Specify the output filename.
--log	Comma separated list of logarithmic data.
--tabnum	SESAME table number (defaults to last).

Example

To specify the files atomic numbers, one may use --Znum with a comma separated list of integers. If more than one atomic number is given, one must also specify the element fractions with --Xfracs. For example, take a SESAME table for CH named myfile.ses:

opac-convert --Znum 1,6 --Xfracs .5,.5 myfile.ses

This will convert myfile.ses to an IONMIX file named myfile.cn4.

Logarithmic Data

If you would like to take the log of the data before you write it to the IONMIX file, use --log with a comma separated list of the data keys as shown below. Each key specified will be written to IONMIX after the base 10 logarithm has been applied.

Data	key
Ion number density	idens
Temperatures	temps
Average ionization	Zf_DT
Ion pressure	Pi_DT
Electron pressure	Pec_DT
Ion internal energy	Ui_DT
Electron internal energy	Uec_DT
Opacity bounds	groups
Rosseland mean opacity	opr_mg
absorption Planck mean opacity	opp_mg
emission Planck mean opacity	emp_mg

For example, in order to specify that the emission Planck Mean Opacity be written logarithmically:

opac-convert --log emp_mg my-file.ext

Troubleshooting

Invalid Literal for int()

The --log flag may be used to fix the following error:

ValueError: invalid literal for int() with base 10

This error arises when the exponent for the data is more than 2 digits long, which IONMIX does not support. What that usually means is that the data was originally stored logarithmically and must be written back to IONMIX as logarithmic data.

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opac-error

Command line tool for comparing two EoS table data. Unlike opac-convert, this tool will only compare equation of state data (not opacity). It is particularly useful in checking the consistency of opac-convert by comparing the original file with the converted IONMIX output.

Supported input file formats:

• Propaceos (not distributed, contact jtlaune at uchicago dot edu.)
• SESAME (.ses)
• IONMIX

The output will consist of an error report with maximum absolute % error RMS % error. All % errors are calculated with respect to the first file listed. The user may also opt to create % error plots for the EoS data stored in the file (ion/electron pressure and energy and average ionization). These consist of three plots with resolutions of 10%, 1%, and .01%.

Usage

opac-error [options] myfile_1.ext myfile_2.ext

Much like opac-convert, this tool will first attempt to read the extensions from your EoS tables in order to open them up. However, some file types require additional information, as in opac-convert, which can be specified in the [options]. The options have many of the same names as opac-convert but suffixed by _1 for file 1 or _2 for file 2.

Then, opac-error will create error reports for the following data:

• Average ionization
• Electron Ppessure
• Ion pressure
• Electron energy
• Ion energy

Included in the error report, we have

• Root mean squared % error
• Maximum absolute % error

If the --plot flag is called, opac-convert will also make error plots and save them as images to the current directory.

Options

Option	Action
--filetypes	Comma separated list of file types.
--mpi_#	Mass per ion (in grams) for IONMIX file 1 or 2.
--Znum_#	Comma separated list of atomic numbers for file 1 or 2.
--Xfrac_#	Comma separated list of number fractions for file 1 or 2.
--filters_#	dens_filter, temp_filter for file 1 or 2.
--tabnum_#	SESAME table number for file 1 or 2.
--plot	Create % error plots for data.
--writelog	Write log file with % errors for data.
--lin_grid	Plot using linear axes.

Example

See the wiki.

How It Works

First, opac-convert takes a conservative intersection of the two dens/temp grids from each file. Then it linearly interpolates the data from both files onto the intersection dens/temp grids. Using the interpolated data, it is able to create an error report.