Showing papers in "Fusion Engineering and Design in 1996"

TL;DR: The WARP3d A.Friedman simulation code as mentioned in this paper combines the particle-in-cell plasma simulation technique with a realistic description of the elements which make up an accelerator.

TL;DR: In this article, a thermal stress analysis system has been developed which enables the accurate analysis of multilayer composites such as functionally graded materials such as tungsten/copper materials.

TL;DR: In this article, two transport modes (pinched transport and channel transport) are investigated in the high chamber density regime, which involves focusing the beam outside the chamber then transporting it at small radius (approximately 2 mm).

TL;DR: In this paper, the transient electromagnetic analysis of conducting structures in tokamaks is presented based on a three-dimensional thin conducting shell model, and the finite element method has been used to solve the corresponding integrodifferential equation.

TL;DR: The idea of using liquid wall protection has been employed in a number of laser, light-ion, and heavy-ion designs, for example, BLASCON, HYLIFE-I, HIBALL, Libra-SP, Cascade, Osiris, HYLife-II and others as mentioned in this paper.

TL;DR: In this paper, the authors analyze the effect of r.f. sheaths in determining the antenna-plasma interaction and the sensitivity of the sheaths to the complicated three-dimensional structure of modern ion cyclotron range of frequency antennas.

TL;DR: In this article, the tritium distribution in the graphite tiles was measured by means of burning sample pieces, converting the Tritium into HTO and counting the resultant water.

TL;DR: In this paper, a simple equilibrium theory of a beam with a temporally pinching radial envelope predicts that large confining magnetic fields are possible with net currents of more than 50% of the beam current.

TL;DR: In this paper, a conceptual scheme is presented which combines self-consistently a hohlraum target design at the input energy E dr = 10 MJ with a scheme for a charge-symmetric heavy ion driver capable of producing the pulse power profile and the focal spot size required for target ignition and high energy gain.

TL;DR: In this paper, a small electron ring with a circumference of about 11 m was constructed at the University of Maryland for studying the evolution of a space-charge-dominated beam in a circular lattice and the general features of the lattice design with printed-circuit quadrupoles, dipoles, and other components and special problems were presented.

TL;DR: In this article, progress in the preparation of the 2 MV injector at LBNL as the front end of Elise and as a multipurpose experimental facility for heavy ion fusion beam dynamics studies is reported.

TL;DR: In this paper, the authors proposed an alternative scenario for a heavy ion driver for inertial confinement fusion, where a beam is stripped by passing it through a thin foil (or gas) which also supplies neutralizing electrons.

TL;DR: In this paper, the decay heat in the water cooled shielding blanket design of ITER (fusion power 1.5 GW) is about 20 MW at shutdown and decreases to 1 MW after one day after which it stays fairly constant (1 MW after a month).

TL;DR: In this article, a thorough numerical and experimental analysis of the post-CHF phenomenon under a one-sided heat load has been carried out, and the overall results show that safety margins in actively cooled plasma facing components can be increased when conditions for stable post CHF exist.

TL;DR: In this article, the theory of conventional segmented multipole magnets formed from uniformly magnetized block magnets placed in regular arrays about a circular magnet aperture is reviewed and a new class of elliptical aperture magnets is presented within a model with continuously varying magnetization angle.

TL;DR: Very accurate and reproducible focusing of ion beams (Ne, C, Ar, Au) at energies between 10 and 300 MeV a.m. was achieved in an experimental programme at GSI, using a wall-stabilized discharge as an active plasma lens.

TL;DR: In this paper, the US Heavy Ion Fusion Program in targets, target chambers and accelerators is described, and the importance of economics in fusion research in the United States is discussed.

TL;DR: In this article, the energy loss of heavy ions in strongly coupled plasmas was investigated by performing molecular dynamics (MD) computer simulations, where the authors considered the non-linear behavior for strong target-ion coupling parameters.

TL;DR: In this paper, the surface constants for the recombination and adsorption of tritium in Inconel 625 and austenitic stainless steel AISI 316 L were determined from the measurement of tritium permeation through engineering components (bellows).

TL;DR: In this paper, the first feedback control system for a reversed field pinch (RFP) machine was designed for RFX (Reverse Field eXperiment), the largest presently operating RFP device.

TL;DR: Elise is an electrostatically focused heavy-ion accelerator being designed and constructed at Lawrence Berkeley Laboratory as mentioned in this paper, which is intended to be the first half of the four-beam Induction Linac Systems Experiment (ILSE), which ultimately will test the principal beam dynamics issues and manipulations of induction heavy ion drivers for inertial fusion.

TL;DR: The IH LINAC cavity is able to generate 10 MV m−1 (average acceleration gradient) with focusing of the particles by a superconducting solenoid and quadrupole as mentioned in this paper.

TL;DR: In this article, a 2 1/2 D particle-in-cell (PIC) simulation code coupled with a Monte Carlo (MC) method for analyzing collisions is proposed to determine if a beam of heavy ions can be focused to the necessary spot-size radius of about 2 mm within an inertial confinement reactor chamber.

TL;DR: In this paper, computer simulations are employed to examine the transfer of transverse thermal energy to the longitudinal direction via a collective electrostatic instability which is driven by an initial temperature anisotropy.

TL;DR: The Small Recirculator as discussed by the authors accelerates a space charge-dominated beam of K{sup +} ions through 15 laps, from 80 to 320 keV and from 2 to 8 mA.

TL;DR: In this paper, a three-dimensional electromagnetic particle-in-cell PIC code was developed at Orsay, including new numerical features: new outgoing-wave boundary algorithm; modified set of Maxwell equations; propagation of the discrepancy to the Poisson equation; dynamic grid following the beam; calculation of the initial values of the electromagnetic fields without a priori boundary values.

TL;DR: In this article, a 5 mrad beam was created on the SABRE accelerator, by expanding the beam and passing the beam through a plate with pinholes, and the beamlets were created low divergence beamlets to study this mechanism.

TL;DR: In this article, a small prototype recirculator was designed to simulate the essential beam physics of a driver, and the authors showed how important physical quantities such as the sensitivity to errors of optical elements (in both field strength and placement), insertion/extraction, vacuum requirements, and emittance growth scale from small-prototype to driver-size accelerator.

TL;DR: A summary of experimental investigations of multicharged ions in the far expansion zone at about 2-3 m, generated from laser-produced plasmas, is presented in this paper.

TL;DR: In this article, the radially averaged axial component of the space charge field of an axisymmetric heavy ion beam in a cylindrical beam pipe is estimated, and the results compare well with exact solutions of Poisson's equation.