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This is an informal report intended primarily for internal or limited external "_ distribution. The opinions and conclusions stated are those of the author and may or ma}' not be those of the laboratory. Work performed under the auspices of the U.S. Department of Fnergy by the Lawrence Livermore National Laboratory under Contract W-7405-Fng-48. DISCLAIMER This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. J This report has been reproduced directly from the best available copy.