B.P. LeBlanc
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View article: Development of a data-driven neural network model for electron thermal transport in NSTX
Development of a data-driven neural network model for electron thermal transport in NSTX Open
A data-driven electron thermal transport neural network (ETT-NN) model, trained on TRANSP interpretative analysis results of National Spherical Torus Experiment (NSTX), was developed to enable faster and more accurate ETT computation for s…
View article: Reversed magnetic shear scenario development in NSTX-U using TRANSP
Reversed magnetic shear scenario development in NSTX-U using TRANSP Open
Understanding and control of electron thermal transport is a critical point of research in magnetic fusion experiments. Previous experiments have shown that operation with reversed magnetic shear (RMS) can suppress electron thermal transpo…
View article: Design of a Thomson scattering diagnostic for the SMall Aspect Ratio Tokamak (SMART)
Design of a Thomson scattering diagnostic for the SMall Aspect Ratio Tokamak (SMART) Open
We describe the design of a Thomson scattering (TS) diagnostic to be used on the SMall Aspect Ratio Tokamak (SMART). SMART is a spherical tokamak being commissioned in Spain that aims to explore positive triangularity and negative triangul…
View article: Robotized phased-array inspection of sandwich-structured aircraft components
Robotized phased-array inspection of sandwich-structured aircraft components Open
be challenging. The manual inspection techniques usually used in this context are time-consuming and can lead to inconsistent results. L3Harris and the Centre Technologique en Aérospatiale (CTA) have developed a novel robotized solution to…
View article: Design of a Thomson scattering diagnostic for the SMART tokamak
Design of a Thomson scattering diagnostic for the SMART tokamak Open
We describe the design of a Thomson scattering (TS) diagnostic to be used on the SMall Aspect Ratio Tokamak (SMART). SMART is a spherical tokamak being commissioned in Spain that aims to explore positive triangularity (PT) and negative tri…
View article: Real-Time Ethernet Interface for NSTX-U’s Thomson Scattering Diagnostic (2023)
Real-Time Ethernet Interface for NSTX-U’s Thomson Scattering Diagnostic (2023) Open
Here, the multipoint Thomson scattering (MPTS) diagnostic system at the National Spherical Torus Experiment Upgrade (NSTX-U) facility is undergoing an upgrade to operate in real-time and interface with the plasma control system (PCS) for N…
View article: Estimates of global recycling coefficients for LTX-<i>β</i> discharges
Estimates of global recycling coefficients for LTX-<i>β</i> discharges Open
We report the first observation of global recycling coefficient R near 0.5 in the Lithium Tokamak eXperiment-β (LTX-β), significantly below the minimum R previously reported in other devices. In a series of experiments with varied Li wall …
View article: Polymer expert – A software tool for de novo polymer design
Polymer expert – A software tool for de novo polymer design Open
A versatile and user-friendly "expert system" for de novo polymer design, named Polymer Expert, has been developed and implemented. Polymer Expert can be used to rapidly generate novel candidate polymer repeat units to meet desired perform…
View article: Anthropomorphic Design and Self-Reported Behavioral Trust: The Case of a Virtual Assistant in a Highly Automated Car
Anthropomorphic Design and Self-Reported Behavioral Trust: The Case of a Virtual Assistant in a Highly Automated Car Open
The latest advances in car automation present new challenges in vehicle–driver interactions. Indeed, acceptance and adoption of high levels of automation (when full control of the driving task is given to the automated system) are conditio…
View article: Extending the low-recycling, flat temperature profile regime in the lithium tokamak experiment-β (LTX-β) with ohmic and neutral beam heating
Extending the low-recycling, flat temperature profile regime in the lithium tokamak experiment-β (LTX-β) with ohmic and neutral beam heating Open
Recent experiments in the lithium tokamak experiment- β (LTX- β ) have extended the duration, performance, operating conditions, and diagnosis of the flat-temperature profile, low-recycling regime first observed in LTX. As expected, Li ret…
View article: Disruption event characterization and forecasting in tokamaks
Disruption event characterization and forecasting in tokamaks Open
Disruption prediction and avoidance is a critical need for next-step tokamaks, such as ITER. Disruption Event Characterization and Forecasting (DECAF) research fully automates analysis of tokamak data to determine chains of events that lea…
View article: NSTX-U theory, modeling and analysis results
NSTX-U theory, modeling and analysis results Open
The mission of the low aspect ratio spherical tokamak NSTX-U is to advance the physics basis and technical solutions required for optimizing the configuration of next-step steady-state tokamak fusion devices. NSTX-U will ultimately operate…
View article: Erratum: “Correlation between the relative blob fraction and plasma parameters in NSTX” [Phys. Plasmas <b>29</b>, 012505 (2022)]
Erratum: “Correlation between the relative blob fraction and plasma parameters in NSTX” [Phys. Plasmas <b>29</b>, 012505 (2022)] Open
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View article: Correlation between the relative blob fraction and plasma parameters in NSTX
Correlation between the relative blob fraction and plasma parameters in NSTX Open
This paper presents a simple analysis of the fraction of blobs observed in the scrape-off layer of NSTX and calculates the correlation between this blob fraction and various plasma parameters. The measurements were made using the gas puff …
View article: Chirping ion cyclotron emission (ICE) on NSTX-U
Chirping ion cyclotron emission (ICE) on NSTX-U Open
In this work, we report on the discovery on NSTX-U of a qualitatively new type of non-thermal emission from plasmas in the ion-cyclotron frequency range (ICE). This new type of ICE is weakly damped, γdamp/ωICE ≈ 0.14%, low order eigenmodes…
View article: Divertor Heat Flux Mitigation in the National Spherical Torus Experiment
Divertor Heat Flux Mitigation in the National Spherical Torus Experiment Open
Steady-state handling of divertor heat flux is a critical issue for both ITER and spherical torus-based devices with compact high power density divertors. Significant reduction of heat flux to the divertor plate has been achieved simultane…
View article: Analyses of Divertor Regimes in NSTX
Analyses of Divertor Regimes in NSTX Open
Identification of divertor operating regimes is of particular importance for heat and particle control optimization in high performance plasmas of a spherical torus, because of the magnetic geometry effects and compactness of the divertor …
View article: Results from the CDX-U Lithium Wall and NSTX Lithium Pallet Injection and Evaporation Experiments
Results from the CDX-U Lithium Wall and NSTX Lithium Pallet Injection and Evaporation Experiments Open
CDX-U has been operated with the vacuum vessel wall and limiter surfaces nearly completely coated with lithium, producing dramatic improvements to plasma performance. Discharges achieved global energy confinement times up to 6 ms, exceedin…
View article: Recent Physics Results from NSTX
Recent Physics Results from NSTX Open
The National Spherical Torus Experiment (NSTX) has made considerable progress in advancing the scientific understanding of high performance long-pulse plasmas needed for ITER and future low-aspect-ratio Spherical Torus (ST) devices. Plasma…
View article: Outer midplane neutral density measurements and H-mode fueling studies in NSTX-U
Outer midplane neutral density measurements and H-mode fueling studies in NSTX-U Open
Neutral density profiles are measured on the outboard midplane of the National Spherical Torus Experiment Upgrade (NSTX-U) using a two dimensional camera (ENDD, edge neutral density diagnostic) filtered for deuterium Balmer α (D α ) emissi…
View article: Exploring the regime of validity of global gyrokinetic simulations with spherical tokamak plasmas
Exploring the regime of validity of global gyrokinetic simulations with spherical tokamak plasmas Open
We report that plasma turbulence is considered one of the main mechanisms for driving anomalous thermal transport in magnetic confinement fusion devices. Based on first-principle model, gradient-driven gyrokinetic simulations have often be…
View article: Experimental observation of electron-scale turbulence evolution across the L–H transition in the National Spherical Torus Experiment
Experimental observation of electron-scale turbulence evolution across the L–H transition in the National Spherical Torus Experiment Open
Electron-scale turbulence (for $3$ $\\lesssim$ $k⟂ρ_s$ $\\lesssim$ $12$) ) was measured during the L–H transition in the National Spherical Torus Experiment (NSTX) (Ono et al 2000 Nucl. Fusion 40 557) using a coherent microwave scattering …
View article: A scalable real-time framework for Thomson scattering analysis: Application to NSTX-U
A scalable real-time framework for Thomson scattering analysis: Application to NSTX-U Open
A detailed description of a prototype setup for real-time (RT) Thomson scattering (TS) analysis is presented and implemented in the multi-point Thomson scattering (MPTS) diagnostic system at the National Spherical Torus Experiment Upgrade …
View article: Emission in the ion cyclotron range of frequencies (ICE) on NSTX and NSTX-U
Emission in the ion cyclotron range of frequencies (ICE) on NSTX and NSTX-U Open
We report here on observations of magnetic fluctuations in the ion-cyclotron frequency range on NSTX and NSTX-U. In many respects, the fluctuations appear similar to the ion cyclotron emission (ICE) seen in conventional tokamaks. However, …
View article: Initial transport and turbulence analysis and gyrokinetic simulation validation in NSTX-U L-mode plasmas
Initial transport and turbulence analysis and gyrokinetic simulation validation in NSTX-U L-mode plasmas Open
Transport analysis, ion-scale turbulence measurements, and initial linear and nonlinear gyrokinetic simulations are reported for a transport validation study based on low aspect ratio NSTX-U L-mode discharges. The relatively long, stationa…
View article: Global Alfvén eigenmode scaling and suppression: experiment and theory
Global Alfvén eigenmode scaling and suppression: experiment and theory Open
The spherical tokamak NSTX has been upgraded to include a second neutral beam line, with three independent beam sources, and to be capable of higher toroidal fields and longer duration plasmas [Ono, et al., Nucl. Fusion 55 (2015) 073007]. …
View article: Scenario development during commissioning operations on the National Spherical Torus Experiment Upgrade
Scenario development during commissioning operations on the National Spherical Torus Experiment Upgrade Open
The National Spherical Torus Experiment Upgrade (NSTX-U) will advance the physics basis required for achieving steady-state, high-beta, and high-confinement conditions in a tokamak by accessing high toroidal fields (1 T) and plasma current…