Results 71 to 80 of about 355 (107)

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
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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.
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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
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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
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A numerical analysis of flute modes in the ELMO Bumpy Torus

The Physics of Fluids, 1983
Allowing for realistic magnetic field and plasma density profiles, a radial eigenvalue computer code was used to investigate flute modes in the ELMO Bumpy Torus (EBT).
El Nadi, A. M., Whitson, J. C.
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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.
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Catastrophes In The Elmo Bumpy Torus [PDF]

, 1983
Experimentally it is observed that the plasma in Elmo Bumpy Torus (EBT) shows discontinuous changes in the electron line density, electron and ion temperatures and fluctuation levels as the ambient gas pressure or electron cyclotron heating is varied ...
Punjabi, Alkesh R.
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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
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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
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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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