Analysis of the temperature influence on Langmuir probe measurements on the basis of gyrofluid simulations
arXiv:1109.3600 · doi:10.1088/0741-3335/54/1/015012
Abstract
The influence of the temperature and its fluctuations on the ion saturation current and the floating potential, which are typical quantities measured by Langmuir probes in the turbulent edge region of fusion plasmas, is analysed by global nonlinear gyrofluid simulations for two exemplary parameter regimes. The numerical simulation facilitates a direct access to densities, temperatures and the plasma potential at different radial positions around the separatrix. This allows a comparison between raw data and the calculated ion saturation current and floating potential within the simulation. Calculations of the fluctuation-induced radial particle flux and its statistical properties reveal significant differences to the actual values at all radial positions of the simulation domain, if the floating potential and the temperature averaged density inferred from the ion saturation current is used.
Submitted to Plasma Physics and Controlled Fusion
References in corpus (1)
Cited by in corpus (3)
- Influence of temperature fluctuations on plasma turbulence investigations with Langmuir probes
- Experimental and numerical characterisation of the turbulence in the Scrape-Off Layer of MAST
- Intermittent electron density and temperature fluctuations and associated fluxes in the Alcator C-Mod scrape-off layer