Abstract
Electron temperature (Te) is one of the main plasma parameters, which is routinely measured during fusion experiments. The major systems for the Te determination used for tokamak and stellarator plasmas are Thomson scattering (TS) and Electron Cyclotron Emissions (ECE). Measurements of Te can be also performed by other diagnostics such as Pulse Height Analysis (PHA), which is mainly intended for impurity identification. Due to the fact that PHA system is able to provide an information about line-averaged electron temperature (<Te>), there is a need to specify experimental conditions under which 〈Te〉 determined from PHA spectra is comparable to the electron temperature from plasma centre (Te0). In this paper, the analysis related to the effect of electron temperature (Te) and density (ne) profiles on 〈Te〉 estimated from spectra collected by PHA diagnostic installed at Wendelstein 7-X (W7-X) is presented. The studies described in this work consists of simulation and experimental results, on the basis of which 〈Te〉 has been estimated for a wide range of experimental condition, that differ in combination of Te and ne profiles.
Published Version
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