Due to the continuing high air sample results over the past six months, a thorough review of conditions and procedures was felt necessary for 325-B facility. A complete survey of the facility was made, looking for possible or definite problems. A discussion about procedures and conditions was held with all Radiation Monitoring personnel involved with the facility. The following items we felt needed attention to improve the working environment for the personnel in the facility. 1. Recommend glovebox be decontaminated and gloves changed to reduce dose rates. 2. Repair fume hood for proper airflow. 3. Move slurp jug inside fume hood and provide lead shielding. 4. Change storage of samples outside of cells to reduce dose rates. 5. Recommend contaminated waste from cells be bagged when removed through transfer tray. 6. Recommend fume hoods be installed at cell transfer trays. During a recent house cleaning, personnel in 325-B took action to correct items number 1 through 5, which leaves item number 6 to be considered. The need for fume hoods is based on high air sample results. These fume hoods would be very helpful in the unpackaging of contaminated samples. The removal of samples from the cell requires good air …

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This report summarizes the advances in the methods for neutronic and radiation design of NERVA.

This report addresses the ANSC Program Position Regarding Component Design vs Materials Plan Priorities

In accord with recent custom, the organizing committee for this conference has scheduled this review paper on beam instabilities. In view of the various review papers which already exist and the fact that the fundamentals of the subject have even been treated in a textbook, I thought this paper might best be devoted to a limited part of the rather large field of beam instabilities. Thus, I have selected only an aspect of the general subject, but an aspect which has during the last years been very much at the center of activity, and will--if my judgment is correct--be even more so in the years to come. I wish to concentrate, here, on the interaction of a relativistic particle beam with itself which is a result of the coupling of the beam with its surroundings. Before approaching this topic, a few remarks on the existing review papers are in order. A comprehensive treatment of beam instabilities may be found in Ref. 1, where, also, the reader will find some 48 references to the original literature. In Refs. 2 and 3, the General subject is approached from other points of view. Reference 4 is concerned with some special topics, but treats …

A trade study performance evaluation of five cool-down and two thrust nulling systems was made on the NERVA NSS hot bleed cycle during the time period of March to November, 1969. Three of the five cool-down systems were tank pressure fed.

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The effects of SCB coating, thermal shock and hermal scak on the dimensional stability of four heavy walled Incolcy 800 cladding tubes, ranging in thickness from 20 to 44 mils, was investigated. The results of the study were summarized in TI-759-240-029. This report serves as a repository for the detailed data and profilometer traces used in the preparation of that summary.

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We are interested in exposing Ilford G-5 pellicles to proton beam from the lowest to the highest energy value available. The exposures shall be along the plane of the pellicles with a flux density of 10{sup 4} to 10{sup 5} particles/cm{sup 2}. We shall study the primary interactions, the multiplicity and the cross-section as a function of primary energy which will vary from 200-500 GeV.

An experiment is proposed to expose nuclear emulsions loaded with B{sup 10} and LiF to high energy protons at 100 GeV, 150 GeV and 200 GeV. The purposes are: (i) to measure the total cross-sections at these incident energies, (ii) to investigate charged multiplicity as a function of energy, (iii) to investigate the angular distribution and development of hadron showers in collisions of protons with nuclei.

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A FORTRAN IV Monte Carlo program to calculate the neutron detection efficiency of plastic scintillators of rectangular or cylindrical geometry as a function of neutron energy and light collection threshold has been written and tested. The existing cross-section data for neutron-carbon interactions have been adjusted to give a good fit to existing measurements of efficiency. This document contains a complete description of the physics input and method of approach, together with detailed instructions for use of the program. A listing of the source code, the data deck, and output of a sample calculation are appended.

We propose to use the 1.75 mr neutral beam in the Meson Lab to study the reaction n + A {yields} N* + A (p + {pi}{sup -}) for targets with as large a range in atomic weight as possible (e.g. hydrogen through lead) and incident neutron energies from approximately 80 to 200 GeV. The aim is to study (1) the cross section vs. energy and mass for (p{pi}{sup -}) masses from 1.08 to approximately 4.7 GeV, (2) the A dependence of the cross section from which information on N* total cross sections in nuclear matter can be extracted, (3) the t-dependence which, for the lighter elements, gives information on quantum numbers of the N* and the exchanged particle can be extracted. This experiment would be a natural extension of a similar experiment carried out by our group at the AGS last summer. The experience gained in the AGS experiment will be very valuable in designing an experiment for NAL.

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