Office of Scientific & Technical Information Technical Reports - 13 Matching Results

Search Results

Results: 1 - 13
open access

Computational method for realistic estimates of the dose to active marrow

Description: Calculation of absorbed dose to active marrow from photon radiation is a complex problem because electronic equilibrium may not exist in the vicinity of soft tissue-bone mineral interfaces. Snyder et al. recognized the intractable geometry of trabecular bone in their studies of photon transport in the body and formulated marrow dose estimates in a conservative manner. Other investigators have noted that this approach leads to overestimate by factors of 3 or more at low photon energy. In this pa… more
Date: May 11, 1984
Creator: Eckerman, K.F. & Cristy, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Fiber optic sensor applications in field testing

Description: Fiber optic sensors (F.O.S.) are defined, and the application of this technology to measuring various phenomonon in diverse and hostile environments are discussed. F.O.S. advantages and disavantages both technically and operationally are summarized. Three sensor techniques - intensity, interferometric, and polarization - are then discussed in some detail. General environmental instrumentation and controls that support the Nuclear Weapons Test Program at the Nevada Test Site are discussed next t… more
Date: April 11, 1984
Creator: Perea, J. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Flow and plasticity via nonequilibrium molecular dynamics

Description: The viscous flow of fluids and the plastic flow of solids, such as metals, are interesting from both the practical and the theoretical points of view. Atomistic molecular dynamics simulations provide a way of visualizing and understanding these flows in a detailed microscopic way. Simulations are necessarily carried out at relatively high rates of strain. For this reason they are ideally suited to the study of nonlinear flow phenomena: normal stresses induced by shear deformation, stress rotati… more
Date: June 11, 1984
Creator: Hoover, W. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Impact assessment of additional safeguards and security controls on selected nuclides

Description: Battelle, Pacific Northwest Laboratory (PNL) has reviewed the current and projected inventory quantities of the selected nuclides in the reference letter and completed a quick assessment of the impacts of the additional safeguards and security controls. The areas that will be impacted are; physical protection, measurement systems, manual revisions, computer systems, and training.
Date: October 11, 1984
Creator: Simpson, C.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Metal finishing and vacuum processes groups, Materials Fabrication Division progress report, March-May 1984

Description: Progress is reported in fabrication and coating activities being conducted for the weapons program, nuclear test program, nuclear design program, magnetic fusion program, and miscellaneous applications. (DLC)
Date: July 11, 1984
Creator: Dini, J. W.; Romo, J. G. & Jones, L. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Modification of the code BEAMCORR, and some simulation results of the magnet and achromat misalignments for the SLC South Arc

Description: An important decision has been made regarding the correction scheme for the arcs leading to the adoption of the so called scheme I. In this scheme the beam position data are collected from single-plane x and y Beam Position Monitors (BPMs), which are placed in the drift spaces adjacent to the downstream D- and F-magnets correspondingly. Similarly, single-plane x and y correctors are used for moving the upstream end of the corresponding magnets. In the present simulation this scheme is used excl… more
Date: July 11, 1984
Creator: Shoaee, H. & Kheifets, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Multipurpose 5-MeV linear induction accelerator

Description: Although linear induction accelerators (LIAs) are quite reliable by most standards, they are limited in repeating rate, average power, and reliability because the final stage of energy delivery is based on spark gap performance. In addition, they have a low duty factor of operation. To provide a higher burst rate and greater reliability, the researchers used new technology to develop a magnetic pulse compression scheme that eliminates all spark gaps and exceeds requirements. The paper describes… more
Date: June 11, 1984
Creator: Birx, D.L.; Hawkins, S.A.; Poor, S.E. & Reginato, L.L. Smith, M.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Preliminary experiments with a carbon fiber tuft cathode

Description: This work reports initial tests of a carbon brush or tuft cathode intended for use by the Beam Research Program. It was found that electric fields of approximately 100 kV/cm were required to produce current densities above 20 A/sq cm. The beam extracted from the cathode consisted of many beamlets - one for each tuft. The beamlets were found to be quite uniform in peak current density and the cathode operation was microscopically repeatable. The turn-on time was estimated to be 200 ns.
Date: January 11, 1984
Creator: Fessenden, T.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Remote manipulator experience in target train maintenance at Fermilab

Description: When Fermilab was designed in the late 1960's and early 1970's, it was anticipated that Neutrino target train servicing could be costly in terms of personnel radiation exposure. This was based in part on the expectation that target intensities of at least 1E13 protons/pulse would be required to produce several neutrino interactions in a large bubble chamber detector. This was indeed later proven to be the case and historically the Neutrino beamline has been targeted with about one half of the p… more
Date: October 11, 1984
Creator: Butala, S. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Sound velocity of carbon at high pressures

Description: We have measured the sound velocity in shock compressed graphite. The data are consistent with a model of solid diamond from 0.8 to 1.4 Mbar. 18 references.
Date: September 11, 1984
Creator: Shaner, J. W.; Brown, J. M.; Swenson, C. A. & McQueen, R. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Use of magnetic compression based on amorphous alloys as a drive for induction linacs

Description: In anticipation of current and future needs for the Particle Beam Program and other programs at the Lawrence Livermore National Laboratory, we are continuing efforts in the development of high-repetition-rate magnetic pulse compressors that use ferromagnetic metallic glasses, both in the linear and very high saturation rates. These devices are ideally suited as drivers for linear induction accelerators, where duty factor or average repetition rates (hundred of hertz) requirements exceed the par… more
Date: June 11, 1984
Creator: Birx, D. L.; Cook, E. G.; Hawkins, S. A.; Poor, S. E.; Reginato, L. L.; Schmidt, J. A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Utility Monitoring for the Antiproton Source

Description: The purpose of the utility portion of the FIRUS system is to alert humans in the main control room, at Phillips farm, and in building 10 control room when either environmental conditions are unhealthy for antiproton source devices, or electrical or mechanical equipment is malfunctioning. When first envisioned, the FIRUS system consisted of the following equipment: (1) 2 FIRUS mini-computers (wall mounted, 1 fire, 1 utility); (2) emergency power supply (also wall mounted); (3) coax hardline comm… more
Date: June 11, 1984
Creator: McConnell, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen