A 3-lane by 3500-linear ft portion of an urban highway was constructed of porous pavement. This design resulted from a research study of the use of porous pavement to provide highway drainage. It was determined that after two years of observation, the porous pavement is working as designed. Although the rainfall during the year was slightly less than the typical annual rainfall, there were no storms approaching the ten-year design storms to obtain a full test of the capacity of the system. Pavement deformation as measured in wheel tracks from a straight edge and from pavement elevations measured at the completion of construction are not severe or abnormal. Slight deformation in control sections of conventional pavement occurred immediately after opening to traffic and have undergone no significant change since then. Deformation in the experimental porous pavement is slightly more and occurred over a somewhat longer period than for the control sections. Measurements indicate an increase in moisture content of the subgrade at one location in the porous pavement, but little or no change at the other locations monitored. The increase occurred during the first four or five months after the pavement was put into service. The condition of both the control and experimental pavements are excellent at this time.

Key scientific results from recent experiments, modeling tools, and heavy ion accelerator research are summarized that explore ways to investigate the properties of high energy density matter in heavy-ion-driven targets, in particular, strongly-coupled plasmas at 0.01 to 0.1 times solid density for studies of warm dense matter, which is a frontier area in high energy density physics. Pursuit of these near-term objectives has resulted in many innovations that will ultimately benefit heavy ion inertial fusion energy. These include: neutralized ion beam compression and focusing, which hold the promise of greatly improving the stage between the accelerator and the target chamber in a fusion power plant; and the Pulse Line Ion Accelerator (PLIA), which may lead to compact, low-cost modular linac drivers.

The conceptual design of an ICF tritium production reactor is described. The chamber design uses a beryllium multiplier and a liquid lithium breeder to achieve a tritium breeding ratio of 2.08. The annual net tritium production of this 532 MW/sub t/ plant is 16.9 kg, and the estimated cost of tritium is $8100/g.

During the past two years, significant experimental and theoretical progress has been made in the US heavy ion fusion science program in longitudinal beam compression, ion-beam-driven warm dense matter, beam acceleration, high brightness beam transport; and advanced theory and numerical simulations. Innovations in longitudinal compression of intense ion beams by> 50 X propagating through background plasma enable initial beam target experiments in warm dense matter to begin within the next two years. They are assessing how these new techniques might apply to heavy ion fusion drivers for inertial fusion energy.