[en] The design and engineering of a wetted wall cavity is in progress at UCLA as part of an Inertial Fusion Energy (IFE) reactor study led by McDonnell Douglas. In this paper, the authors outline the design methodology, analyze the thermal, mechanical, nuclear and energy conversion attributes of the cavity, and present possible solutions to outstanding problems

[en] Inertial Confinement Fusion (ICF) experiments require sophisticated diagnostics with temporal resolution measured in tens of picoseconds and spatial resolutions measured in microns. The Los Alamos ICF Program is currently supporting a number of diagnostics on the Nova and Trident laser facilities and is developing new diagnostics for use on the Omega laser facility. New systems and technologies are being developed for use on the National Ignition Facility, which is expected to be operational early in the next decade

[en] With the low-frequency phase aberration caused by optics simulated by random phase plate and quantified with RMS phase gradient, the propagation of the beam is simulated. Something new is found with the rule of low-frequency phase aberration superimposition, so that the formula for the rule is modified, which is the theoretical foundation of phase aberration correction; the relationship between the focal spot size and RMS phase gradients is evident after simulating some focusing process. As a result, a kind of new method of controlling the beam quality is obtained

[en] LHD is a fusion experimental device that equips the largest superconducting coil system. In order to produce good magnetic configuration, the supporting structures for coils are required to have high rigidity against large electromagnetic forces. Besides, their manufacturing errors should be controlled to realize high accurate assembling of the coils. The construction of LHD was completed in January of 1998. The mechanical design and the results of construction of the supporting structures are summarized. (author)

No abstract available

[en] A set of macroscopic linearized equations describing the motion of a plasma with anisotropic pressure, obtained from the double adiabatic model equations, is solved numerically as an initial boundary-value problem. The analysis was performed assuming small scale perturbations about a stationary equilibrium. The anisotropic pressure equilibrium about which the linearization is performed is obtained from an analytic expression for the vacuum magnetic fields which are corrected for finite pressure effects. The equilibrium is specified on a toroidal mesh in three dimensions so nested magnetic surfaces are not required, although magnetic surfaces, at least in an averaged sense, are assumed to exist. The stability analysis code solves the time and space dependent partial differential equations on the mesh specified for the equilibrium beginning with a small initial perturbation. The stability of the plasma in the experiments CLEO, Wendelstein VII-A and heliotron-E is studied as a function of beta and the ratio of parallel to perpendicular pressure γ. In those designs found to have a stability beta limit less than the equilibrium limit, it was observed that perpendicular pressure was favored over parallel pressure. That is, the beta limit was higher for γ < 1 and lower for γ > 1

[en] The authors discuss how they tested a low inductance, vacuum convolute for driving Z-pinch loads on Proto-II. The Proto-II vacuum section has four separate insulator stacks (1 m dia., 16 cm high) feeding four disk feeds. These disk feeds are coupled together by twelve, vertical magnetically-insulated transmission lines (MITLs) that are, in turn, convoluted into a single-disk MITL near the load. This convolute adds all of the inductance of the individual feeds in parallel, resulting in a total system inductance of 6.5 nH and short circuit currents as great as 9 MA. The vertical-to-disk convolute includes regions of poor magnetic insulation, which result in significant electron losses for the Z-pinch loads

No abstract available

[en] Target concepts for the National Ignition Facility (NIF) require progress in the art and science of target fabrication. Three distinct issues are addressed: beryllium fuel capsules, foam-buffered direct drive, and high-density gas-filled hohlraums. In all cases experiments on the existing Nova laser at LLNL are either in progress or planned for the near future to test the various concepts. Consequently, target fabrication must be able to deliver targets appropriate for each

[en] A continuing investigation is being made of the properties of high momentum, single particle orbits in an azimuthally symmetric ''mirror'' magnetic field. Results have been obtained in several areas. Calculations are given leading to a Hill's equation describing stable perturbations on midplane orbits in a field dominated as to shape by its quadratic terms. The results of some numerical tests are also presented, indicating that the equation may be of useful accuracy over an interesting range of parameters