Optical Emission and Langmuir Probe Diagnostic Measurements in DC Electrode Pulse Discharge in Nitrogen
- Авторлар: Qayyum A.1, Deeba F.1, Ahmad S.1, Ahmad Z.1, Naseer M.1, Shah S.1, Hussain S.1, Zakaullah M.2
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Мекемелер:
- National Tokamak Fusion Program
- Rafi M. Chaudhri Chair, Center for Advanced Studies in Physics, GC University
- Шығарылым: Том 57, № 6 (2019)
- Беттер: 821-831
- Бөлім: Plasma Investigations
- URL: https://journals.rcsi.science/0018-151X/article/view/158113
- DOI: https://doi.org/10.1134/S0018151X19070022
- ID: 158113
Дәйексөз келтіру
Аннотация
Optical emission of selected nitrogen bands is analyzed for different nitrogen fill pressure and input electrical power to find the changes in spectral intensities with changing discharge conditions. The electron temperature Te is inferred from the intensity ratio \(\left( {{{I_{{BX}}^{ + }} \mathord{\left/ {\vphantom {{I_{{BX}}^{ + }} {{{I}_{{CB}}}}}} \right. \kern-0em} {{{I}_{{CB}}}}}} \right)\) of (0–0, 391.44 nm) and (0–2, 380.49 nm) band heads whereas electron number density ne from the intensity ratio and the corresponding rate coefficient X (cm3 s–1) for the given temperatures. Both band heads belonging to the first negative system and second positive system of nitrogen have a different threshold of excitation energies, and therefore the corresponding emission intensities provide a direct correlation between the group of electrons involved in optical emission (a part of electron energy distribution function above the excitation and ionization thresholds) and electron temperature. Measured intensity ratio \(\left( {{{I_{{BX}}^{ + }} \mathord{\left/ {\vphantom {{I_{{BX}}^{ + }} {{{I}_{{CB}}}}}} \right. \kern-0em} {{{I}_{{CB}}}}}} \right)\) and resulting Te both increase with input power and decrease with gas fill pressure following almost the same trend. Besides, time-averaged triple probe measurements have been performed to determine Teff and ne under the same discharge conditions for the sake of comparison. The spectroscopic method provides the variation of Te and ne at various discharge power and gas pressure in comparison with probe measurements. This study will help to optimize the discharge conditions in terms of active species concentration, electron temperature and electron number density for technological applications.
Авторлар туралы
A. Qayyum
National Tokamak Fusion Program
Хат алмасуға жауапты Автор.
Email: abdul.qaui@gmail.com
Пәкістан, Islamabad, 3329
F. Deeba
National Tokamak Fusion Program
Email: abdul.qaui@gmail.com
Пәкістан, Islamabad, 3329
S. Ahmad
National Tokamak Fusion Program
Email: abdul.qaui@gmail.com
Пәкістан, Islamabad, 3329
Z. Ahmad
National Tokamak Fusion Program
Email: abdul.qaui@gmail.com
Пәкістан, Islamabad, 3329
M. Naseer
National Tokamak Fusion Program
Email: abdul.qaui@gmail.com
Пәкістан, Islamabad, 3329
S. Shah
National Tokamak Fusion Program
Email: abdul.qaui@gmail.com
Пәкістан, Islamabad, 3329
S. Hussain
National Tokamak Fusion Program
Email: abdul.qaui@gmail.com
Пәкістан, Islamabad, 3329
M. Zakaullah
Rafi M. Chaudhri Chair, Center for Advanced Studies in Physics, GC University
Email: abdul.qaui@gmail.com
Пәкістан, Lahore, 54000