WorldCat Identities

Princeton University Plasma Physics Laboratory

Overview
Works: 7,281 works in 9,111 publications in 1 language and 28,966 library holdings
Genres: Conference papers and proceedings 
Roles: Researcher, Editor
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Most widely held works about Princeton University
 
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Most widely held works by Princeton University
Applications of radio-frequency power to plasmas : seventh topical conference, Kissimmee, FL, 1987 by APS Topical Conference on Radio-frequency Power in Plasmas( Book )

3 editions published in 1987 in English and held by 227 WorldCat member libraries worldwide

Proceedings of the Workshop on New Diagnostics Related to Impurity Release, Germantown, Maryland, May 31 - June 1, 1979 by Workshop on New Diagnostics Related to Impurity Release( Book )

2 editions published in 1979 in English and held by 82 WorldCat member libraries worldwide

Techniques for measuring the alpha-particle distribution in magnetically confined plasmas by Princeton University( Book )

4 editions published in 1979 in English and held by 68 WorldCat member libraries worldwide

Methods are proposed for measuring the alpha-particle distribution in magnetically confined fusion plasmas using neutral-atom doping beams, ultraviolet spectroscopy, and neutral particle detectors. In the first method single charge exchange reactions, A° + He/sup + +/ -> A (He)*, are used to populate the n=2 and n=3 levels of He⁺. The ultraviolet photons from the decaying excited states are Doppler shifted by 5 to 10 Angstroms from those produced by the thermalized alpha-particle ash. In the second method double charge exchange reactions, A° + He/sup + +/ -> A/sup + +/ + He°, enable fast neutralized alpha-particles to escape from the plasma and be detected by neutral particle analysers. Detector configurations are analyzed, count rates are estimated and their detectability is discussed. A preliminary analysis of the feasibility of the required neutral beams is presented, and exploratory experiments on existing devices are suggested
Fast wave heating of two-ion plasmas in the Princeton large torus through minority cyclotron resonance damping by Princeton University( Book )

4 editions published in 1979 in English and held by 68 WorldCat member libraries worldwide

Strong minority proton heating is produced in PLT through ion cyclotron resonance damping of fast waves at moderate rf power levels. In addition to demonstrating good proton confinement, the proton energy distribution is consistent with Fokker--Planck theory which provides the prescription for extrapolation of this heating regime to higher rf power levels
General theory of kinetic ballooning modes by Princeton University( Book )

4 editions published in 1979 in English and held by 68 WorldCat member libraries worldwide

The ballooning mode formalism, previously developed for the ideal MHD problem, is applied here to the kinetic problem in tokamaks. The general two-dimensional equation governing drift and trapped-electron eigenmodes reduces to a one-dimensional integral equation along the lines of force with the radial structure determined by a WKB procedure. Comparisons made between the present one-dimensional code and a previous two-dimensional code embodying identical physical assumptions indicate reasonable agreement. This correspondence holds both for the structure along the field line and for the radial structure in the special case of closely spaced turning points
Enhanced transport in tokamaks due to toroidal ripple by A. H Boozer( Book )

4 editions published in 1980 in English and held by 67 WorldCat member libraries worldwide

A method for evaluating transport in non-symmetric systems is developed and applied to a previously unstudied ripple collisionality regime of tokamaks. This collisionality regime, the ripple plateau, is the regime of primary importance both for present day and reactor scale tokamaks. The results can be directly applied to related systems like the toroidal Z pinch
Regimes of operation in the Prineton Large Torus : by J.C. Hosea, Plasma Physics Laboratory, Princeton University by J Hosea( Book )

4 editions published in 1979 in English and held by 66 WorldCat member libraries worldwide

In the quest for optimum discharge conditions in the Princeton Large Torus (PLT), a variety of discharge regimes have been produced. These separate broadly into two main categories - those regimes with m greater than or equal to 2 oscillatory MHD instabilities and often hollow electron profiles for tungsten limiters, and those regimes for which the electron temperature is sufficiently peaked to support the internal sawtooth or near-sawtooth (m = 1) instability. The internal sawtooth regime is found to be optimum for confinement but to be more difficult to select when low-Z impurity concentrations have been reduced with low power discharge cleaning or gettering to permit extension of the high density operation limit. Gas programming is used to cool the plasma periphery, thereby reducing the high-Z impurity concentrations and causing the current channel to constrict into the sawtooth regime, and then to attain the desired plasma density. With discharges selected in this manner, gross energetic confinement times up to approx. 100 msec have been obtained at densities of approx. 10¹⁴ cm⁻³, and very high ion and electron temperatures have been produced with neutral beam injection heating at lower densities with no observable deleterious effect on energy confinement
Phased waveguide array with fixed tuning elements by Princeton University( Book )

3 editions published in 1980 in English and held by 65 WorldCat member libraries worldwide

The waveguide grill excites both penetrating lower hybrid waves and surface plasma waves. Quarter wavelength tuning elements attached to the sides of a twin waveguide are shown to reduce the surface wave component by a factor of approx. 3
Observations of giant recombination edges on PLT tokamak induced by particle transport by Princeton University( Book )

3 editions published in 1980 in English and held by 65 WorldCat member libraries worldwide

Characteristic steps in the continum spectrum of high temperature tokamak plasmas associated with recombination radiation from impurity ions were observed. During special argon-seeded discharges on the Princeton Large Torus (PLT) tokamak the x-ray spectrum exhibited large enhancements over the bremsstrahlung continuum beginning with energies of 4.1 keV. This corresponds to the radiative capture of free electrons by hydrogen-like argon into the ground state of helium-like argon. A simple particle diffusion model is proposed, with the Ar XVIII radial profiles evaluated from the size of the recombination edges. For the case of moderate density (<n/sub e/> approx. 3 x 10¹³ cm⁻³) and temperature (T/sub e/(0) approx. 1.5 keV) discharges the outward radial transport velocity is found to be approximately 10 m/sec
Cold electrostatic ion cyclotron waves and ion-ion hybrid resonances by M Ono( Book )

3 editions published in 1978 in English and held by 65 WorldCat member libraries worldwide

By utilizing a singly phased external ring structure, the existence of the cold low frequency resonance cone is verified for .omega. <.cap omega./sub i/ and .omega./k/sub parallel parallel/> V/sub Te/. Then with a slow wave structure, the dispersion relations of the cold electrostatic ion cyclotron waves are measured in both single and two-ion-species plasmas. In a two-ion-species plasma, a resonance near the ion-ion hybrid frequency is observed
Calculation of the Kolmogorov entropy for motion along a stochastic magnetic field by A. B Rechester( Book )

3 editions published in 1979 in English and held by 65 WorldCat member libraries worldwide

An expression for the Kolmogorov entropy has been derived. Excellent agreement between a probability description and direct dynamical computations has been found
Computational studies of impurity effects, impurity control, and neutral beam injection in large tokamaks by Princeton University( Book )

3 editions published in 1978 in English and held by 65 WorldCat member libraries worldwide

Computational models have been constructed for the Princeton Large Torus (PLT), the Poloidal Divertor Experiment (PDX), and the Tokamak Fusion Test Reactor (TFTR). These models have been calibrated by comparison with current experiments and used to predict plasma parameters and delineate favorable modes of operation for future experiments. The models for PLT emphasize plasma transport and neutral beam injection heating. The models for PDX emphasize the capability of divertors for impurity and recycling control in intense neutral-beam-heated tokamaks, as well as optimization of the MHD properties of divertor-equipped tokamaks. The TFTR calculations stress the fusion aspects of a large, circular cross-section D-T tokamak with intense neutral beam injection
Suppression of lower hybrid wave coupling due to the ponderomotive force by James Randall Wilson( Book )

3 editions published in 1980 in English and held by 65 WorldCat member libraries worldwide

The coupling efficiency from a slow-wave structure to lower hybrid waves is investigated experimentally. At moderate electric field strengths large edge density changes are observed. Wave trajectory modifications and departure from linear coupling are observed consistent with these changes and in good agreement with a simple nonlinear theory that includes the ponderomotive force
Stochastic acceleration by hydromagnetic turbulence by R. M Kulsrud( Book )

3 editions published in 1979 in English and held by 64 WorldCat member libraries worldwide

A general theory for particle acceleration by weak hydromagnetic turbulence with a given spectrum of waves is described. Various limiting cases, corresponding to Fermi acceleration and magnetic pumping, are discussed and two numerical examples illustrating them are given. An attempt is made to show that the expression for the rate of Fermi acceleration is valid for finite amplitudes
Strong plasma acceleration by slow shocks resulting from magnetic reconnection by Tetsuya Satō( Book )

3 editions published in 1979 in English and held by 64 WorldCat member libraries worldwide

An externally-driven magnetic reconnection is simulated for two two-dimensional magnetohydrodynamic models with anomalous resistivity: a closed boundary model where an O-type neutral point is formed between two X-type neutral points; and an open-ended model where only an X-type neutral point is formed. Computer runs have shown that: (1) X-shaped (Petschek type) slow shocks are formed. (2) In the closed boundary case, the plasma entering into the magnetic island through the X-type neutral points are moderately accelerated along the magnetic island boundaries. (3) In the open-ended case, the plasma acceleration is intensified and strong jet streams are generated on the downstream side of the slow shocks, with the speed approaching the Alfven speed of the upstream region
Observations of several disruptions in PLT using soft and ultra-soft x-ray radiation by Princeton University( Book )

3 editions published in 1979 in English and held by 64 WorldCat member libraries worldwide

The evolution of ultra-soft x-ray radiation (USX, h.nu. approx.> 100 eV) is compared to that of the soft x-ray radiation (SX, h.nu. approx.> 1000 eV) during several disruptions in PLT. Spatial resolution is obtained in both cases by arrays of silicon surface barrier detectors viewing along different chords. During some disruptions the USX behaves quite differently from the SX, and a classification is made based on the USX behavior. Different interpretations of the data are discussed, along with the possibility that these measurements may distinguish between the roles of temperature and impurity density changes during disruptions
Numerical studies of current generation by radio-frequency traveling waves by C. F. F Karney( Book )

3 editions published in 1979 in English and held by 64 WorldCat member libraries worldwide

By injecting radio-frequency traveling waves into a tokamak, continuous toroidal electron currents may be generated. This process is studied by numerically solving the two-dimensional Fokker-Planck equation with an added quasilinear term. The results are compared with the one-dimensional analytic treatment of Fisch, which predicted a reduced plasma resistivity when high-phase-velocity waves are employed. It is shown here that two-dimensional velocity space effects, while retaining the predicted scaling, further reduce the ratio of power dissipated to current generated by about 40%. These effects enhance the attractiveness of steady-state tokamak reactors utilizing this method of current generation
Unstable universal drift eigenmodes in toroidal plasmas by C. Z Cheng( )

3 editions published in 1979 in English and held by 64 WorldCat member libraries worldwide

The eigenmode equation describing ballooning collisionless drift instabilities is analyzed both analytically and numerically. A new branch of eigenmodes, which corresponds to quasi-bound states due to the finite toroidicity, is shown to be destabilized by electron Landau damping for typical Tokamak parameters. This branch cannot be understood by the strong coupling approximation. However, the slab-like (Pearlstein-Berk type) branch is found to remain stable and experience enhanced shear damping due to finite toroidicity
Non-linear converging resonance cones by J. R Wilson( Book )

3 editions published in 1979 in English and held by 64 WorldCat member libraries worldwide

The trajectory modification of a focused resonance cone due to ponderomotive force effects was investigated in the Princeton L-3 device. A single ring pulsed at f₀ approx. 50 MHZ (f/sub 1h/ much less than f₀ much less than f/sub pe/, f/sub ce/) launches a converging resonance cone in an argon plasma with n/sub e/ approx. 10⁹ to 10¹°, B approx. 400G to 1kG, T/sub e/ approx. 1 to 3 eV. At high driving power the strong localized electric fields modify the density through the ponderomotive force on the electrons, leading to a modification of the resonance cone trajectory. The cone is seen to bend in towards the axis and the focus moves toward the ring in agreement with the recent theory of Wang and Kuehl. The density perturbation at the focus propagates away and excites ion-acoustic waves. The wave dispersion relation was verified in He, Ne, Ar⁺, and Kr⁺ plasmas. Electron heating was observed which is consistent with collisional heating
Effect of convective loss on the parametric decay of cold electron plasma waves by Ka Leung Wong( Book )

3 editions published in 1979 in English and held by 64 WorldCat member libraries worldwide

The resonant decay of cold electron plasma waves was investigated in the Princeton L-3 device in an argon plasma with n approx. 10¹°⁻⁻¹°sup 11/ cm⁻³, B approx. 700 G -2kG, f₀ approx. 50 to 80 MHz (omega₀ greater than or equal to 10 omega/sub LH/). The decay waves were identified to be ion-acoustic waves and cold electron plasma waves. Because of convective losses in the finite extent pump field, the threshold for parametric decay is considerably higher than the collisional threshold for the dominant anti E/sub 0 perpendicular/ x anti B coupling. Coupling due to E/sub 0''/ can be important in low density high magentic field plasmas. At high densities (n> 3 x 10¹°cm⁻³), anti E/sub 0 perpendicular/ x anti B coupling becomes dominant. The anti E/sub 0 perpendicular/ x anti B decay convective threshold was measured at various antenna lengths; magentic field strengths and plasma densities
 
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Alternative Names

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Plasma Physics Laboratory

PPPL

Princeton Plasma Physics Laboratory

Princeton University Plasma Physics Laboratory

آزمایشگاه فیزیک پلاسما پرینستون

প্রিন্সটন পাজমা ফিজিক্স ল্যাবরেটরী

プリンストンプラズマ物理研究所

普林斯頓等離子體物理實驗室

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English (104)