BECOOL: Ballooning eigensolver with COOL finite elements (2009)
Cooper, G.A., Graves, J.P., Cooper, W.A., Gruber, R., Peterson, R.S.
An incompressible variational ideal ballooning mode equation is discretized with the COOL finite element discretization scheme using basis functions composed of variable order Legendre polynomials....
Matsuyama, A., Isaev, M.Yu., Watanabe, K.Y., Hanatani, K., Suzuki, Y., Nakajima, N., ...
To evaluate the bootstrap current in nonaxisymmetric toroidal plasmas quantitatively, a deltaf Monte Carlo method is incorporated into the moment approach. From the drift-kinetic equation with the...
A. A. Turnipseed, S. N. Pressley, T. Karl, B. Lamb, E. Nemitz, E. Allwine, ...
The concept of disjunct eddy sampling (DES) for use in measuring ecosystem-level micrometeorological fluxes is re-examined. The governing equations are discussed as well as other practical...
Three-dimensional anisotropic pressure free boundary equilibria (2009)
Cooper, W. A., Hirshman, S. P., Merkel, P., Graves, J. P., Kisslinger, J., Wobig, H. F. G., ...
Impact of pressure anisotropy on tokamak equilibria and the toroidal magnetic precession (2008)
Jucker, M., Graves, J.P., Cooper, G.A., Cooper, W.A.
Using a generalized anisotropic tokamak equilibrium and an exact guiding centre drift formulation, the effect of parallel and perpendicular anisotropy on the toroidal precession drift is...
Monte Carlo ICRH simulations in fully shaped anisotropic plasmas (2008)
Jucker, M., Graves, J.P., Cooper, W.A., Mellet, N., Brunner, S.
This work shows a self-consistent numerical model of ion cyclotron resonant heating (ICRH) in a plasma of arbitrary (2D or 3D) geometry. Effects of anisotropy and full shaping on both MHD equilibrium...
3D Plasma Equilibrium and Stability with Hot Particle Anisotropic Pressure (2008)
Cooper, W.A., Graves, J.P., Hirshman, S.P., Merkel, P., Kisslinger, J., Wobig, H.F.G., ...
Monte Carlo ICRH simulations in fully shaped anisotropic plasmas (2008)
Jucker, M., Graves, J. P., Cooper, W.A., Mellet, N., Brunner, S.
Search for very-high-beta MHD stability quasi-isodynamic configurations (2008)
Bovshuk, V.R., Cooper, W.A., Mikhailov, M.I., Nuehrenberg, J., Shafranov, V.D.
LHD Bootstrap Current Coefficient Calculations with the VENUS+δ f code (2008)
Isaev, M.Yu, Watanabe, K.Y., Yokoyama, M., Ohyabu, N., Beidler, C.D., Maassberg, H., ...
3D Plasma Equilibrium and Stability with Hot Particle Pressure Anisotropy (2008)
Cooper, W.A., Graves,J.P., Hirshman, S.P., Merkel, P., Kisslinger, J., Wobig, H., ...
A new iterative method to compute the dielectric tensor in the low-frequency wave code LEMan (2008)
Mellet, N., Cooper, W.A., Jucker, M., Graves, J.P., Villard, L.
Characteristics of Magnetohydrodynamics of IDB Plasma in LHD (2008)
Narushima, Y., Watanabe, K.Y., Sakamoto, R., Suzuki, Y., Sakakibara, S., Ohdachi, S., ...
MHD Stability Analysis of IDB Plasma in LHD (2008)
Narushima, Y., Watanabe, K.Y., Sakamoto, R., Yamada, I., Narihara, K., Suzuki, Y., ...
A. A. Turnipseed, S. N. Pressley, T. Karl, B. Lamb, E. Nemitz, E. Allwine, ...
The concept of disjunct eddy sampling (DES) for use in measuring ecosystem-level micrometeorological fluxes is re-examined. The governing equations are discussed as well as other practical...
Anderson Localization of Ballooning Modes, Quantum Chaos and the (2007)
Stability Of Compact, J. L. Johnson, S. Klasky, J. Canik, R. L. Dewar, ...
mathematical concepts and terminology, not usually found in plasma physics (broken symmetry, localization of eigenfunctions, quantum chaos, eigenvalue isosurface topologies), have crossed the...
Search for quasi-isodynamic configurations with diminished parallel current density (2007)
Bovshuk, V.R., Cooper, W.A., Mikhailov, M.I., Nührenberg, J., Shafranov, V.D.
Fluid Plasma Stability in Stellarators with Anisotropic Energetic Species (2007)
Cooper, W.A., Graves, J.P., Jucker, M., Watanabe, K.Y., Narushima, Y.
Search for quasi-isodynamic configurations with diminished Pfirsch-Schlueter current (2007)
Bovshuk, V.R., Cooper, W.A., Isaev, M.Yu., Mikhailov, M.I., Nuehrenberg, J., Shafranov, V.D., ...
Computational fusion plasma physics (2007)
Villard, L., Tran, T.M., Allfrey, S.J., Angelino, P., Bottino, A., Brunner, S., ...
Computational fusion plasma physics (2007)
Villard, L., Tran, T.M., Allfrey, S.J., Angelino, P., Bottino, A., Brunner, S., ...
3D warm effects for low-frequency wave propagation in magnetically confined plasmas (2007)
Mellet, N., Cooper, W.A, Villard, L., Popovich, P., Brunner, S., Tran, T.M.
Search for very high-beta MHD stable quasi-isodynamic configurations (2007)
Boshuk, V.R., Cooper, W.A., Mikhailov, M.I., Nuehrenberg, J., Shafranov, V.D.
Search for very high-beta MHD stable quasi-isodynamic configurations (2007)
Boshuk, V.R., Cooper, W.A., Mikhailov, M.I., Nuehrenberg, J., Shafranov, V.D.
3-D ideal MHD stability of super dense core plasma in LHD (2007)
Narushima, Y., Watanabe, K.Y., Sakamoto, R., Suzuki, Y., Sakakibara, S., Ohdachi, S., ...
Free boundary three-dimensional anisotropic pressure equilibria (2007)
Cooper, W.A., Hirshman, S.P., Graves, J.P., Jucker, M., Kisslinger, J., Merkel, P., ...
Ideal magnetohydrodynamic stability of the NCSX (2007)
Fu, G. Y., Isaev, M., Ku, L. P., Mikhailov, M., Redi, M. H., Sanchez, R., ...
The ideal magnetohydrodynamic (MHD) stability of the National Compact Stellarator Experiment (NCSX) is extensively analyzed using the most advanced three-dimensional MHD codes. It is shown that the...
Fluid magnetohydrodynamic stabilit in a heliotron with anisotropic fast particle species (2007)
Cooper, W. A., Graves, J. P., Jucker, M., Watanabe, K. Y., Narushima, Y., Yamaguchi, T.
The local and global fluid magnetohydrodynamic stability properties of anisotropic pressure plasmas are investigated with the Kruskal-Oberman and rigid hot particle Johnson et al energy principles. A...
Venus+δf - A Bootstrap Current Calculation Module for 3D Configurations (2006)
Isaev, M.Yu., Brunner, S., Cooper, W.A., Bergmann, A., Beidler, C.D., Geiger, J., ...
Venus+δf - A Bootstrap Current Calculation Module for 3D Configurations (2006)
Isaev, M.Y., Brunner, S., Cooper, W.A., Tran, T.M., Bergmann, A., Beidler, C.D., ...
Magnetic Coils for a High-β Quasi-isodynamic Stellarator (2006)
Cooper, W.A., Drevlak, M., Isaev, M.Yu., Mikhailov, M.I., Nuehrenberg, J., Shafranov, V.D., ...
Magnetic Coils for a High-Beta Quasi-Isodynamic Stellarator (2006)
Cooper, W.A., Drevlak, M., Isaev, M.Yu, Mikhailov, M., Nuehrenberg, J., Shafranov, V.D., ...
Three-dimensional warm plasma simulations for low-frequency waves (2006)
Mellet, N., Popovich, P., Cooper, W.A., Villard, L., Brunner, S.
Subbotin, A. A., Mikhailov, M. I., Shafranov, V. D., Isaev, M. Y., Nuhrenberg, C., Nuhrenberg, J., ...
A quasi-isodynamic stellarator with poloidally closed contours of the magnetic field strength B (Mikhailov 2002 Nucl. Fusion 42 L23) has been obtained by an integrated physics optimization comprising...
A full-wave solver of the Maxwell's equations in 3D cold plasmas (2006)
Popovich, P., Cooper, W. A., Villard, L.
A new solver for Maxwell's equations in three-dimensional (3D) plasma configurations is presented. The new code LEMan (Low-frequency ElectroMagnetic wave propagation) determines a global solution of...
Venus plus delta f: A bootstrap current calculation module for 3-D configurations (2006)
Isaev, M. Y., Brunner, S., Cooper, W. A., Tran, T. M., Bergmann, A., Beidler, C. D., ...
A new three-dimensional code, VENUS+delta f, for neoclassical transport calculations in nonaxisymmetric toroidal systems is presented. Numerical drift orbits from the original VENUS code and the...
Cooper, W. A., Graves, J. P., Tran, T. M., Gruber, R., Yamaguchi, T., Narushima, Y., ...
The three-dimensional (3-D) VMEC code has been modified to model an energetic species with a variant of a Bi-Maxwellian distribution function that satisfies the constraint B . del F-h = 0, and the...
Cooper, W. A., Graves, J. P., Jucker, M., Isaev, M. Y.
A Hamiltonian formulation of the relativistic guiding center drifts is extended to anisotropic pressure plasmas. The magnetic coordinates devised by Boozer are adapted to the anisotropic pressure...
Cooper, W. A., Graves, J. P., Hirshman, S. P., Yamaguchi, T., Narushima, Y., Okamura, S., ...
A formulation of the anisotropic pressure magnetohydrodynamic equilibrium problem for three-dimensional plasmas with imposed nested magnetic surfaces is developed based on a bi-Maxwellian model of...
Alpha-particle Confinement and Conservation of Second Adiabatic Invariant (2005)
Cooper, W.A., Isaev, M.Y., Mikhailov, M.I., Nuehrenberg, J., Okamura, S., Shafranov, V.D., ...
Effects of global MHD instability on operational high beta-regime in LHD (2005)
Watanabe, K. Y., Sakakibara, S., Narushima, Y., Funaba, H., Narihara, K., Tanaka, K., ...
In the Large Helical Device (LHD), the highest operational averaged beta value has been expanded from 3.2% to 4% in the last 2 years by increasing the heating capability and exploring a new magnetic...
Cooper, W. A., Hirshman, S. P., Yamaguchi, T., Narushima, Y., Okamura, S., Sakakibara, S., ...
Fixed boundary three-dimensional anisotropic pressure equilibria are computed that are consistent with a family of distribution functions that load particles preferentially towards v parallel to...
Results of Integrated Optimization of N=9 Quasi-isodynamic stellarator (2004)
Shafranov, V. D., Cooper, W. A., Heyn, M. F., Isaev, M. Yu., Kalyuzhnyj, V. N., Kasilov, S. V., ...
Bootstrap Current and MHD Stability in a Four-period Helias Reactor Configuration (2004)
Cooper, W. A., Andreeva, T., Beidler, C. D., Igitkhanov, Y., Kisslinger, J., Isaev, M.Yu., ...
Alfvén and IC frequency oscillations in 2D and 3D geometries calculated with a global 3D code (2004)
Three-dimensional full-wave propagation code for cold plasma (2004)
Popovich, P., Cooper, W. A., Villard, L.
Electromagnetic wave propagation in the Alfven frequency range in two-dimensional (2-D) and three-dimensional (3-D) plasma configurations is investigated by using a recently developed full-wave code,...
Confinement characteristics of the quasi-axisymmetric stellarator CHS-qa (2004)
Okamura, S., Matsuoka, K., Nishimura, S., Isobe, M., Suzuki, C., Shimuzu, A., ...
A low aspect ratio stellarator CHS-qa with a quasi-axisymmetric configuration has been designed at NIFS, whose main objective is the experimental study of confinement improvement. The high beta...
Review on the progress of the LHD experiment (2004)
Motojima, O., Yamada, H., Komori, A., Watanabe, K. Y., Mutoh, T., Takeiri, Y., ...
Recent progress in the Large Helical Device (LHD) experiment during the last 2 yr is reviewed. The LHD has been extending its operational regime toward fusion-relevant conditions while taking...
Bootstrap current and quasi-symmetry in reactor-size stellarators (2004)
Margalet, S. F. I., Cooper, W. A., Allfrey, S. J., Popovitch, P., Isaev, M. Y.
The impact of the bootstrap current (BC) has become an important issue in the modeling of quasi-symmetric stellarator devices. Magnetohydrodynamic equilibria have been calculated with self-consistent...
Cooper, W. A., Margalet, S. F. I., Allfrey, S. J., Kisslinger, J., Wobig, H. F. G., Narushima, Y., ...
The impact of the bootstrap current is investigated on the equilibrium properties of a two-period quasi-axisymmetric stellarator reactor with free boundary and on the corresponding ideal...
Norton, Andrew (ed.), Cooper, W.A. (W. Alan)
Contenido: Parte I Técnicas: 1) La noche celeste, astronomía de posición; 2) Telescopios; 3) Espectrógrafos; 4) Detectores astronómicos; 5) Reductores de datos CCD [Charge-Coupled Device]; 6)...
A new class of quasi-omnigenous configurations (2003)
Isaev, M. Yu., Nührenberg, J., Mikhailov, M. I., Cooper, W. A., Watanabe, K. Y., Yokoyama, M., ...
An approximation to a quasi-omnigenous structure of the magnetic field strength has been numerically obtained by optimization of the magnetic configuration of a conventional heliotron/torsatron. This...
New Schemes for Confinement of Fusion Products in Stellarators (2003)
Nührenberg, J., Cooper, W. A., Isaev, M. Yu., Heyn, M. F., Kalyuzhnyi, V. N., Kasilov, S. V., ...
The condition of poloidal closure of the contours of the second adiabatic invariant for all reflected particles is studied for stellarators with poloidally closed contours of the magnetic field...
OPTIMIZED POLOIDAL PSEUDOSYMMETRY FOR TOROIDAL SYSTEMS (2003)
Shafranov, V. D., Cooper, W. A., Isaev, M. Yu., Mikhailov, M. I., Nührenberg, J., Samitov, M. A., ...
Compact Torsatron with Improved α-Particle Confinement (2003)
Isaev, M. Yu., Grebenshchikov, S. E., Shchepetov, S. V., Nührenberg, J., Cooper, W. A.
The compact conventional six-period torsatron L-V with an aspect ratio of A = 3 has been considered as a starting point for further computational optimization of the collisionless confinement of the...
Subbotin, A. A., Cooper, W. A., Mikhailov, M. I., Nührenberg, J., Samitov, M. A., Shafranov, V. D., ...
Optimized poloidal pseudosymmetry for toroidal systems (2003)
Shafranov, V.D., Cooper, W.A., M.Yu., Isaev, Mikhailov, M.I., Nuehrenberg, J., Samitov, M.A., ...
Equilibrium and stability for compact stellarators (2003)
Turnbull, A.D., L.L., Lao, Cooper, W.A., Garabedian, P., L.P., Ku, Zarnstorff, M.C.
Impact of heat deposition profile on global confinement of NBI heated plasmas in the LHD (2003)
Yamada, H., Murakami, S., Yamazaki, K., Kaneko, O., Miyazawa, J., Sakamoto, R., ...
Energy confinement and heat transport of net-current-free NBI heated plasmas in the large helical device (LHD) are discussed with emphasis on density and power deposition profile dependences....
Low-n ideal MHD analysis in limiter plasma on LHD (2003)
Narushima, Y., Sakakibara, S., Watanabe, K., Nishimura, K., Yamada, H., Nakajima, N., ...
Recent advances in the LHD experiment (2003)
Motojima, O., Ohyabu, N., Komori, A., Kaneko, O., Yamada, H., Kawahata, K., ...
In the first four years of the LHD experiment, several encouraging results have emerged, the most significant of which is that MHD stability and good transport are compatible in the inward shifted...
A new class of quasi-omnigenous configurations (2003)
Isaev, M. Y., Nuhrenberg, J., Mikhailov, M. I., Cooper, W. A., Watanabe, K. Y., Yokoyama, M., ...
An approximation to a quasi-omnigenous structure of the magnetic field strength has been numerically obtained by optimization of the magnetic configuration of a conventional heliotron/torsatron. This...
Compact torsatron with improved alpha-particle confinement (2003)
Isaev, M. Y., Grebenshchikov, S. E., Shchepetov, S. V., Nuhrenberg, J., Cooper, W. A.
The compact conventional six-period torsatron L-V with an aspect ratio of A = 3 has been considered as a starting point for further computational optimization of the collisionless confinement of the...
Cooper, W. A., Margalet, S. F., Allfrey, S. J., Isaev, M. Y., Mikhailov, M. I., Shafranov, V. D., ...
In current-free stellarators, the parallel current density is normally too weak to drive global external kink modes. However, at finite values of beta, the bootstrap current (BC) can provide...
Mikhailov, M. I., Shafranov, V. D., Subbotin, A. A., Isaev, M. Y., Nührenberg, J., Zille, R., ...
The possibility of fulfilling the condition of poloidal closure of the contours of the second adiabatic invariant for all reflected particles is studied for systems with poloidally closed contours of...
3D equlibrium averaged description and consistency check (2002)
Cooper, W. A., Nührenberg, J., Drozdov, V., Ivanov, A. A., Martynov, A. A., Medvedev, S. Yu., ...
Quasi-isodynamical configurations without transitional particle orbits (2002)
Subbotin, A. A., Cooper, W. A., Isaev, Yu M., Mikhailov, M. I., Nührenberg, J., Heyn, M. F., ...
3D Equilibrium Averaged Description and Consistency Check (2002)
Cooper, W.A., Nuehrenberg, J., Drozdov, V.V., Ivanov, A.A., Martynov, A.A., Medvedev, S.Yu., ...
Microinstability studies for the large helical device (2002)
Rewoldt, G., Ku, L. P., Tang, W. M., Sugama, H., Nakajima, N., Watanabe, K. Y., ...
Fully kinetic assessments of the stability properties of toroidal drift modes have been obtained for cases for the large helical device (LHD). This calculation employs the comprehensive linear...
Redi, M. H., Johnson, J. L., Klasky, S., Canik, J., Dewar, R. L., Cooper, W. A.
The radially local magnetohydrodynamic (MHD) ballooning stability of a compact, quasiaxially symmetric stellarator (QAS), is examined just above the ballooning beta limit with a method that can lead...
Mikhailov, M. I., Shafranov, V. D., Subbotin, A. A., Isaev, M. Y., Nuhrenberg, J., Zille, R., ...
The possibility of fulfilling the condition of poloidal closure of the contours of the second adiabatic invariant for all reflected particles is studied for systems with poloidally closed contours of...
Neoclassical transport and alpha particle confinement in novel 3-D reactor systems (2002)
Fischer, O., Cooper, W. A., Isaev, M. Y., Villard, L.
Neoclassical transport and a particle confinement are analysed for three 3-D reactor designs-the QAS3, the ST/sphellamak hybrid and the sphellamak-using the VENUS code. It is observed that neither...
Cooper, W. A., Margalet, S. F., Allfrey, S. J., Isaev, M. Y., Mikhailov, M. I., Shafranov, V. D., ...
In current-free stellarators, the parallel current density is normally too weak to drive global external kink modes. However, at finite values of beta, the bootstrap current (BC) can provide...
Optimization of N="6" Helias-Type Stellarator (2001)
Subbotin, A. A., Mikhailov, M.I., Nührenberg, J., Isaev, M.Yu., Cooper, W.A ., Heyn, M.F., ...
Recent Advances in the Design of Quasi-Axisymmetric Stellarator Plasma Configurations (2001)
Reiman, A., Ku, L., Monticello, D., Hirshman, S., Hudson, S., Kessel, C., ...
Physics of the compact advanced stellarator NCSX. Invited Paper (2001)
Zarnstorff, M.C., Berry, L.A., Brooks, A., Frederickson, E., Hirshman, S., ...
Recent Progress in MHD Stability Calculations of Compact Stellarators (2001)
Fu, G.Y., Ku, L.P., Redi, M.H., Kessel, C., Monticello, D., Reiman, A., ...
Physics Issues in the Design of Low Aspect Ratio, High-Beta, Quasi-Axisymmetric Stellarators (2001)
Zarnstorff, M.C., Berry, L.A., Boozer, A.H., Brooks, A., Cooper, W.A., Drevlak, M., ...
Cobra-terpsichore benchmark for the compact stellarator NCSX (2001)
Cooper, W.A., Sanchez, R., Hirshman, S.P., L.P., Ku, Isaev, M., G.Y., Fu, ...
Localized ballooning modes in compact quasiaxially symmetric stellarators (2001)
M.H., Redi, Canik, J., Dewar, R.L., Fredrickson, E.D., Cooper, W.A., Johnson, J.L., ...
Plasma and impurity transport modeling of NBI-heated LHD and helical reactor systems (2001)
Yamazaki, K., Tokar, M., Funaba, H., Peterson, B.J., Noda, N., Cooper, W.A., ...
Physics of the compact advanced stellarator NCSX (2001)
Zarnstorff, M. C., Berry, L. A., Brooks, A., Fredrickson, E., Fu, G. Y., Hirshman, S., ...
Compact optimized stellarators offer novel solutions for confining high-beta plasmas and developing magnetic confinement fusion. The three-dimensional plasma shape can be designed to enhance the...
Configuration flexibility and extended regimes in Large Helical Device (2001)
Yamada, H., Komori, A., Ohyabu, N., Kaneko, O., Kawahata, K., Watanabe, K. Y., ...
Recent experimental results in the Large Helical Device have indicated that a large pressure gradient can be formed beyond the stability criterion for the Mercier (high-n) mode. While the stability...
Ideal MHD stability calculations for compact stellarators (2001)
Sanchez, R., Isaev, M. Y., Hirshman, S. P., Cooper, W. A., Fu, G. Y., Jimenez, J. A., ...
Stability results for high-n ideal local pressure-driven instabilities (ballooning and interchange: modes) are calculated from the COBRA and TERPSICHORE codes and compared for several low aspect...
Recent advances in the design of quasiaxisymmetric stellarator plasma configurations (2001)
Reiman, A., Ku, L., Monticello, D., Hirshman, S., Hudson, S., Kessel, C., ...
Strategies for the improvement of quasiaxisymmetric stellarator configurations are explored. Calculations of equilibrium flux surfaces for candidate configurations are also presented. One...
Global linear gyrokinetic simulations in quasi-symmetric configurations (2001)
Jost, G., Tran, T. M., Cooper, W. A., Villard, L., Appert, K.
First global linear study of electrostatic drift waves in two realistic quasisymmetric configurations, namely the Quasi-Axially symmetric Stellarator with three fields periods (QAS3) [P. Garabian and...
Cooper, W. A., Okamura, S., Yamazaki, K.
Finite toroidal plasma current reduces the magnitude of the normal magnetic field line curvature near midvolume in a quasiaxisymmetric stellarator. This improves the ideal ballooning stability...
Stability and transport of compact quasi-axially symmetric stellarators (2000)
M.H., Redi, Cooper, W.A., Diallo, A., G.Y., Fu, Nuehrenberg, C., Reiman, A.H., ...
Recent microinstability results for nonaxisymmetric systems (2000)
Rewolt, G., Tang., W.M., Sugama, H., Nakajima, N., Watanabe, K.Y., ...
Advances in global linear gyrokinetic simulations (2000)
Villard, L., Appert, K., Cooper, W.A., Falchetto, G., Jost, G., Maccio, M., ...
Drift mode calculations for the Large Helical Device (2000)
Rewoldt, G., Ku, L. P., Tang, W. M., Sugama, H., Nakajima, N., Watanabe, K. Y., ...
A fully kinetic assessment of the stability properties of toroidal drift modes has been obtained for a case for the Large Helical Device [A. Iiyoshi et al., Nucl. Fusion 39, 1245 (1999)]. This...
Redi, M. H., Diallo, A., Cooper, W. A., Fu, G. Y., Nuhrenberg, C., Pomphrey, N., ...
Concerns about the flexibility and robustness of a compact quasiaxial stellarator design are addressed by studying the effects of varied pressure and rotational transform profiles on expected...
Physics issues in the design of high-beta, low-aspect-ratio stellarator experiments (2000)
Neilson, G. H., Reiman, A. H., Zarnstorff, M. C., Brooks, A., Fu, G. Y., Goldston, R. J., ...
High-beta, low-aspect-ratio ("compact") stellarators are promising solutions to the problem of developing a magnetic plasma configuration for magnetic fusion power plants that can be sustained in...
Magnetohydrodynamics stability of compact stellarators (2000)
Fu, G. Y., Ku, L. P., Cooper, W. A., Hirshman, S. H., Monticello, D. A., Redi, M. H., ...
Recent stability results of external kink modes and vertical modes in compact stellarators are presented. The vertical mode is found to be stabilized by externally generated poloidal flux. A simple...
Magnetic topology and guiding centre drift orbits in a reversed shear tokamak (2000)
Fischer, O., Cooper, W. A., Villard, L.
The magnetic topology and particle drift orbits are analysed in a monotonic q profile and in a reversed shear TEXTOR equilibrium that is subject to a magnetic perturbation driven by the Dynamic...
Effect of helical coils on the magnetic field and the stability of a compact toroidal plasma (2000)
Cooper, W. A., Todd, T. N., Allfrey, S., Hender, T. C., Robinson, D. C.
The helical distortion of a compact tokamak plasma with currents in modular Furth-Hartman type coils is investigated with respect to the impact on the magnetic field structure and to the ideal...
Stability of a compact three-period stellarator with quasiaxial symmetry features (2000)
The ideal magnetohydrodynamic stability properties of a three-field period stellarator with quasiaxial symmetry features proposed by Garabedian and Ku [Phys. Plasmas 6, 645 (1999)] are investigated....
Local three-dimensional MHD stability in equilibrium optimized coordinates (2000)
The linear equation for ideal magnetohydrodynamic ballooning modes in three-dimensional configurations is derived in the coordinate system that is optimal for the representation of the equilibrium...
Effect of helical coils on the magnetic field and the stability of a compact toroidal plasma (2000)
Cooper, W.A., Todd, T.N., Allfrey, S., Hender, T.C., Robinson, D.C.
MHD stability of compact stellarators (1999)
G.Y., Fu, L.P., Ku, Cooper, W.A., Hirshman, S.H., Monticello, D.A., M.H., Redi, ...
Disruption studies of current-carrying plasmas in the upgrade compact Auburn torsatron (1999)
Knowlton, S., Gandy, R., Hanson, J., Hartwell, G., Watts, C., Cooper, W.A.
Improved stellarator systems, Invited Paper (1999)
Mikhailov, M.I., Cooper, W.A., M.Yu., Isaev, Shafranov, V.D., Skovoroda, A.A., Subbotin, A.A.
Physics basis for high-beta, low-aspect-ratio stellarator experiments (1999)
Neilson, G.H., Hirshman, S.P., Boozer, A.H., Miner, W.A., Cooper, W.A., Drevlak, M.
Optimisation of the stellarator systems: possible ways (1999)
Shafranov, V.D., Cooper, W.A., Isaev, M.Y., Leneva, A.E., Mikhailov, M.I., Subbotin, A.A.
Analytical and computational investigations of improved-confinement stellarators (1999)
Subbotin, A.A., Cooper, W.A., M.Yu., Isaev, Mikhailov, M.I., Nuehrenberg, J., Shafranov, V.D.
Effect of magnetic drifts on global ion-temperature-gradient modes in helical configurations (1999)
Villard, L., Vaclavik, J., Jost, G., Maccio, M., Cooper, W.A.
Drift mode calculations in nonaxisymmetric geometry (1999)
Rewoldt, G., Ku, L. P., Tang, W. M., Cooper, W. A.
A fully kinetic assessment of the stability properties of toroidal drift modes has been obtained for nonaxisymmetric (stellarator) geometry, in the electrostatic limit. This calculation is a...
Physics design of a high-beta quasi-axisymmetric stellarator (1999)
Reiman, A., Fu, G., Hirshman, S., Ku, L., Monticello, D., Mynick, H., ...
Key physics issues in the design of a high-beta quasi-axisymmetric stellarator configuration are discussed. The goal of the design study is a compact stellarator configuration with aspect ratio...
Discrete and continuum ballooning modes in a stellarator (1998)
Dewar, R.L., Cuthbert, P., Lewandowski, J.L.V., Jerome, L.W., Gardner, H.J., Singleton, D.B., ...
Physics considerations for the design of NCSX (1998)
Monticello, D.A., G.Y., Fu, Goldston, R., L.P., Ku, Cooper, W.A.
Rapid computing with TERPSICHORE and CAS3D MHD stability codes for a quasi-axial stellarator (1998)
M.H., Redi, Monticello, D.A., G.Y., Fu, Zarnstorff, M.C., Nuehrenberg, C., Cooper, W.A.
Physics design of a high b quasi-axisymmetric stellarator (1998)
Reimann, A., Goldston, R., Monticello, D., Mynick, H., Neilson, G.H., ...
Topologic study of a magnetic perturbation in a 3D free boundary plasma equilibrium (1998)
We have investigated the topological modification of an equilibrium with nested magnetic flux surfaces computed with the free boundary variational moments equilibrium code (VMEC) subject to an...
Mapping of a stochastic magnetic field in toroidal systems (1998)
The topological features of a stochastic magnetic field are investigated by the tracing of magnetic field lines. The first method consists of direct integration of the field line equations. An...
Quasi-two-dimensional waves in three-dimensional magnetic confinement systems (1998)
Dewar, R. L., Cuthbert, P., Lewandowski, J. L. V., Gardner, H. J., Singleton, D. B., Nakajima, N., ...
A reduced scalar magnetohydrodynamic (MHD) description for linear perturbations of arbitrary aspect-ratio, fully three-dimensional plasma configurations is derived for perturbations with short...
Toroidally localized and nonlocalized ballooning instabilities in a stellarator (1998)
Cuthbert, P., Lewandowski, J. L. V., Gardner, H. J., Persson, M., Singleton, D. B., Dewar, R. L., ...
It is shown that the coexistence of toroidally nonlocalized ideal-hydromagnetic ballooning instabilities, with a quasidiscrete spectrum, and toroidally localized ballooning instabilities with a broad...
Global ideal MHD stability of plasmas with toroidal, helical and vertical field coils (1998)
Ardelea, A., Cooper, W. A., Villard, L.
A simple configuration that consists of a set of toroidal, helical and vertical field coils is used to calculate free boundary equilibria with non-zero plasma current and approximately helically...
Few period quasisymmetric stellarators (1997)
M.Yu., Isaev, Cooper, W.A., Medvedev, S.Yu., Mikhailov, M.I., Shafranov, V.D., Subbotin, A.A.
MHD calculations for MHH2 (1997)
Reiman, A. H., Ku, L. P., Monticello, D. A., Nuhrenberg, C., Cooper, W. A.
A survey of the magnetohydrodynamic (MHD) properties of the quasi-axisymmetric configuration MHH2 has been performed using a suite of MHD codes: the PIES code at Princeton for studying loss of...
Plasma stability in heliac-like quasi-helically symmetric stellarators (1997)
Isaev, M.Yu., Cooper, W.A., Medvedev, S.Yu., Mikhailov, M.I., Shafranov, V.D., Subbotin, A.A.
Calculation of global modes via ballooning formalisms (1997)
Dewar, R. L., Cuthbert, P., Lewandowski, J. L. V., Gardner, H. J., Singleton, D. B., Persson, M., ...
Ballooning theory is an asymptotic method for treating modes with short wavelength across the magnetic field lines but essentially no phase variation along the lines. The latter constraint leads to...
Reversed magnetic shear is associated with large negative surface averaged parallel current densities that increase in magnitude towards the plasma edge and guarantee stability at large beta in...
Relativistic guiding centre drift orbits in canonical and magnetic coordinates (1997)
The Hamiltonian formulation of the guiding centre drift orbits for three-dimensional (3D) toroidal configurations with general time-dependent electric and magnetic field structures has been extended...
External kinks in plasmas with helical boundary deformation and net toroidal current (1997)
The global ideal magnetohydrodynamic (MHD) stability of plasmas with a prescribed helical boundary deformation and nonvanishing toroidal current is investigated with respect to the (m,n) external...
Local ideal magnetohydrodynamic stability of a quasihelically symmetric stellarator (1996)
Talmadge, Joseph N., Cooper, W.A.
This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying...
Local ideal magnetohydrodynamic stability of a quasihelically symmetric stellarator (1996)
Talmadge, J. N., Cooper, W. A.
The ideal magnetohydrodynamic stability with respect to localized ballooning modes and the Mercier criterion of a quasihelically symmetric stellarator configuration is investigated. Configurations...
Nakamura, Y., Matsumoto, T., Wakatani, M., Galkin, S. A., Drozdov, V. V., Martynov, A. A., ...
A particular configuration of the LHD stellarator with an unusually flat pressure profile has been chosen to be a test case for comparison of the MHD stability property predictions of different...
Spectrum of ballooning instabilities in a stellarator (1996)
Cooper, W. A., Singleton, D. B., Dewar, R. L.
The recent revival of interest in the application of the ''ballooning formaiism'' to low-frequency plasma instabilities has prompted a comparison of the Wentzel-Kramers-Brillouin (WKB) ballooning...
Stability calculations in MHD and plasmas (1994)
Cooper, W.A., Gruber, R., Merazzi, S., Anderson, D.V., Schwenn, U.
The local three-dimensional (3-D) ideal magnetohydrodynamic (MHD) stability properties of a 12-field period torsatron device of moderate aspect ratio are investigated as a function of an externally...
The local ideal three dimensional (3-D) magneto-hydrodynamic (MHD) stability for the Wendelstein VTI-X (W VII-X) configuration is studied. A volume averaged beta limit of 5% is confirmed with a...
Linear MHD stability computations in 3D plasmas (1992)
Cooper, W.A., Nakamura, Y., Wakatani, M., Gruber, R., Merazzi, S., Anderson, D.V., ...
Fu, G. Y., Cooper, W. A., Gruber, R., Schwenn, U., Anderson, D. V.
The TERPSICHORE three-dimensional linear ideal magnetohydrodynamic (MHD) stability code [Theory of Fusion Plasmas, Proceedings of the Joint Varenna-Lausanne International Workshop, Chexbres,...
3d Magnetohydrodynamic Equilibria with Anisotropic Pressure (1992)
Cooper, W. A., Hirshman, S. P., Merazzi, S., Gruber, R.
An energy functional given by W = integral integral integral d3x[B2/(2mu0) + p(parallel-to)/(GAMMA - 1)] is proposed as a variational principle to determine three-dimensional (3D) magnetohydrodynamic...
The linear MHD stability problem for 3D plasmas with noninteracting hot electron layers and nested magnetic flux surfaces in the absence of dissipation mechanisms is formulated in variational form....
Linear ideal magnetohydrodynamic stability computations in three dimensional plasmas (1991)
Anderson, D., Cooper, W.A., G.Y., Fu, Gruber, R., Merazzi, S., Schwenn, U.
Full 3D ideal MHD stability to low n and Mercier modes in l=2 Torsatrons (1991)
Anderson, D.V., Cooper, W.A., G.Y., Fu, Gruber, R., Merazzi, S., Schwenn, U.
Free boundary ideal magnetohydrodynamic stability of three-dimensional stellarators (1991)
Cooper, W.A., G.Y., Fu, Schwab, C., Schwenn, U., Gruber, R., Merazzi, S., ...
Ideal magnetohydrodynamic stability in three-dimensional plasmas (1991)
Cooper, W.A., G.Y., Fu, Gruber, R., Merazzi, S., Schwenn, U., Anderson, D.V.
Ideal Magnetohydrodynamic Stability Computations for 3-Dimensional Magnetic Fusion Devices (1991)
Gruber, R., Merazzi, S., Cooper, W. A., Fu, G. Y., Schwenn, U., Anderson, D. V.
Software-Development Strategies for Parallel Computer Architectures (1991)
Gruber, R., Cooper, W. A., Beniston, M., Gengler, M., Merazzi, S.
As pragmatic users of high performance supercomputers, we believe that nowadays parallel computer architectures with distributed memories are not vet mature to be used by a wide range of application...
The Terpsichore Code for the Stability Analysis of Magnetically Confined Fusion Plasmas (1991)
Anderson, D. V., Cooper, W. A., Gruber, R., Merazzi, S., Schwenn, U.
We describe a few relevant aspects of the new plasma physics stability code, TERPSICHORE, which breaks new ground both in plasma theory and in its algorithmic implementation. We chose a highly...
Global external ideal magnetohydrodynamic instabilities in three-dimensional plasmas (1990)
Cooper, W.A., G.Y., Fu, Gruber, R., Merazzi, S., Schwenn, U., Anderson, D.V.
Global ideal MHD stability of 3D plasmas with pseudo vacuum treatment for free-boundary modes (1990)
Schwenn, U., Anderson, D.V., Cooper, W.A., Gruber, R., Merazzi, S.
Low-n ideal MHD stability of tokamaks : current and beta limits (1989)
Turnbull, A.D., Yasseen, F., Roy, A., Sauter, O., Cooper, W.A., Nicli, S., ...
Beta-Limit in Tokamaks - Experimental and Computational Status (1988)
Troyon, F., Roy, A., Cooper, W. A., Yasseen, F., Turnbull, A.
Effects of Alpha-Populations on Tokamak Ballooning Stability (1987)
Spong, D. A., Sigmar, D. J., Tsang, K. T., Ramos, J. J., Hastings, D. E., Cooper, W. A.
MHD stability analysis for NET and INTOR (1987)
Yasseen, F., Cooper, W.A., Turnbull, A.D., Troyon, F., Roy, A.
Quasi-isodynamic configuration with poloidally closed contours of B and small number of periods
Samitov, M. A., Cooper, W. A., Isaev, M. Yu., Mikhailov, M. I., Nührenberg, J., Shafranov, V. D., ...
Mikhailov, M. I., Cooper, W. A., Isaev, M. Yu., Nührenberg, J., Samitov, M. A., Skovoroda, A. A., ...
Samitov, M. A., Cooper, W. A., Mikhailov, M. I., Nührenberg, J., Shafranov, V. D., Subbotin, A. A., ...
Shafranov, V. D., Cooper, W. A., Ivanov, A. A., Isaev, M. Yu., Martynov, A. A., Medvedev, S. Yu., ...
Subbotin, A. A., Cooper, W. A., Isaev, M. Yu., Mikhailov, M. I., Kalyuzhnyj, V. N., Kasilov, S. V., ...
Bootstrap Current and MHD Stability in a Four-period Helias Reactor Configuration
Cooper, W. A., Andreeva, T., Beidler, C. D., Igitkhanov, Y., Kisslinger, J., Isaev, M. Yu., ...
Comparison of the Properties of Quasi-Isodynamic Configurations for Different Numbers of Periods
Mikhailov, M. M., Cooper, W. A., Heyn, M. F., Isaev, M. Yu., Kalyuzhnyj, V. N., Kasilov, S. V., ...
Results of Integrated Optimization of N=9 Quasi-isodynamic stellarator
Shafranov, V. D., Cooper, W. A., Heyn, M. F., Isaev, M. Yu., Kalyuzhnyj, V. N., Kasilov, S. V., ...
VENUS+δf - A Bootstrap Current Calculation Module for 3D Configurations
Isaev, M. Yu., Brunner, S., Cooper, W. A., Tran, T. M., Bergmann, A., Beidler, C. D., ...
Quasi-isodynamic Configuration with Large Number of Periods
Shafranov, V. D., Cooper, W. A., Isaev, M. Yu., Kalyuzhnyj, V. N., Kasilov, S. V., Kernbichler, W., ...
Bootstrap Current Minimization in Quasi-isodynamic Configurations with Large Number of Periods
Mikhailov, M. I., Cooper, W. A., Isaev, M. Yu., Kalyuzhnyj, V. N., Kasilov, S. V., Kernbichler, W., ...
Search for very-high-beta MHD stable quasi-isodynamic configurations
Bovshuk, V. R., Cooper, W. A., Mikhailov, M. I., Nührenberg, J., Shafranov, V. D.
Search for quasi-isodynamic configurations with dimished parallel curent density
Bovshuk, V.R., Cooper, W.A., Mikhailov, M.I., Nührenberg, J., Shafranov, V.D.
Cooper, W A, Chan, C, Kwun, S Y, McCaughan, B, Kennedy, C, ...
Seng, T J, Currey, N, Cooper, W A, Lee, C-S, Chan, C, Horvath, L, ...
The significance of chromosome 3p gene alterations in lung cancer is poorly understood. This study set out to investigate promoter methylation in the deleted in lung and oesophageal cancer 1 (DLEC1),...