Results 111 to 120 of about 540 (146)

Whistler instability in the Elmo Bumpy Torus

The Physics of Fluids, 1982
A governing equation for whistler modes in the Elmo Bumpy Torus is presented and solved perturbatively. To lowest order, a discrete spectrum of real frequencies is determined. Finite growth rates are found to first order. Attention is focused on trapped electron resonances.
Guzdar, P. N., Marchand, R.
openaire   +4 more sources

Resonant ion transport in the ELMO Bumpy Torus

The Physics of Fluids, 1983
Modeling the ELMO Bumpy Torus as a bumpy cylinder with toroidally induced vertical drift, neoclassical transport coefficients are obtained for resonant ions as integrals over the energy-dependent flux. A continuous approximation to this energy-dependent flux reduces to the correct results in the banana and plateau regimes and yields simple analytic ...
Hastings, D. E., Jaeger, E. F., Hedrick, C. L., Tolliver, J. S.   +3 more
openaire   +3 more sources

Neoclassical Transportation in the ELMO Bumpy Torus

Physical Review Letters, 1978
In the ELMO bumpy torus, neoclassical transport coefficients depend critically on the ambipolar electric field. These coefficients, calculated for arbitrary radial electric fields, are applied in a one-dimensional radial-transport calculation which, for the first time, treats the electric field self-consistently.
E. F. Jaeger, D. A. Spong, C. L. Hedrick
openaire   +3 more sources

Variational corrections to ELMO Bumpy Torus neoclassical ion plateau transport

The Physics of Fluids, 1980
Low collisionality corrections to ELMO Bumpy Torus (EBT) ion plateau transport coefficients are calculated using a variational method. Using a bounce-averaged drift kinetic equation and a drift orbit model appropriate to collisionless EBT ion transport, a solution is obtained that is accurate to first order in ε(Ω0/ν0)2/3 (ε is the inverse aspect ratio,
Spong, D. A., Hedrick, C. L.
openaire   +3 more sources

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   +3 more sources

Finite Larmor radius stability theory of ELMO Bumpy Torus plasmas

The Physics of Fluids, 1983
An eikonal ballooning mode formalism is developed to describe curvature-driven modes of hot electron plasmas in bumpy tori. The formalism treats frequencies comparable to the ion cyclotron frequency, as well as arbitrary finite Larmor radius and field polarization, although the detailed analysis is restricted to E∥ =0.
Berk, H. L., Cheng, C. Z., Rosenbluth, M. N., van Dam, J. W.   +3 more
openaire   +4 more sources

Space potential profiles in ELMO Bumpy Torus (EBT) experiment

The Physics of Fluids, 1983
Spatially resolved measurements of the electric space potential in the ELMO Bumpy Torus (EBT) have been made by a heavy ion beam probe. The EBT-I device is characterized by positive potentials in the surface plasma the order of 100 V and by a nearly symmetric potential well in the core plasma of up to 300 V with respect to the surface potential.
Frank M. Bieniosek, Kenneth A. Connor
openaire   +3 more sources

Effects of hot electrons on magnetohydrodynamic modes in ELMO Bumpy Torus

The Physics of Fluids, 1980
The effect of hot electrons on magnetohydrodynamic instabilities is studied using a fully electromagnetic, finite β, Vlasov–Maxwell model consisting of three species in an inhomogeneous slab geometry with gravity. If no hot electrons are present, the Vlasov model agrees with well-known results from the magneto-hydrodynamic model.
openaire   +3 more sources

Catastrophes in the ELMO Bumpy Torus

Physical Review Letters, 1982
The simple neoclassical nonresonant-point model of Hedrick et al. is slightly modified by leaving the ion transport unspecified (since it is now known to be resonant). Small continuous changes in the microwave power/neutral density can cause hysteresis and catastrophe jumps in the equilibria, in qualitative agreement with experiment.
George Vahala, Alkesh Punjabi, Edward G. Harris   +2 more
openaire   +1 more source

ELMO Bumpy Torus with Enhanced Confinement

Physical Review Letters, 1983
A toroidal array of racetrack-shaped coils whose major axes are alternately oriented vertically and horizontally ("Andreoletti coils") provides neoclassical confinement that is strikingly superior to a simple bumpy torus of similar aspect ratio but circular coils.
R. L. Miller, R. A. Dandl, G. E. Guest
openaire   +1 more source