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Edge transport and fuelling studies via gas puff modulation in ASDEX Upgrade L-mode plasmas
- Source :
- Nuclear Fusion
- Publication Year :
- 2022
-
Abstract
- Gas puff modulation experiments are performed at ASDEX Upgrade in L-mode plasmas. We model the discharge with the ASTRA transport code in order to determine transport coefficients outside of a normalized radius of ρ pol = 0.95. The experimental data is consistent with a range of particle diffusivities and pinch velocities of the order of D = (0.20 ± 0.13) m2 s−1 and v = (−1 ± 2) m s−1, respectively. The electron temperature response caused by the gas modulation permits to estimate also that heat diffusivity χ e increases almost linearly when collisionality rises due to fuelling. The fuelling particle flux is amplified by recycling, overcompensating losses.
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Nuclear Fusion
- Accession number :
- edsair.doi.dedup.....094cb4f077c30d87822e8cabe240fbd7