Observation of Radially Inward Turbulent Particle Flux in ETG dominated Plasma of LVPD
| Autor: | R. Sugandhi, L. M. Awasthi, Pradeep Srivastava, P. K. Kaw, Prabhakar Srivastav, R. P. Singh, Rameswar Singh, A. K. Sanyasi |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Turbulence FOS: Physical sciences Flux Astrophysics::Cosmology and Extragalactic Astrophysics Electron Plasma Condensed Matter Physics 01 natural sciences Physics - Plasma Physics 010305 fluids & plasmas Ion Plasma Physics (physics.plasm-ph) Core (optical fiber) Physics::Plasma Physics 0103 physical sciences Physics::Space Physics Electron temperature Wave vector Atomic physics 010306 general physics |
| Popis: | Radially inward turbulent particle flux is observed in the core region of target plasma of Large Volume Plasma Device(LVPD). The region satisfy conditions for ETG turbulence, i.e. threshold condition, $ \eta_e = L_{n_e} / L_{T_e} > 2/3 $ , where density scale length, $ L_{n_e} \sim 300 cm $ and temerature scale length, $ L_{T_e} \sim 50cm $[S.K. Mattoo et al., Phys. Rev. Lett., 108, 255007(2012)\cite{Mattoo_PRL}]. The measured flux is dominantly electrostatic ($\Gamma_{es} \approx 10^{5} \Gamma_{em}$) although the nature of the measured turbulence is electromagnetic($\beta \approx 0.6 $). The turbulence has been established as a consequence of electron temperature gradient (ETG) driven modes. Experimental observations of phase angle between density ($ n_e $) and potential ($\phi $) fluctuations, $ \theta_{\tilde{n}_e, \tilde{\phi}} $ and electrostatic particle flux, $ \Gamma_{es} $ shows good agreement with the corresponding theoretical estimates for ETG turbulence. Comment: 11 pages, 18 figures |
| Databáze: | OpenAIRE |
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