Results 91 to 100 of about 1,608 (195)

Modeling temperature profiles in the pedestal of NSTX with reduced models

Nuclear Fusion
This paper describes new modeling capabilities for predicting H-mode pedestal profiles in spherical tokamaks. Temperature profiles for NSTX discharges 132543 (narrow pedestal) and 132588 (wide pedestal, lithiated) are modeled by coupling the astra ...
P.-Y. Li, D.R. Hatch, L.A. Leppin, J. Schmidt, J.F. Parisi, M. Lampert, M. Kotschenreuther, S.M. Mahajan   +7 more
doaj   +1 more source

Hardwired Control Changes For NSTX DC Power Feeds

, 2013
The National Spherical Torus Experiment (NSTX) has been designed and installed in the existing facilities at Princeton Plasma Physics Laboratory (PPPL). Most of the hardware, plant facilities, auxiliary sub-systems, and power systems originally used for ...
Ramakrishnan, S.
core  

Plasma Response to the Application of 30 MHz RF Power in the NSTX Device [PDF]

, 2001
Radio-frequency power at 30 MHz has been applied in a variety of situations to National Spherical Torus Experiment (NSTX) plasmas. The response of the plasma is observed in order to study both the physics of High Harmonic Fast Wave (HHFW) heating and as ...
Mau, T. K., Bell, R. E., Menard, J., Ryan, P. M., Wilson, J. R., LeBlanc, B. P., Hosea, J. C., Sabbagh, S., Paoletti, F., Stutman, D., Rosenberg, A., Phillips, C. K., Ono, M., Swain, D. W., Wilgen, J. B., Takase, Y., Bernabei, S., Pinsker, R., J. R. Wilson   +18 more
core   +1 more source

Experimental scaling of compressional Alfvén eigenmode stability

Nuclear Fusion
Both co-propagating and counter-propagating compressional Alfvén eigenmodes (CAE) are relatively ubiquitous in NSTX plasmas with toroidal field strengths of ⩽4.65 kG, but are largely absent in the NSTX-U plasmas with toroidal fields of 5.7–5.9 kG.
E.D. Fredrickson
doaj   +1 more source

Filaments as the origin of HHFW losses in NSTX

AIP Conference Proceedings, 2023
Tierens, W., Bilato, R., Bertelli, N., Shiraiwa, S., Myra, J., Colas, L.   +5 more
openaire   +2 more sources

Global gyrokinetic simulations of kinetic ballooning mode in NSTX-U plasmas

Nuclear Fusion
Understanding the kinetic ballooning mode (KBM) is crucial for optimizing plasma performance in high- β spherical tokamaks. Global gyrokinetic simulations of KBMs in a projected NSTX-U shot are presented using realistic magnetic geometry and plasma ...
Tajinder Singh, Tariq Rafiq, Eugenio Schuster, Zhihong Lin, Animesh Kuley   +4 more
doaj   +1 more source

Observation of modes in the sub-cyclotronic range of frequencies in JET

Nuclear Fusion
The excitation of modes in the JET tokamak in the sub-cyclotronic range of frequencies (frequencies comprised between the Alfvén frequency and the cyclotron frequency) is for the first time reported.
F. Nabais, D. Borba, R. Coelho, J. Ferreira, A. Figueiredo, P. Rodrigues, S.E. Sharapov, JET Contributors   +7 more
doaj   +1 more source

Counter-propagating toroidal Alfvén eigenmodes in tokamaks

Nuclear Fusion
Mechanisms of destabilization of toroidal Alfvén eigenmodes (TAEs) in tokamaks are analyzed with the aim to reveal those leading to modes propagating in the direction opposite to plasma current, i.e. counter-propagating modes (ctr-TAE). Plasmas with fast-
Ya.I. Kolesnichenko, E.D. Fredrickson, V.V. Lutsenko, A.V. Tykhyy   +3 more
doaj   +1 more source

Prediction of electron density and pressure profile shapes on NSTX-U using neural networks

, 2021
A new model for prediction of electron density and pressure profile shapes on NSTX and NSTX-U has been developed using neural networks. The model has been trained and tested on measured profiles from experimental discharges during the first operational ...
Chadwick, Jason, Boyer, Mark
core  

Modeling of divertor heat flux limits and lithium vapor shielding in NSTX-U using UEDGE code

Nuclear Fusion
Managing extreme heat and particle fluxes to divertor targets remains a critical challenge for high-power spherical tokamaks such as NSTX-U. In this work, UEDGE simulations coupled self-consistently with a two-dimensional wall transport solver (Wall-Li ...
M.S. Islam, M.V. Umansky, V.A. Soukhanovskii   +2 more
doaj   +1 more source