Results 81 to 90 of about 355 (107)

Lower hybrid heating in ELMO Bumpy Torus

Nuclear Fusion, 1983
Absorption of lower hybrid wave energy by the electron and ion plasma components in the ELMO Bumpy Torus (EBT) is examined. The wave and plasma parameters used are those appropriate for the EBT-Scale (EBT-S) and EBT Proof-of-Principle (EBT-P) devices. The computations are carried out using a ray-tracing code that was developed at the Oak Ridge National
R.C. Goldfinger, A.H. Kritz, D.B. Batchelor   +2 more
openaire   +2 more sources

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.
openaire   +2 more sources

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
openaire   +1 more source

Neoclassical transport in Elmo Bumpy Torus (EBT)

Nuclear Fusion, 1979
The calculation in this paper clarifies the ordering of transport regimes in Elmo Bumpy Torus (EBT), identified as one collisional and two collisionless regimes, plateau and banana. Explicit analytic estimates of the transport rates in the plateau regime are obtained.
R.D. Hazeltine, N.A. Krall, H.H. Klein, P.J. Catto   +3 more
openaire   +1 more source

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
openaire   +1 more source

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.
openaire   +1 more source

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 ...
openaire   +1 more source

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
openaire   +2 more sources

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 ...
openaire   +1 more source

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
openaire   +1 more source