Results 71 to 80 of about 1,608 (195)

RF heating and current drive on NSTX with high harmonic fast waves [PDF]

, 2003
NSTX is a small aspect ratio tokamak (R = 0.85 m, a = 0.65 m). The High Harmonic Fast Wave (HHFW) system is a 30 MHz, 12-element array capable of launching both symmetric and directional wave spectra for plasma heating and non-inductive current drive. It
Mau, T., Mueller, D., Swain, D., Bell, R., Menard, J., Rasmussen, D., Wilgen, J., Wilson, J., Carter, M., Bernabei, S., Peng, Y., Pinsker, R., Kaye, S., Darrow, D., Gates, D., Phillips, C., Brambilla, M., Maingi, R., Medley, S., LeBlanc, B., Synakowski, E., Batchelor, D., Bonoli, P., Bell, M., Sabbagh, S., Cardinali, A., Hosea, J., Frederickson, E., Paoletti, F., Rosenberg, A., Jaeger, E., Ono, M., Bitter, J., Ryan, P.   +33 more
core  

Observation of EHO in NSTX and Theoretical Study of its Active Control Using HHFW Antenna [PDF]

, 2013
Two important topics in the tokamak ELM control, using the non-axisymmetric (3D) magnetic perturbations, are studied in NSTX and combined envisioning ELM control in the future NSTX-U operation: Experimental observations of the edge harmonic oscillation ...
J.-K. Park, et. al.
core   +1 more source

Chosen Solutions to the Engineering Challenges of the National Spherical Torus Experiment (NSTX) Magnets [PDF]

, 1999
NSTX is one of the largest of a new class of magnetic plasma research devices known as spherical toroids (STs). The plasma in a ST is characterized by its almost spherical shape with a slender cylindrical region through its vertical axis. The so-called ''
Fan, H.M., Chrzanowski, J., Heitzenroeder, P., Neumeyer, C., Team, and the NSTX   +4 more
core   +1 more source

Kinetic neoclassical calculations of impurity radiation profiles

Nuclear Materials and Energy, 2017
Modifications of the drift-kinetic transport code XGC0 to include the transport, ionization, and recombination of individual charge states, as well as the associated radiation, are described.
D.P. Stotler, D.J. Battaglia, R. Hager, K. Kim, T. Koskela, G. Park, M.L. Reinke   +6 more
doaj   +1 more source

Real-time capable modeling of ICRF heating on NSTX and WEST via machine learning approaches

Nuclear Fusion
A real-time capable core Ion Cyclotron Range of Frequencies (ICRF) heating model on NSTX and WEST is developed. The model is based on two nonlinear regression algorithms, the random forest ensemble of decision trees and the multilayer perceptron neural ...
Á. Sánchez-Villar, Z. Bai, N. Bertelli, E.W. Bethel, J. Hillairet, T. Perciano, S. Shiraiwa, G.M. Wallace, J.C. Wright   +8 more
doaj   +1 more source

Stability and transport of gyrokinetic critical pedestals

Nuclear Fusion
A gyrokinetic threshold model for pedestal width–height scaling prediction is applied to multiple devices. A shaping and aspect ratio scan is performed on National Spherical Torus Experiment (NSTX) equilibria, finding $\Delta_{\mathrm{ped}} = 0.92 A^{1 ...
J.F. Parisi, A.O. Nelson, W. Guttenfelder, R. Gaur, J.W. Berkery, S.M. Kaye, K. Barada, C. Clauser, A. Diallo, D.R. Hatch, A. Kleiner, M. Lampert, T. Macwan, J.E. Menard   +13 more
doaj   +1 more source

Development of slow and fast wave coupling and heating from the C-Stellarator to NSTX

EPJ Web of Conferences, 2017
A historical perspective on key discoveries which contributed to understanding the properties of coupling both slow and fast waves and the effects on plasma heating and current drive will be presented.
Hosea Joel
doaj   +1 more source

Electron Bernstein Wave Research on NSTX and CDX-U [PDF]

, 2003
Studies of thermally emitted electron Bernstein waves (EBWs) on CDX-U and NSTX, via mode conversion (MC) to electromagnetic radiation, support the use of EBWs to measure the Te profile and provide local electron heating and current drive (CD) in ...
Efthimion, P. C., Taylor, G., Smirnov, A. P., Bigelow, T. S., Wilson, J. R., Jones, B., Rasmussen, D. A., Ram, A. K., Bers, A., Carter, M. D., Harvey, R. W., Bell, G. L., Wilgen, J. B., G. Taylor   +13 more
core   +1 more source

Students’ experience of cultural differences between mathematics and physics

Physical Review Physics Education Research
How students use mathematics in their physics classes has been studied extensively in the physics education literature. In addition to specific mathematical methods in specific physics contexts, possible effects of more general “cultural” differences ...
Jeffrey M. Rabin, Andrew Meyertholen, Brian Shotwell   +2 more
doaj   +1 more source

Self-consistent calculation of the effects of RF injection in the HHFW heating regimes on the evolution of fast ions in toroidal plasmas

EPJ Web of Conferences, 2017
A critical question for the use of ion cyclotron range of frequency (ICRF) heating in the ITER device and beyond is interaction of fast waves with energetic ion populations from neutral beam injection (NBI), fusion reactions, and minority ions ...
Bertelli Nicola, Gorelenkova Marina, Podesta Mario, Valeo Ernest, Green David, Fredrickson Eric   +5 more
doaj   +1 more source