We present novel experimental evidence of parametric decay instability of microwave
beams in the plasma edge of the Wendelstein 7-X stellarator. We propose that the instability …

We present a theoretical study of the ionization of nitrogen atom by a singly charged sodium
ion using the classical trajectory Monte Carlo method. Although we suffer from a lack of …

Abstract a versatile gas injection system and an absolute calibrated spectroscopic
observation system with more than 200 lines-of-sight have been installed in two divertor …

Plasma filaments have been measured with alkali beam emission spectroscopy in the
plasma edge, divertor island, and scrape-off layer of Wendelstein 7-X. Due to the high …

The formation of the radial electric field, Er in the scrape-off layer (SOL) has been
experimentally studied for attached divertor conditions in stellarator W7-X. The main …

Abstract Recently the Lithium-Beam Emission Spectroscopy (Li-BES) system on COMPASS
has reached its full diagnostic power in terms of routine automatic operation in any kind of …

An H-mode plasma state free of edge-localized mode (ELM), close to the LH transition with
clear density and temperature pedestal has been observed both at the Joint European Torus …

During the island divertor operation of W7-X, especially in standard magnetic configuration
(with 5/5 island chain in the scrape-off-layer (SOL)), quasi-periodic electromagnetic …

Energy generation through nuclear fusion is emission-free, base load capable and requires
a relatively low amount of resources due to the high energy density of the fusion fuel, so that …

An imaging heavy ion beam probe (i-HIBP) diagnostic, for the simultaneous measurement of
plasma density, magnetic field and electrostatic potential in the plasma edge, has been …