M.J. Lanctot
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View article: Progress in disruption prevention for ITER
Progress in disruption prevention for ITER Open
Key plasma physics and real-time control elements needed for robustly stable operation of high fusion power discharges in ITER have been shown in recent research worldwide. Recent analysis has identified the current density profile as the …
Conceptual design of extended magnetic probe set to improve 3D field detection in NSTX-U Open
Adding toroidal arrays of magnetic probes at the top and bottom of NSTX-U would improve both the detection of the multimodal plasma response to applied magnetic perturbations and the identification of the poloidal structure of unstable pla…
View article: Development of high poloidal beta, steady-state scenario with ITER-like tungsten divertor on EAST
Development of high poloidal beta, steady-state scenario with ITER-like tungsten divertor on EAST Open
Recent experiments on EAST have achieved the first long pulse H-mode (61 s) with zero loop voltage and an ITER-like tungsten divertor, and have demonstrated access to broad plasma current profiles by increasing the density in fully-nonindu…
Impact of toroidal and poloidal mode spectra on the control of non-axisymmetric fields in tokamaks Open
In several tokamaks, non-axisymmetric magnetic field studies show that applied magnetic fields with a toroidal harmonic n = 2 can lead to disruptive n = 1 locked modes. In Ohmic plasmas, n = 2 magnetic reconnection thresholds in otherwise …
View article: Stability of DIII-D high-performance, negative central shear discharges
Stability of DIII-D high-performance, negative central shear discharges Open
Tokamak plasma experiments on the DIII-D device demonstrate high-performance, negative central shear (NCS) equilibria with enhanced stability when the minimum safety factor qmin exceeds 2, qualitatively confirming theoretical predictions o…
View article: A path to stable low-torque plasma operation in ITER with test blanket modules
A path to stable low-torque plasma operation in ITER with test blanket modules Open
New experiments in the low-torque ITER Q = 10 scenario on DIII-D demonstrate that n = 1 magnetic fields from a single row of ex-vessel control coils enable operation at ITER performance metrics in the presence of applied non-axisymmetric m…
View article: Interaction of external n = 1 magnetic fields with the sawtooth instability in low-q RFX-mod and DIII-D tokamaks
Interaction of external n = 1 magnetic fields with the sawtooth instability in low-q RFX-mod and DIII-D tokamaks Open
External n = 1 magnetic fields are applied in RFX-mod and DIII-D low safety factor Tokamak plasmas to investigate their interaction with the internal MHD dynamics and in particular with the sawtooth instability. In these experiments the ap…
Error field optimization in DIII-D using extremum seeking control Open
DIII-D experiments have demonstrated a new real-time approach to tokamak error field control based on maximizing the toroidal angular momentum. This approach uses extremum seeking control theory to optimize the error field in real time wit…
View article: The external kink mode in diverted tokamaks
The external kink mode in diverted tokamaks Open
An explanation is provided for the disruptive instability in diverted tokamaks when the safety factor $q$ at the 95 % poloidal flux surface, $q_{95}$ , is driven below 2.0. The instability is a resistive kink counterpart to the current-dri…
Suppression of type-I ELMs with reduced RMP coil set on DIII-D Open
Recent experiments on DIII-D have demonstrated that having a toroidally-monochromatic spectral content of edge-resonant magnetic perturbations (RMPs) is not a necessary condition for suppression of edge localized modes (ELMs). Robust ELM s…
Dependence of neoclassical toroidal viscosity on the poloidal spectrum of applied nonaxisymmetric fields Open
This paper presents a single mode model that accurately predicts the coupling of applied nonaxisymmetric fields to the plasma response that induces neoclassical toroidal viscosity (NTV) torque in DIII-D H-mode plasmas. The torque is measur…