The superconducting magnets of the Tokamak Ignition/Burn Experimental Reactor (TIBER II) will generate high magnetic fields over large bores. The resulting electromagnetic forces require the use of large volumes of distributed steel and thick magnet case for structural support. Here we review the design allowables, calculated loads and forces, and structural materials selection for TIBER II. 7 refs., 2 figs., 3 tabs.

Recent measurements by TASSO of the lifetimes of charmed mesons is reviewed. The lifetime reported for the D/sub s/ meson utilizes the entire data sample collected. The lifetime of the neutral charmed meson, D/sup o/, is from a subsample of the total data set. Special emphases is given to the experimental procedures used.

The Alcator-C machine to be installed in the MTX facility will be housed in a one-foot-thick shield wall at Lawrence Livermore National Laboratory (LLNL). This facility differs from the housing at the Massachusetts Institute of Technology (MIT) in that the expected radiation levels are estimated to be higher because the free electron laser (FEL) will heat the plasma. The shield walls that surround the experiment will have a large amount of rebar and metal structure that will be isolated to various degrees to maintain grounding isolation, minimize grounding loops, and minimize currents that could disrupt diagnostic abilities, cause personnel hazards, or affect plasma location. The walls are also designed to LLNL earthquake standards. Construction started in June and was completed by late July. Details of the design criteria for radiation, earthquake, and electrical isolation, along with the design, construction, and related issues will be presented in the paper. 4 refs., 8 figs.

Our recent work in the comparison of parametric models for use in animal radiation mortality studies is reviewed, along with predictions of lethal doses for man based on these models. 1 ref., 1 tab.

This report outlines the status of the Engineering Test Reactor (ETR) system codes by module and expected completion date. Preliminary ETR design space studies have also been completed and several sensitive design assumptions and constraints have been identified. A preliminary study of TF coil technology has also been performed for the TIBER/ETR Engineering phase and design contraints are listed. (FI)

The primary goal in designing inertial confinement fusion (ICF) reactors is to produce electrical power as inexpensively as possible, with minimum activation and without compromising safety. This paper discusses a method for designing the Cascade rotating ceramic-granule-blanket reactor (Pitts, 1985) and its associated power plant (Pitts and Maya, 1985). Although focus is on the cascade reactor, the design method and issues presented are applicable to most other ICF reactors.

Energetic hadronic and electromagnetic showers in the keV era of the hot big bang are produced by the decays of long lived particles. These showers initiate a new phase of nucleosynthesis. The abundance ratios of D, /sup 3/He, /sup 6/Li and /sup 7/Li are given by fixed points of rate equations, which are determined by nuclear physics not by the nature of the decaying particle. The fixed points are independent of prior abundances, so that constraints from the MeV era of nucleosynthesis evaporate, except for a requirement that /sup 4/He not be underproduced. For example, ..cap omega../sub B/ = 1 and many more than four neutrino species are both possible. Within the accuracy of our calculation (there are uncertainties of at least a factor of three), the abundances agree with those inferred from observations. Considerable /sup 6/Li is produced and must be depleted in both population II halo stars and in the galactic disk. We predict /sup 6/Li, /sup 3/He and D abundances in primordial material which are higher than conventional nucleosynthesis. 8 refs.

The cryogenic system for the Mirror Fusion Test Facility (MFTF) at Lawrence Livermore National Laboratory (LLNL) was designed to cool the entire MFTF-B system from ambient to operating temperature in less than 10 days. The system was successfully operated in the recent plant and capital equipment (PACE) acceptance tests, and results from these tests helped us correct problem areas and improve the system.