Different techniques for investigation of plasma diffusion coefficient in IR-T1 Tokamak
| Autor: | M. Lafouti, Mahmood Ghoranneviss, Sakineh Meshkani |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Langmuir
Tokamak Materials science 010308 nuclear & particles physics Ambipolar diffusion Plasma diffusion Plasma 01 natural sciences 010305 fluids & plasmas law.invention symbols.namesake Physics::Plasma Physics law Electric field 0103 physical sciences symbols Langmuir probe Plasma diagnostics Atomic physics |
| Zdroj: | AIP Conference Proceedings. |
| ISSN: | 0094-243X |
| DOI: | 10.1063/1.4978816 |
| Popis: | Diffusion due to the run-away electrons in Tokamak can cause serious damages to the Tokamak walls. In this study, aiming for improving the plasma confinement, the diffusion coefficient was calculated in two different approaches using two different probes. In the first approach; Langmuir probe, was utilized to measure the poloidal electric field, radial flux and consequently the diffusion coefficient. On a more approach, the diffusion coefficient has been estimated by using the ball-pen probe and the Fourier-transform and the assumption of entirely diffusive plasma penetration inside the boron nitride shielding. In order to improve the plasma confinement, external biased voltages of ± 200 V were applied when the plasma experienced its stable phase. Comparing the results, a clear unity can be seen from both the Langmuir approach and the Ball-pen approach. As the results indicate, the diffusion coefficient in Langmuir approach decreased up to 40% when the positive biased voltage of 200 V was applied. However... |
| Databáze: | OpenAIRE |
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