# On certain aspects of the THERMOS toolkit for modeling experiments

## TL;DR

This paper reviews the THERMOS toolkit's capabilities in modeling plasma radiative properties, highlights recent upgrades for dense plasma effects, and demonstrates its application through experimental spectrum analysis.

## Contribution

It introduces recent enhancements to the THERMOS toolkit, including ionization potential lowering effects, and showcases its use in analyzing experimental plasma spectra.

## Key findings

- Successful modeling of chlorine spectra
- Effective analysis of silicon plasma transmission
- Validation against experimental data

## Abstract

The THERMOS toolkit has been developed to calculate radiative properties of plasmas. This article contains a brief survey of some of its key features used by calculation of opacities and emissivities and by analysis of specific experiments. The code has recently been upgraded to account for the effect of ionization potential lowering in dense plasmas. The functionality of the code is illustrated for several cases from the 10th NLTE Code Comparison Workshop, in particular, for the experimental spectra of chlorine [1] and for the measured transmission of a silicon plasma [2].