Results 121 to 130 of about 540 (146)

Electron ring startup model for ELMO Bumpy Torus

The Physics of Fluids, 1984
The microwave power requirements for EBT electron ring startup are calculated based on the assumption that the ring electrons originate as runaways accelerated by the first harmonic resonance of the extraordinary mode. The calculated microwave power threshold for startup is consistent with the experimental data for the microwave power requirements ...
Hamasaki, S., Krall, N. A., Sperling, J. L.   +2 more
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Ballooning modes in ELMO Bumpy Torus

The Physics of Fluids, 1983
A high mode number normal mode analysis is carried out for a straight bumpy cylinder model for the ELMO bumpy torus. Ballooning instability and steady oscillations are examined.
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Plasma properties in the ELMO bumpy torus

Plasma Physics, 1983
Experiments with 200 kW of applied electron cyclotron heating (ECH) power have demonstrated electron temperatures of about 1 keV in the ELMO Bumpy Torus-Scale (EBT-S) device. Electron densities are in the range of (0.5-1.5)*1018 m-3 and increase as the square root of the applied ECH power. A potential well is present, and its depth in V closely follows
R J Colchin, T Uckan, F W Baity, L A Berry, F M Bieniosek, L Bighel, W A Davis, E Dullni, H O Eason, J C Glowienka, G A Hallock, G R Haste, D L Hillis, A Komori, T L Owens, R K Richards, L Solensten, T L White, J B Wilgen   +18 more
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Modulational and filamentation instabilities in ELMO bumpy torus

Physica Scripta, 1991
An analytical investigation of modulational and filamentation instabilities of an upper-hybrid wave due to electron-acoustic density perturbations in a two-electron temperature plasma has been made. A hydrodynamical model of the plasma is used. Nonlinear dispersion relation and growth rates are calculated.
S Guha, Meenu Asthana, Ruby Sarkar
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Direct losses in the ELMO Bumpy Torus experiment

The Physics of Fluids, 1983
For resonant ions in the ELMO Bumpy Torus experiment (EBT), the width of the orbits near the resonance scales like (∂Ω/∂r)−1, where Ω is the precessional drift frequency. For (∂Ω/∂r)≊0 over most of the plasma, the ions will drift vertically out of the machine due to the toroidal magnetic field.
Hastings, D. E., Callen, J. D.
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Numerical Modeling of Elmo Bumpy Torus Plasmas

Nuclear Technology - Fusion, 1983
The extrapolation of the ELMO Bumpy Torus (EBT) confinement concept to the reactor regime involves many uncertainties, two of the most critical unknowns being: (a) the power required to sustain the steady-state high-beta annuli necessary for core plasma stabilization and (b) the propagation of ion cyclotron resonance heating (ICRH) waves in an ...
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Microwave heating of the ELMO Bumpy Torus relativistic electron ring

The Physics of Fluids, 1981
A model for microwave heating of electron rings in the ELMO Bumpy Torus configuration is analyzed using a relativistically correct quasi-linear formulation. The spatial locations of heating by the different electron-cyclotron harmonics are calculated. The steady-state ring energy and the microwave power required to sustain the rings are determined by ...
Hamasaki, S., Klein, H. H., Krall, N. A., McBride, John B., Sperling, J. L.   +4 more
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Scanning microwave interferometer for ELMO bumpy torus

Review of Scientific Instruments, 1983
A simple 4-mm scanning microwave interferometer has been developed and employed for electron density profile measurements on the ELMO bumpy torus (EBT). By making use of a pair of horizontally moving 45° mirrors that are located at the top and bottom of the plasma volume, the system avoids the deleterious effects of plasma sputtering and wall material ...
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Transport studies of ECH-heated bumpy torus plasmas in the Elmo Bumpy Torus(EBT) and in the Nagoya Bumpy Torus(NBT)

Nuclear Fusion, 1984
A model of the measured potential profile for ECH-heated plasmas in EBT/NBT is used in the radial-transport equations for bumpy tori. The particle and energy confinement times are predicted along with the ECH power, the ion temperature and the neutral density necessary for a steady state to be maintained in these machines.
D.E. Hastings, T. Kamimura
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Ion cyclotron electromagnetic wave structure in Elmo bumpy torus

Journal of Plasma Physics, 1985
The problem of ion cyclotron wave structure in EBT has been analyzed using the smallness of the inverse aspect ratio ε = a/R0 and of the inverse cavity number ε' = 1/N. The procedure is to expand in these two parameters, reducing the complete toroidal problem to a system of equations to be solved in sequence.
M. Cotsaftis, N. T. Gladd, N. A. Krall
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