This monograph summarizes the results of an experimental investigation of the plasma
potential in toroidal magnetic fusion devices. It presents data obtained with the unique heavy …

Electric field Ε or electric potential φ plays a key role in the transport and turbulence of
toroidal plasmas. It is believed that mean radial E r suppresses the turbulence eddies via E× …

The effect of electron cyclotron heating (ECH) and electron cyclotron current drive (ECCD)
on energetic-particle (EP)-driven magnetohydrodynamic (MHD) modes is studied in the …

The heavy ion beam probe diagnostic is used in the TJ-II stellarator to study directly the
plasma electric potential with good spatial (up to 1 cm) and temporal (up to 2 μs) resolution …

Alfvén eigenmodes (AEs) were studied in low magnetic shear flexible heliac TJ-II (B 0= 0.95
T, R 0= 1.5 m, $\langle a\rangle $= 0.22 m) neutral beam injection (NBI) heated plasmas (P …

This paper is a summary of some of the major results from the Wendelstein 7-AS stellarator
(W7-AS). W7-AS [G. Grieger et al, Phys. Fluids B 4, 2081 (1992)] has demonstrated the …

We study the effect of low-order rational surfaces on electron heat transport in plasmas
confined in the TJ-II stellarator (Alejaldre et al 1990 Fusion Technol. 17 131) and heated by …

Plasma potential and turbulent particle flux Γ E× B in the plasma core were measured for the
first time during L–H/H–L transitions in the TJ-II heliac using a heavy ion beam probe. The L …

The influence of magnetic topology on the formation of electron internal transport barriers (e-
ITBs) has been studied experimentally in electron cyclotron heated plasmas in the stellarator …

This paper presents an overview of experimental results and progress made in investigating
the role of magnetic configuration on stability and transport in the TJ-II stellarator. Global …