Assessment of density profile automatic evaluation from broadband reflectometry data

Autor:	J. M. Santos, P. Varela, S. Vergamota, V. Grossmann, M. E. Manso
Rok vydání:	2001
Předmět:	Electron density Nuclear magnetic resonance Materials science Density gradient ASDEX Upgrade Phase (waves) Continuous wave Plasma diagnostics Reflectometry Instrumentation Group delay and phase delay Computational physics
Zdroj:	Review of Scientific Instruments. 72:315-318
ISSN:	1089-7623 0034-6748
DOI:	10.1063/1.1323248
Popis:	Automatic evaluation of electron density profiles from frequency modulated continuous wave (FM–CW) broadband microwave reflectometry on ASDEX Upgrade has been achieved in all plasma regimes combining a high performance system and advanced analysis tools. The results presented demonstrate the capability of the system to resolve the abrupt gradient changes occurring in the edge region during the L–H transition and in the presence of edge localized modes (ELMs). The temporal evolution of the density gradient could be obtained extending from the ohmic and L phases to the ELMy H phase. A new data analysis method that uses sets of consecutive sweeps to extract the group delay is also presented and its use versus single sweep analysis is discussed. It is shown that local perturbations may appear and disappear during the sweep time reinforcing the need to obtain redundant data in very short time intervals and apply rejection/averaging techniques.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::06d83fdba23065e56742f0a8b6bdb00e https://doi.org/10.1063/1.1323248 Zobrazit plný text záznamu