WorldCat Identities

Princeton University Plasma Physics Laboratory

Overview
Works: 7,231 works in 9,073 publications in 1 language and 28,488 library holdings
Genres: Conference papers and proceedings  History 
Roles: Researcher, Editor
Classifications: QC718.5.H5, 621.484
Publication Timeline
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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 Applications of Radio-Frequency Power to Plasmas( Book )

3 editions published in 1987 in English and held by 206 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 80 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 62 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
General theory of kinetic ballooning modes by Princeton University( Book )

4 editions published in 1979 in English and held by 62 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
Cold electrostatic ion cyclotron waves and ion-ion hybrid resonances by M Ono( Book )

3 editions published in 1978 in English and held by 61 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
Enhanced transport in tokamaks due to toroidal ripple by A. H Boozer( Book )

4 editions published in 1980 in English and held by 61 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
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 60 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
Stochastic acceleration by hydromagnetic turbulence by R. M Kulsrud( Book )

3 editions published in 1979 in English and held by 60 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
Phased waveguide array with fixed tuning elements by Princeton University( Book )

3 editions published in 1980 in English and held by 60 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
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 60 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
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 60 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
Conditions for soft X-ray lasing action in a confined plasma column by S Suckewer( Book )

3 editions published in 1979 in English and held by 60 WorldCat member libraries worldwide

The idea of using a multi-Z (e.g., carbon, oxygen) thin plasma column as a medium for soft x-ray lasing action is presented. A plasma confined by a strong magnetic field is first heated by a CO₂-laser, and then cools rapidly by radiation losses. This leads to a level population inversion of hydrogen-like carbon or oxygen ions. Two computational models are presented. One uses given electron temperature, T/sub e/(t), evolutions. The other uses T/sub e/(t) calculated from an energy balance equation ith CO₂-laser beam power as a parameter. According to calculations, a total gain of G> 100 is expected for 3 .-->. 2 and G> 10 for 4 .-->. 2 transitions (lambda = 182 A and lambda = 135 A, respectively) for CVI ions using a CO₂-laser beam with power approx. 5 x 10¹° W for plasma column heating
Particle diffusion by magnetic perturbations of axisymmetric geometries by Harry E Mynick( Book )

3 editions published in 1979 in English and held by 60 WorldCat member libraries worldwide

The quasilinear theory of collisionless test particle diffusion in stochastic magnetic fields is extended to include the effects of finite gyroradius, particle drifts, and magnetic trapping. Runaway confinement is substantially improved relative to earlier estimates which assumed that particles exactly followed field lines. Trapped particles are not expected to be stochastic
An algorithm for locating the extremum of a multi-dimensional constrained function and its application to the PPPL hybrid study by C Bathke( Book )

4 editions published in 1978 in English and held by 60 WorldCat member libraries worldwide

A description is presented of a general algorithm for locating the extremum of a multi-dimensional constrained function. The algorithm employs a series of techniques dominated by random shrinkage, steepest descent, and adaptive creeping. A discussion follows of the algorithm's application to a ''real world'' problem, namely the optimization of the price of electricity, P/sub eh/, from a hybrid fusion-fission reactor. Upon the basis of comparisons with other optimization schemes of a survey nature, the algorithm is concluded to yield a good approximation to the location of a function's optimum
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 60 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
Unstable universal drift eigenmodes in toroidal plasmas by C. Z Cheng( Book )

4 editions published in 1979 in English and held by 60 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
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 60 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
Plasma heating by externally launched ion Bernstein waves by M Ono( Book )

3 editions published in 1979 in English and held by 60 WorldCat member libraries worldwide

Externally launched ion Bernstein waves are shown to provide highly effective means for heating reactor plasmas. In a high density plasma (n₀ greater than or equal to 10¹⁴cm⁻³), an ion Bernstein wave with a parallel index of refraction n/sub parallel/ = O (1) is mode-transformed into a high-density ion Bernstein wave with electron Landau damping several orders of magnitude smaller than that of the original ion Bernstein wave. Because of this reduced damping, an externally launched ion Bernstein wave with n/sub parallel/ less than or equal to 6 can penetrate to and deposit most of its wave power in the core of even a reactor-grade plasma (n₀= 3 x 10¹⁴cm⁻³, T/sub eo/ = T/sub io/ = 7 keV, B₀ = 60 kG)
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 59 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
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 59 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
 
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Alternative Names

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Plasma Physics Laboratory

PPPL

Princeton Plasma Physics Laboratory

Princeton Plasma Physics Laboratory onderzoeksinstituut in New Jersey, Verenigde Staten van Amerika

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)