Wendelstein 7-AS was the first modular stellarator device to test some basic elements of
stellarator optimization: a reduced Shafranov shift and improved stability properties resulted …

Superthermal energetic particles (EP) often drive shear Alfvén waves unstable in
magnetically confined plasmas. These instabilities constitute a fascinating nonlinear system …

The development of reduced models provide efficient methods that can be used to perform
short term experimental data analysis or narrow down the parametric range of more …

Clump and hole creations are observed with TAE bursts in energetic neutral spectra at low-
magnetic field configurations of the LHD. Energy slowing down of the clump and the hole …

The mission of HL-2A is to explore the key physical topics relevant to ITER and to the
advanced tokamak operation (eg the operation of future HL-2M), such as the access of H …

Comprehensive understanding of energetic-ion-driven global instabilities such as Alfvén
eigenmodes (AEs) and their impact on energetic ions and bulk plasma is crucially important …

Typical ELMy H-mode discharges have been achieved on the HL-2A tokamak with
combined auxiliary heating of NBI and ECRH. The minimum power required is about 1.1 …

Experiments in the DIII-D tokamak show that many overlapping small-amplitude Alfvén
eigenmodes (AEs) cause fast-ion transport to sharply increase above a critical threshold in …

A new bursting m= 1/n= 1 instability (m, n: poloidal and toroidal mode numbers) with rapid
frequency chirping down has been observed for the first time in a helical plasma with intense …

Energetic particle populations in nuclear fusion experiments can destabilize the Alfvén
Eigenmodes through inverse Landau damping and couplings with gap modes in the shear …