Results 31 to 40 of about 4,697,162 (157)

Preliminary design of a tangentially viewing imaging bolometer for NSTX-U [PDF]

Review of Scientific Instruments, 2016
The infrared imaging video bolometer (IRVB) measures plasma radiated power images using a thin metal foil. Two different designs with a tangential view of NSTX-U are made assuming a 640 × 480 (1280 × 1024) pixel, 30 (105) fps, 50 (20) mK, IR camera imaging the 9 cm × 9 cm × 2 μm Pt foil. The foil is divided into 40 × 40 (64 × 64) IRVB channels.
B. J. Peterson, R. Sano, M. L. Reinke, J. M. Canik, L. F. Delgado-Aparicio, J. D. Lore, K. Mukai, T. K. Gray, G. G. van Eden, M. A. Jaworski   +9 more
openaire   +2 more sources

Initial studies of plasma facing component surface conditioning in the national spherical tokamak experiment upgrade with the materials analysis particle probe

Nuclear Materials and Energy, 2017
An innovative PFC diagnostic, the Materials Analysis Particle Probe (MAPP) was used to study the chemistry of Plasma Facing Components (PFCs) in the National Spherical Tokamak Experiment Upgrade (NSTX-U). NSTX-U used boronization as conditioning strategy
F. Bedoya, J.P. Allain, R. Kaita, C.H. Skinner, B.E. Koel, F. Scotti   +5 more
doaj   +1 more source

Diagnostic Development for ST Plasmas on NSTX [PDF]

, 2003
Spherical tokamaks (STs) have much lower aspect ratio (a/R) and lower toroidal magnetic field, relative to tokamaks and stellarators. This paper will highlight some of the challenges and opportunities these features pose in the diagnosis of ST plasmas on
Team, NSTX, Johnson, D.
core   +1 more source

Overview of NSTX Upgrade initial results and modelling highlights [PDF]

, 2017
The National Spherical Torus Experiment (NSTX) has undergone a major upgrade, and the NSTX Upgrade (NSTX-U) Project was completed in the summer of 2015. NSTX-U first plasma was subsequently achieved, diagnostic and control systems have been commissioned,
Domier, C., Taylor, G, Soukhanovskii, V., Goumiri, I., G. Canal, Gray, T, M. Finkenthal, Kaita, R, Stutman, D, Reinke, M., M. Reinke, LaHaye, R.J., Ono, M, A. Diallo, Wang, Z., Schuster, E., W. Heidbrink, Soukhanovskii, V, Berkery, J.W., Perkins, R., Schmitz, O., Podesta, M, Heidbrink, W, R. Kaita, M. Podesta, Stutman, D., Raman, R, D. Brennan, Wirth, B., Zweben, SJ, J. Canik, Fredrickson, E., Myers, CE, Battaglia, D.J., Frerichs, H., M.A. Jaworski, Rhodes, T., B. Wirth, Sechrest, Y., E. Fredrickson, Jarboe, T, Mckee, G, Bedoya, F., Allain, JP, V. Soukhanovskii, Finkenthal, M., Evans, T, L. Delgado-Aparicio, D. Gates, Evans, T., Kriete, DM, Myra, J, Tritz, K, Raman, R., Smith, DR, Ren, Y., Wang, W, Wang, Z, Delgado-Aparicio, L, Battaglia, DJ, Maingi, R., Capece, A, Menard, J.E., R.E. Bell, Diallo, A, Ebrahimi, F., Berkery, JW, Hosea, J., Liu, D, A. Capece, Bedoya, F, F. Bedoya, Kaye, SM, N. Ferraro, J. Myra, Park, J-K, Poli, F, N. Luhmann, Gerhardt, S., Gan, K, Russell, D, T. Rhodes, Myra, J., C. Domier, D. Humphreys, Kubota, S., Sechrest, Y, Jaworski, MA, R. Perkins, Poli, F., G. Taylor, Ren, Y, M.D. Boyer, Y. Ren, Guttenfelder, W, C.E. Myers, F. Ebrahimi, Scotti, F., Stoltzfus-Dueck, T, Jarboe, T., Ono, M., Luhmann Jr., N., R.J. La Haye, Schuster, E, K. Gan, Andre, R, R. Andre, Heidbrink, W., Kubota, S, C.H. Skinner, La Haye, RJ, Rowley, C, B.P. LeBlanc, M. Ono, Delgado-Aparicio, L., Fonck, R, Jardin, S, Stratton, B, Stoltzfus-Dueck, T., Gerhardt, S, Guttenfelder, W., Koel, B, Perkins, R, D.M. Kriete, R. Fonck, S. Gerhardt, Darrow, D., Kolemen, Egemen, Bhattacharjee, A, J.-K. Park, A. Bhattacharjee, R. Maingi, Jaworski, M.A., R. Maqueda, Jardin, S., Bell, R.E., Ferron, J, Meier, E, Fonck, R., Rowley, C., Z. Wang, J. Hosea, S.A. Sabbagh, Sabbagh, SA, Maqueda, R., C. Rowley, Maqueda, R, J.P. Allain, J. Riquezes, Zweben, S.J., Mueller, D., H. Yuh, D. Mueller, F. Poli, Darrow, D, Goumiri, I, Myers, C.E., Buttery, R, Finkenthal, M, Gates, D, E. Schuster, I. Waters, Scotti, F, Allain, J.P., Frerichs, H, E. Kolemen, Smith, D.R., Ahn, J-W, R. Lunsford, Humphreys, D, Canal, G., O. Schmitz, J.-W. Ahn, N. Bertelli, Canik, J., Kolemen, E., S. Ku, Ferrraro, N., Boyer, MD, S.J. Zweben, Stratton, B., C.S. Chang, Menard, JE, Kolemen, E, F. Scotti, Brennan, D., Riquezes, J., H. Frerichs, Bertelli, N, W. Wang, Belova, E., Kaye, S.M., Lunsford, R, Levinton, F., W. Guttenfelder, Chang, C.S., Yuh, H, Crocker, N., Liu, D., B. Koel, Koel, B., D. Liu, B. Stratton, T. Gray, Waters, I., McKee, G., R. Raman, Tritz, K., Ethier, S, Levinton, F, S. Jardin, Park, J.-K., Yuh, H., N. Gorelenkov, Ferron, J., Bell, RE, Russell, D., Riquezes, J, Bertelli, N., Y. Sechrest, Rhodes, T, Capece, A., Andre, R., Ethier, S., R. Barchfeld, Boyle, D., Chang, CS, LeBlanc, BP, Schmitz, O, S. Kubota, Barchfeld, R., Skinner, C.H., Sabbagh, S.A., Humphreys, D., Wirth, B, J.E. Menard, Meier, E., Diallo, A., Podesta, M., D.J. Battaglia, Luhmann, N, Domier, C, Canik, J, Barchfeld, R, Mueller, D, Kriete, D.M., Gates, D., Taylor, G., Ahn, J.-W., Hosea, J, N. Crocker, P. Beiersdorfer, T. Stoltzfus-Dueck, Gorelenkov, N, Ku, S., Ferraro, N, D. Darrow, Beiersdorfer, P, Lunsford, R., Beiersdorfer, P., Waters, I, Ku, S, G. McKee, Bhattacharjee, A., Brennan, D, Buttery, R., R. Buttery, J. Ferron, Boyer, M.D., J.W. Berkery, E. Meier, Belova, E, Crocker, N, E. Belova, Kaita, R., Ebrahimi, F, Fredrickson, E, Maingi, R, D.R. Smith, F. Levinton, T. Jarboe, Gan, K., LeBlanc, B.P., Gray, T., S.M. Kaye, I. Goumiri, D. Russell, Canal, G, T. Evans, Gorelenkov, N., K. Tritz, D. Stutman, Wang, W., Skinner, CH, S. Ethier, Reinke, M   +295 more
core   +1 more source

Excitation of toroidally localized harmonics of global Alfvén eigenmodes

Nuclear Fusion, 2023
The spherical tokamak NSTX and the upgraded, higher toroidal field, NSTX-U, routinely create plasmas with large un-thermalized populations of super-Alfvénic fast ions.
E.D. Fredrickson
doaj   +1 more source

Design of the Synthetic Aperture Microwave Imager Upgrade for measurement of the edge current density on MAST-U [PDF]

EPJ Web of Conferences, 2019
The Synthetic Aperture Microwave Imager (SAMI) has demonstrated the feasibility of 2D Doppler backscattering for measurement of the edge magnetic pitch angle on MAST and NSTX-U.
Allen J.O., Vincent C. H., Vann R. G. L.
doaj   +1 more source

Onset of High-Harmonic Fast Wave Propagation in Annulus Geometry [PDF]

EPJ Web of Conferences
Previous experiments on NSTX have reported high-harmonic fast wave (HHFW) power losses in the scrape-off layer (SOL), with dependencies on the wave parallel wavenumber, plasma density, and magnetic field.
Baek Seung-Gyou, De Levante Rodriguez Ricardo, Bertelli Nicola, Bonoli Paul, Shiraiwa Syun’ichi   +4 more
doaj   +1 more source

Nonlinear simulations of GAEs in NSTX-U

Physics of Plasmas
A set of nonlinear simulations has been performed in order to study the nonlinear evolution of unstable global Alfvén eigenmodes in the National Spherical Torus Experiment-Upgrade (NSTX-U). Results of the single toroidal mode number, n, simulations are compared with a full nonlinear simulation (all toroidal harmonics included). In single-n simulations,
E. V. Belova, E. D. Fredrickson, N. A. Crocker   +2 more
openaire   +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  

NSTX-U In-Vessel Control Coils' Design Concept

IEEE Transactions on Plasma Science, 2018
A successful conceptual design was completed to develop in-vessel control coils [non-axisymmetric control coils (NCCs)]. The NCCs are a series of saddle coils that are intended to satisfy a number of physics criteria including magnetic breaking, error field control, fast resistive wall mode (RWM) control, and edge-localized-mode stabilization ...
González Teodoro, Jorge Rafael, cai, dang, Dellas, John   +2 more
openaire   +2 more sources