Abstract
In 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.
Highlights
Penning plasma discharge (PPD) devices have been studied significantly during last few decades
The penning plasma discharge (PPD) device can generate spectral radiations in the visible and VUV region simultaneously and visible radiations analysis can help in VUV intensity calibration once the desired basic plasma parameters are obtained from the visible spectra
The gas pressure is controlled by the needle valve and discharge current is controlled with the control knob in the PPD source power supply
Summary
Penning plasma discharge (PPD) devices have been studied significantly during last few decades. This device was originally proposed by Penning as a low-pressure manometer (i.e., cold cathode or penning gauge) [1]. This has later been adopted to function as an ion source [2,3,4]. In the applications of light emitting sources it has recently been proposed that the PPD device can be used to calibrate a VUV spectrometerdetector system [10]. The PPD device can generate spectral radiations in the visible and VUV region simultaneously and visible radiations analysis can help in VUV intensity calibration once the desired basic plasma parameters are obtained from the visible spectra
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