Recent results from MAST Upgrade are presented, emphasising understanding the
capabilities of this new device and deepening understanding of key physics issues for the …

The mega amp spherical tokamak (MAST) was a low aspect ratio device (R/a= 0.85/0.65~
1.3) with similar poloidal cross-section to other medium-size tokamaks. The physics …

Fast ions in fusion plasmas often leave characteristic signatures in the neutron emission
from the plasma. In this paper, we show how neutron measurements can be used to study …

Spherical tokamaks are key to the successful design of operating scenarios of future fusion
reactors in the areas of divertor physics, neutral beam current drive and fast ion physics …

The sawtooth instability is known for inducing transport and loss of energetic particles (EPs),
and for generating seed magnetic islands that can trigger tearing modes. Both effects …

Energetic ions are found to be transported strongly from the core of MAST hybrid-like
plasmas during long-lived mode (LLM) magnetohydrodynamic activity. The resulting impact …

During the 2016 experimental campaign of NSTX-U (Menard et al 2012 Nucl. Fusion 52
083015), long L-mode and reproducible sawtoothing plasmas have been achieved that …

Experimental evidence is presented of a discrepancy between the predicted and measured
D–D fusion product rates on MAST. Both the neutron and proton production rates, measured …

A systematic investigation is carried out, studying the effect of the neutral beam injection
induced energetic particles (EPs) on the n= 1 (n is the toroidal mode number) internal kink …

The effects of sawtooth on fast ion transport have been studied in reproducible, 2 s long
sawtoothing L-mode discharges during the 2016 experimental campaign on National …