Simultaneous estimation of plasma parameters from spectroscopic data of neutral helium using least square fitting of CR-model
محورهای موضوعی : Journal of Theoretical and Applied Physics
Jalaj Jain
1
(Universidad de Talca;Comisión Chilena de Energía Nuclear)
Ram Prakash
2
(Microwave Tubes Division, CSIR-Central Electronics and Engineering Research Institute)
Gheesa Lal Vyas
3
(Manipal University Jaipur)
Udit Narayan Pal
4
(Microwave Tubes Division, CSIR-Central Electronics and Engineering Research Institute)
Malay Bikas Chowdhuri
5
(Institute for Plasma Research)
Ranjana Manchanda
6
(Institute for Plasma Research)
Nilanjan Halder
7
(Manipal University Jaipur)
Yaduvendra Choyal
8
(School of Physics, Devi Ahilya Vishwavidyalaya)
کلید واژه: Penning discharge, Collisional, radiative model, Least square fitting, Opacity,
چکیده مقاله :
AbstractIn the present work an effort has been made to estimate the plasma parameters simultaneously like—electron density, electron temperature, ground state atom density, ground state ion density and metastable state density from the observed visible spectra of penning plasma discharge (PPD) source using least square fitting. The analysis is performed for the prominently observed neutral helium lines. The atomic data and analysis structure (ADAS) database is used to provide the required collisional-radiative (CR) photon emissivity coefficients (PECs) values under the optical thin plasma condition in the analysis. With this condition the estimated plasma temperature from the PPD is found rather high. It is seen that the inclusion of opacity in the observed spectral lines through PECs and addition of diffusion of neutrals and metastable state species in the CR-model code analysis improves the electron temperature estimation in the simultaneous measurement.
