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Neutron flux measurement at RTNS facility

Description: Procedures and instrumentation for measuring neutron fluences and doses at the Lawrence Livermore Laboratory RTNS facility are described, primarily for information to outside users of this facility. The results of an intercomparison of the dosimeters are given, and the accuracy of the fluence determination is discussed.
Date: July 1, 1976
Creator: Barschall, H. H.; Booth, R. & Wong, C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Observations on the Response of a Lithium-Drifted Detector Protons

Description: The response of a lithium-drifted solid state detector was measured for protons and found to be linear up to the highest energy observed, 13.2 Mev. The resolution observed for these protons is 0.81% with a bias of 500 volts and 0.65% with a bias of 250 volts. (auth)
Date: April 18, 1961
Creator: Benveniste, J.; Booth, R. & Mitchell, A. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analyses and hydrogen-isotope-transport calculations of current and future designs of the LLL rotating-target neutron source

Description: Analyses of the present titanium-tritide RTNS targets are presented. These results include the hydrogen-isotope content of new and used targets, metallography, scanning electron microscopy, and hydrogen-isotope-diffusion calculations using a heat-flow finite-difference computer code. These latter calculations indicate that a combination of long target life and high neutron output is optimized when the rate of hydrogen isotope evolution from the target balances the deposition rate from the beam.… more
Date: September 1, 1975
Creator: Steward, S.A.; Nickerson, R. & Booth, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Characteristics of an ultrafast x-ray streak camera

Description: The detection and temporal dispersion of the x-rays using x-ray streak cameras has been limited to a resolution of 2 ps, primarily due to the transit time dispersion of the electrons between the photocathode and the acceleration grid. The transit time spread of the electrons traveling from the photocathode to the acceleration grid is inversely proportional to the accelerating field. By increasing the field by a factor of 7, we have minimized the effects of transit time dispersion in the photoca… more
Date: June 1, 1994
Creator: Shepherd, R.; Booth, R. & Price, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Rotating target neutron source II: progress report

Description: The RTNS-II Facility at Livermore was authorized in the FY76 ERDA budget. This facility will house two 4 x 10/sup 13/ n/s sources of 14-MeV neutrons for materials damage experimentation. RTNS-II will be the first of DCTR's dedicated neutron source facilities. Initial operation is currently scheduled for March 1978. Engineering design of buildings and neutron sources started in March 1976 with construction scheduled to begin in August 1976. Design of the 150 mA D/sup +/ accelerators is based upo… more
Date: September 1, 1976
Creator: Davis, J. C.; Osher, J. E.; Booth, R. & Logan, C. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Factors affecting calculations of dose resulting from a tritium release into the atmosphere

Description: Tritium releases in the form of HT represent a lower hazard to man than releases as HTO. However, during movement in the environment, HT is converted into HTO. The effects of the conversion rate on calcultions of dose are described, and a general method is presented for determining the dose from tritium for various conversion rates and relative HTO/HT risk factors.
Date: January 1, 1976
Creator: Otaduy, P.; Easterly, C. E.; Booth, R. S. & Jacobs, D. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Driving pockels cells using avalanche transistor pulsers

Description: The purpose of this paper is to describe the current state of avalanche transistor based Pockels cell driver development at LLNL and to provide the reader with a set of useful design guidelines. A general description of the units is followed by a short section on the circuit design of avalanche transistor pulsers. A more detailed design guide is given. Techniques for delivering either {1/4} or {1/2} wave voltages to a Pockels cell are covered. Recently these units have been modified for use at … more
Date: May 28, 1997
Creator: Fulkerson, E. S.; Norman, D. C. & Booth, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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LLNL review of the 1994 accelerator production of tritium (APT) concept

Description: LLNL was asked in September 1994 to review the accelerator production of tritium (APT) concept as it had evolved up to the fall of 1994. The purpose was not to compare it to other sources of tritium, but to identify possible technical flaws in the concept and to assess feasibility. The APT concept reviewed was based on a 1.0 GeV normal conducting proton linac operating CW at currents up to 200 mA with a target of tungsten and blanket of {sup 3}He and lead. The LLNL review group concurs with the… more
Date: March 8, 1995
Creator: Alesso, H.P.; Barnard, J.J. & Booth, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Observations on the Response of Two P-NJunction Diodes to Protons

Description: The response of a two silicon p-n junction diodes has been measured for protons up to 13.3 Mev. In one case the dependence of depletion layer thickness with bias voltage was found to be T or V(0.46). The observed resolution, made up of contributions from crystal noise, beam width, and scatterer thickness, was about 1% for 9-Mev protons.
Date: November 22, 1960
Creator: Benveniste, J.; Booth, R. & Mitchell, A. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Temporal Characterization of a Picosecond Laser-Pumped X-ray Laser (for Applications)

Description: Compact soft x-ray laser sources are now used routinely for various applications primarily because of their high repetition rate, high photon fluence and short pulse duration characteristics. For some of these applications, for example interferometry of high density laser-produced plasmas, longer optical drive pulses, 6-13 ps (FWHM), have been implemented to maximize the x-ray output and coherence. It is therefore important to know the x-ray laser pulse length, shape and repeatability for these… more
Date: November 25, 2003
Creator: Dunn, J; Nilsen, J; Shepherd, R; Shlyaptsev, V; Booth, R; Smith, R et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Pulse duration measurements of a picosecond laser-pumped 14.7 nm x-ray laser

Description: The temporal dependence of the 14.7 nm Ni-like Pd ion x-ray laser is measured as a function of the laser drive conditions with a fast sub-picosecond x-ray streak camera. The chirped pulse amplification laser beam that pumps the inversion process is varied from 0.5 - 27 ps (FWHM) to determine the effect on the x-ray laser pulse duration. The average x-ray laser pulse duration varies by a relatively small factor of 2.5 times from 3.6 ps to 8.1 ps with traveling wave (TW) irradiation conditions. S… more
Date: August 3, 2004
Creator: Dunn, J; Smith, R F; Shepherd, R; Booth, R; Nilsen, J; Hunter, J R et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Sub-picosecond streak camera measurements at LLNL: From IR to x-rays

Description: An ultra fast, sub-picosecond resolution streak camera has been recently developed at the LLNL. The camera is a versatile instrument with a wide operating wavelength range. The temporal resolution of up to 300 fs can be achieved, with routine operation at 500 fs. The streak camera has been operated in a wide wavelength range from IR to x-rays up to 2 keV. In this paper we briefly review the main design features that result in the unique properties of the streak camera and present its several sc… more
Date: December 21, 2003
Creator: Kuba, J; Shepherd, R; Booth, R; Steward, R; Lee, E W; Cross, R R et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Guidance for the design and management of a maintenance plan to assure safety and improve the predictability of a DOE nuclear irradiation facility. Final report

Description: A program is recommended for planning the maintenance of DOE nuclear facilities that will help safety and enhance availability throughout a facility`s life cycle. While investigating the requirements for maintenance activities, a major difference was identified between the strategy suitable for a conventional power reactor and one for a research reactor facility: the latter should provide a high degree of predicted availability (referred to hereafter as ``predictability``) to its users, whereas… more
Date: October 1, 1994
Creator: Booth, R. S.; Kryter, R. C.; Shepard, R. L.; Smith, O. L.; Upadhyaya, B. R. & Rowan, W. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A broadband high-resolution elliptical crystal x-ray spectrometer for high energy density physics experiments

Description: Spectroscopic investigation of high temperature laser produced plasmas in general, and x-ray opacity experiments in particular, often requires instruments with both a broad coverage of x-ray energies and high spectral, spatial, and temporal resolution. We analyze the design, model the response, and report the commissioning of a spectrometer using elliptical crystals in conjunction with a large format, gated microchannel plate detector. Measurements taken with this instrument at the JANUS laser … more
Date: March 31, 2006
Creator: Anderson, S G; Heeter, R F; Booth, R; Emig, J; Fulkerson, S; McCarville, T et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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CUMEX: a cumulative hazard index for assessing limiting exposures to environmental pollutants

Description: A hazard index methodology called CUMEX has been developed for limiting human exposure to environmental pollutants. Hazard index is defined as Q/Q/sub L/ where Q is exposure or dose to total-body, organ or tissue from all environmental pathways and Q/sub L/ is a limit which should not be exceeded because of health risk to humans. Mathematical formulations for hazard indices are developed for each sampling medium corresponding to each effluent type. These hazard indices are accumulated into comp… more
Date: April 1, 1977
Creator: Walsh, P. J.; Killough, G. G.; Parzyck, D. C.; Rohwer, P. S.; Rupp, e.M.; Whitfield, B. L. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Novel Compact Electron Spectrometer for Hot Electron Measurement in Pulsed Laser Solid Interaction

Description: Ultra-intense laser-matter interactions provide a unique source of temporally short, broad spectrum electrons, which may be utilized in many varied applications. One such, which we are pursuing, is as part of a novel diagnostic to trace magnetic field lines in a magnetically-confined fusion device. An essential aspect of this scheme is to have a detailed characterization of the electron angular and energy distribution. To this effect we designed and constructed a compact electron spectrometer t… more
Date: July 5, 2002
Creator: Chen, H.; Patel, P.; Price, D. F.; Young, B. K.; Springer, P. T.; Berry, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Improved Energy Coupling into the Gain Region of the Ni-Like Pd Transient Collisional X-Ray Laser

Description: We present within this paper a series of experiments, which yield new observations to further our understanding of the transient collisional x-ray laser medium. We use the recently developed technique of picosecond x-ray laser interferometry to probe the plasma conditions in which the x-ray laser is generated and propagates. This yields two dimensional electron density maps of the plasma taken at different times relative to the peak of the 600ps plasma-forming beam. In another experimental camp… more
Date: October 5, 2004
Creator: Smith, R.; Dunn, J.; Filevich, J.; Moon, S.; Nilsen, J.; Keenan, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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