The simulated radiation emission spectra were then compared with the measured spectra of a laboratory helicon plasma source for the prediction of the plasma parameters such as electron temperature and electron density. The model considers the emissions of 146 Ar-I lines (in 86.68–2397.3 nm range) and 303 Ar-II lines (in 71.8–6985.3 nm range), and gives the simulated spectra over the optical and near-optical region. With the gathered data of collisional and radiative rate coefficients from LANL (Los Alamos National Laboratory) and NIST (National Institute of Standards and Technology), this model calculates the time-varying population densities of 101 atomic and 222 ionic energy levels. ICRH: ion cyclotron resonance heating, is the mechanism by whichRF waves further heat the plasma in the VASIMR 2nd. Helicon: 1st stage of VASIMR, is a high density plasma source, working with RF power to breakdown the propellant gas and produce the pl asma. In the developed model, rather than grouping the energy levels into lumped sets, all the energy levels up to a maximum level were modeled for both the argon neutrals and the argon single ions. RF: radio frequency power used to create and heat the plasma in the VASIMR. A new Collisional Radiative (CR) model is developed for argon plasma at low temperature and low pressure. Plasma spectroscopy may be merged with plasma modelling and simulation to perform numerical diagnostics. Plasma spectroscopy is a common method for diagnosing the radiative behaviour and predicting the key properties of a plasma.
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