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This situation can only be remedied by the construction of a new high-flux reactor and a state-of-the-art spallation source, which would allow a full complement of neutron instrumentation. However, if the construction of only a single source is possible, then the choice depends on the time-averaged flux which can be actually realized at each facility. If the reactor-tospallation-source flux falls within the guidelines of 50:1 or better, then a steady-state source is clearly optimum for most experiments, while if the ratio drops to 5:1 or smaller, then a spallation source would provide the best overall capabilities.

4 Existing Facilities There are serious problems with the availability of the DOE sources both currently and in the recent past, as well as the nature of the instrumentation and the accessibility of the current DOE facilities for neutron scattering research. S. scientists. Improvements need to be made to accommodate the neutron scattering community until new neutron sources can be brought on-line. 1 Availability of the Sources In recent years the BNL and ORNL reactors have been shut down for considerable periods, and the LANL facility has only operated for a few weeks each year.

R ................................. Ill/l..................................... 3-5 instruments at spallation sources are of course TOF machines, with detectors covering a wide angle range to increase the data rate. These instruments are well suited to spallation sources. For sources with a time-averaged-flux ratio between 50:1 and 5:1, similar quality of results can be obtained. At present the techniques are somewhat better developed at reactor sources, particularly for single-crystal structures and small-angle scattering.

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