Results 41 to 50 of about 20,009 (190)

Modeling non-stationary, non-axisymmetric heat patterns in DIII-D tokamak

, 2016
Non-axisymmetric stationary magnetic perturbations lead to the formation of homoclinic tangles near the divertor magnetic saddle in tokamak discharges.
Caldas, I. L., Ciro, D., Evans, T. E.
core   +1 more source

Dimensionless size scaling of intrinsic rotation in DIII-D [PDF]

, 2016
A dimensionless empirical scaling for intrinsic toroidal rotation is given: M-A similar to beta(N)rho*, where M-A is the toroidal velocity divided by the Alfven velocity, beta(N) is the usual normalized beta value, and rho* is the ion gyroradius divided ...
deGrassie, JS, Noterdaeme, Jean-Marie, Rice, JE, Solomon, WM   +3 more
core   +2 more sources

MHD stability of negative triangularity DIII-D plasmas

Nuclear Fusion, 2023
Negative triangularity (NT) experiments in DIII-D point to an emergent reactor scenario free of sawteeth, endowed with benign, nondisruptive n = 2 tearing modes, which experience q _min $ \geqslant $ 1 similar to the positive triangularity hybrid ...
W. Boyes, F. Turco, J. Hanson, A. Marinoni, A. Turnbull, M. Austin, G. Navratil   +6 more
doaj   +1 more source

13C surface characterization of midplane and crown collector probes on DIII-D

Nuclear Materials and Energy, 2023
A dual collector probe system has been implemented on DIII-D for scrape-off-layer (SOL) impurity transport studies. These experiments injected isotopically enriched methane (13CD4) and sampled the impurities from this extrinsic, primary source with ...
J.D. Duran, D.C. Donovan, J.H. Nichols, E.A. Unterberg, S.A. Zamperini, T. Abrams, R. Perillo, J. Ren, D.L. Rudakov, M.W. Shafer, P.C. Stangeby, D.A. Taussig, R.S. Wilcox, M.P. Zach   +13 more
doaj   +1 more source

Metamaterial lens of specifiable frequency-dependent focus and adjustable aperture for electron cyclotron emission in the DIII-D tokamak

, 2013
Electron Cyclotron Emission (ECE) of different frequencies originates at different locations in non-uniformly magnetized plasmas. For simultaneous observation of multiple ECE frequencies from the outside edge of a toroidal plasma confinement device (e.g.
Capecchi, W. J., Hammond, K. C., Massidda, S. D., Volpe, F. A.   +3 more
core   +1 more source

Applications of ECH on the DIII-D tokamak and projections for future ECH upgrades

EPJ Web of Conferences, 2012
Electron Cyclotron Heating and Current Drive plays an important role in the DIII-D program. In high performance discharges EC power contributes greatly to MHD stability, and this is particularly important for discharges with low rotational torque applied,
Solomon W.M., Politzer P.A., Petty C.C., Luce T.C., Lohr J.M., La Haye R.J., Jackson G.L., Holcomb C.T., Garofalo A., Ferron J.R., DeBoo J., Buttery R.J., Prater R., Turco F.   +13 more
doaj   +1 more source

Cooperative program on DIII-D [PDF]

, 1991
The main contribution of the Berkeley group to data has concerned ion temperature profile data reduction and transport analysis using this data. In addition, our graduate students have worked on fundamental aspects of transport theory, under the guidance of the Principal Investigator, to prepare them for productive participation in the D3-D program ...
openaire   +2 more sources

Gyrokinetic analysis and simulation of pedestals, to identify the culprits for energy losses using fingerprints

, 2019
Fusion performance in tokamaks hinges critically on the efficacy of the Edge Transport Barrier (ETB) at suppressing energy losses. The new concept of fingerprints is introduced to identify the instabilities that cause the transport losses in the ETB of ...
Chankin, A., Contributors, JET, Diallo, A., Giroud, C., Groebner, R., Hatch, D. R., Hillesheim, J. C., Koechl, F., Kotschenreuther, M., Liu, X., Maggi, C. F., Mahajan, S., Parail, V., Saarelma, S., Solano, E., TEAM, the DIII-D, Zheng, L.   +16 more
core   +1 more source

Impact of ionization and transport on pedestal density structure in DIII-D and Alcator C-Mod

Nuclear Fusion
This paper investigates the role of ionization on the pedestal structure using both measurements and modeling for H-mode plasmas on DIII-D and Alcator C-Mod to enhance our ability to predict pedestal behavior in future pilot plants.
S. Mordijck, R.A. Chaban, R. Reksoatmodjo, J.J. Balbin-Arias, Y. Chuang, J. Loughran, J.W. Hughes, A.M. Rosenthal, M.A. Miller, T. Wilks, F.M. Laggner, T. Osborne   +11 more
doaj   +1 more source

Visualizing DIII-D Tokamak magnetic field lines

Proceedings Visualization 2000. VIS 2000 (Cat. No.00CH37145), 2002
We demonstrate the use of a combination of perceptually effective techniques for visualizing magnetic field data from the DIII-D Tokamak. These techniques can be implemented to run very efficiently on machines with hardware support for OpenGL. Interactive speeds facilitate clear communication of magnetic field structure, enhancing fusion scientists ...
Schussman, Greg, Ma, Kwan-Liu, Schissel, David, Evans, Todd   +3 more
openaire   +2 more sources