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in subjects: "440101 -- Radiation Instrumentation-- General Detectors Or Monitors & Radiometric Instruments"

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K-edge densitometer (KED)

In 1979, a K-edge densitometer (KED) was installed by the Safeguards Assay group from Los Alamos National Laboratory in the PNC reprocessing plant at Tokai-mura, Japan. It uses an active nondestructive assay technique, KED, to measure the plutonium concentration of the product solution. The measurement uncertainty of an assay depends on the count time chosen, but can be 0.5% or better. The computer hardware and software were upgraded in 1992. This manual describes the operation of the instrumen… more

Date: February 11, 1993

Creator: Sprinkle, J. K. & Hansen, W. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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ATF beamline 1 analysis spectrometer

We describe the design parameters and expected performance of the analysis spectrometer for beamline 1 at the BNL Accelerator Test Facility. The spectrometer should be well suited for measuring the change in energy caused by the first generation laser acceleration experiments.

Date: January 1, 1993

Creator: Fernow, R.C.; Kirk, H.G. & Ulc, S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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A flat-cathode thermionic injector for the PHERMEX Radiographic Facility

The PHERMEX (Pulsed High-Energy Radiographic Machine Emitting X-rays) standing-wave linear accelerator is a high-current electron beam generator used for flash-radiography. An improved electron gun has been designed employing a flat-thermionic cathode to replace the existing Pierce-geometry gun. The flat cathode yields increased current with the same applied voltage and cathode area as the Pierce gun. The ISIS code simulations indicate a beam current of 1.5 kA at 600 kV. The new geometry also r… more

Date: January 1, 1993

Creator: Kauppila, T.; Builta, L.; Burns, M.; Gregory, W.; Honaberger, D.; Watson, S. (Los Alamos National Lab., NM (United States)) et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Development of a scintillating fiber tracker for the SSC

The Fiber Tracking Group (FTG) of the Solenoidal Detector Collaboration (SDC) is developing a high rate tracking subsystem appropriate for the SDC detector based on scintillating fiber (SciFi) technology. In the past two years a major upgrade in the design was conceived, which reduces the material and cost of the tracker and improves the effectiveness of the tracking system as a trigger element. The results of simulations of the performance of the tracker at Penn State have been very important … more

Date: October 1, 1992

Creator: Lewis, R.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The study of the phase structure of hadronic matter by searching for the deconfined quark-gluon phase transition using 2 TeV [bar p]p collisions; and by searching for critical phenomena in an exclusive study of multifragmentation using 1 GeV/nucleon heavy ion collisions. [Detect ionization of charged particles directly in Si]

An experiment to search for the production of quark[endash]gluon plasma in proton[endash]antiproton interactions is described with emphasis on 1992 results. Next, a search for critical phenomena using the EOS Time Projection Chamber is similarly described, including the results of 1992 test runs, nucleus[endash]nucleus collision simulations, and the extraction of critical indices from small percolation lattices. Analysis of results from experiments to detect the possible production of anomalous… more

Date: September 15, 1992

Creator: Scharenberg, R. P.; Hirsch, A. S. & Tincknell, M. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Design studies on the RHIC position monitor system

The Relativistic Heavy Ion Collider (RHIC) under construction at Brookhaven National Laboratory will consist of two superconducting storage rings 3.8 km in circumference sharing one tunnel in a side by side configuration. After injection from the existing AGS, the collider will accelerate and store a range of ion species extending from protons through gold to energies of 250 GeV for protons and 100 GeV/nucleon for fully stripped gold ions. Storage times should exceed 10 hours. As in most modem … more

Date: September 1, 1992

Creator: Shea, T.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Neutrons scattering studies in the actinide region

During the report period were investigated the following areas: prompt fission neutron energy spectra measurements; neutron elastic and inelastic scattering from [sup 239]Pu; neutron scattering in [sup 181]Ta and [sup 197]Au; response of a [sup 235]U fission chamber near reaction thresholds; two-parameter data acquisition system; black'' neutron detector; investigation of neutron-induced defects in silicon dioxide; and multiple scattering corrections. Four Ph.D. dissertations and one M.S. thesi… more

Date: September 1, 1992

Creator: Kegel, G.H.R. & Egan, J.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Amorphous silicon pixel radiation detectors and associated thin film transistor electronics readout

We describe the characteristics of thin (1 {mu}m) and thick (> 30 {mu}m) hydrogenated amorphous silicon p-i-n diodes which are optimized for detecting and recording the spatial distribution of charged particles, x-ray, {gamma} rays and thermal neutrons. For x-ray, {gamma} ray, and charged particle detection we can use thin p-i-n photosensitive diode arrays coupled to evaporated layers of suitable scintillators. For thermal neutron detection we use thin (2{approximately}5 {mu}m) gadolinium conve… more

Date: July 1, 1992

Creator: Perez-Mendez, V.; Cho, G.; Drewery, J.; Jing, T.; Kaplan, S. N.; Mireshghi, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Electron microscope studies

This is a report covering the research performed in the Crewe laboratory between 1964 and 1992. Because of limitations of space we have provided relatively brief summaries of the major research directions of the facility during these years. A complete bibliography has been included and we have referenced groups of pertinent publications at the beginning of each section. This report summarizes our efforts to develop better electron microscopes and chronicles many of the experimental programs, in… more

Date: July 1, 1992

Creator: Crewe, A.V. & Kapp, O.H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Explaining cloud chamber tracks

The operation of many detection devices is usually explained in terms of the ionization tracks produced by particles despite the fact that the corresponding incident wave functions extended over the entire sensitive regions of the detectors. The mechanisms by which the wave function appears to collapse to a track is analyzed here.

Date: June 16, 1992

Creator: Broyles, A. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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High-energy resolution, high-angular acceptance crystal monochromator

The design principles, construction and characterization of a 4- bounce dispersive crystal monochromator is discussed. This monochromator is designed to reduce the bandpass of synchrotron radiation to 10--50 meV level, without sacrificing angular acceptance. This is achieved by combining an asymmetrically-cut, low order reflection with a symmetrically-cut, high order reflection in a nested configuration. This monochromator is being used as a beam conditioner for nuclear resonant scattering of s… more

Date: June 1, 1992

Creator: Toellner, T.S.; Mooney, T.; Alp, E.E. (Argonne National Lab., IL (United States)) & Shastri, S. (Cornell Univ., Ithaca, NY (United States). Dept. of Applied Physics)

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A method of generating k-fluorescence x-rays

For radiation protection purposes of k-fluorescence x-rays are useful for determining the energy response of instruments and dosimeters because they are nearly monoenergetic. the International Organization for Standardization (ISO) has specified the x-ray energies and radiator and filter materials for the production of such x-rays. There are two techniques useful for producing x-rays at approximately 17 and 59 keV; these techniques produce a situation that approximates the x-ray and gamma ray e… more

Date: April 1, 1992

Creator: Fox, R.A.; Hooker, C.D. & McDonald, J.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Particle reflection and TFTR neutral beam diagnostics

Determination of two critical neutral beam parameters, power and divergence, are affected by the reflection of a fraction of the incident energy from the surface of the measuring calorimeter. On the TFTR Neutral Beam Test Stand, greater than 30% of the incident power directed at the target chamber calorimeter was unaccounted for. Most of this loss is believed due to reflection from the surface of the flat calorimeter, which was struck at a near grazing incidence (12{degrees}). Beamline calorime… more

Date: April 1, 1992

Creator: Kamperschroer, J. H.; Grisham, L. R.; Kugel, H. W.; O'Connor, T. E.; Newman, R. A.; Stevenson, T. N. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Technical design of a detector to be operated at the Superconducting Super Collider

This report discusses the following topics on the Soleoidal Detector Collaboration: Summary and overview of the detector; physics and detector requirements; central tracking system; superconducting magnet; calorimetry; muon system; electronics; online computing; offline computing; safety; experimental facilities; installation; test and calibration beam plan; and cost and schedule summary.

Date: April 1, 1992

Creator: trilling,George H

Item Type: Report

Partner: UNT Libraries Government Documents Department

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A fragment separator at LBL for beta-NMR experiment

The Beam 44 fragment separator was built at the Bevalac of LBL for NMR studies of beta emitting nuclei. {sup 37}K, {sup 39}Ca, and {sup 43}Ti fragments originating from {sup 40}Ca and {sup 46}Ti primary beams were separated by the separator for NMR studies on these nuclei. Nuclear spin polarization was created in {sup 39}Ca and {sup 43}Ti using the tilted foil technique (TFT), and the magnetic moment of {sup 43}Ti was deduced. Fragment polarization was measured for {sup 37}K and {sup 39}Ca emit… more

Date: March 1, 1992

Creator: Matsuta, K.; Ozawa, A.; Nojiri, Y.; Minamisono, T.; Fukuda, M.; Kitagawa, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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MOLE: A new high-energy gamma-ray diagnostic

Continued interest in high-energy {gamma} rays associated with fusion reactions has motivated an ongoing search for simple, effective measurement techniques. Past experiments have measured 16.7-MeV {gamma} rays with Compton-magnetic spectrometers. Some measurements have been performed with threshold Cherenkov detectors with enhanced sensitivity to high-energy {gamma} rays. The Compton spectrometers work quite well, but they require extensive calibrations and tend to be expensive and cumbersome.… more

Date: January 21, 1992

Creator: Moran, M. J. & Chang, B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The APS linac beam position monitors and electronics

Beam position monitors using stripline pickups for 30 ns long electron and positron beam bunches have been built and responses were measured in the vertical and horizontal directions. Log amplifiers used for signal processing have a dynamic range of 40 dB and are scaled for 50 mV/dB sensitivity. In this paper we describe the design of the detectors, the signal processing electronics, and the results of the position-to-signal mapping using a wire. Beam position measurements using a prototype det… more

Date: January 1, 1992

Creator: Fuja, R. & Chung, Youngjoo.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Development of a plutonium solution-assay instrument with isotopic capability

A new generation of solution-assay instrument has been developed to satisfy all the assay requirements of an aqueous plutonium-recovery operation. The assay is based on a transmission-corrected passive assay technique. We have demonstrated that the system can cover a concentration range of 0.5--300 g/{ell} with simultaneous isotopic determination. The system can be used to assay input and eluate streams of the recovery operation. The system can be modified to measure low-concentration effluent … more

Date: January 1, 1992

Creator: Hsue, S. T. & Marks, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Dry calorimetry at the Savannah River Site

Heat flow calorimeters are used at the Savannah River Site to assay radioactive sources by measuring the emitted thermal power. The radioactive source is placed in a constant temperature environment and its thermal output is measured by non-destructive assay techniques. The isotopic mass is computed from the measured power through known watts/gram constants for each of the isotopes. The Equipment Engineering Section of the Savannah River Laboratory has developed calorimetric techniques which pr… more

Date: January 1, 1992

Creator: ReFalo, L.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Generation, detection and characterization of gas-phase transition metal aggregates and compounds

The goal of our research is to employ spectroscopic techniques to characterize the bound portions of the potential energy surface (PES) for chemical systems involving diatomic and triatomic transition metal molecules. The approach incorporates the generation and isolation of new metal compounds via supersonic laser ablation molecular beam techniques. Detection and characterization is achieved using high resolution dye laser induced fluorescence spectroscopy. A major objective is to produce info… more

Date: 1992~

Creator: Steimle, Timothy C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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HLNC calibration and application to waste measurement

Using the established equations governing the counts and the underlying nuclear parameters involved in neutron coincidence measurements, the calibration procedure used in calculating the effective Pu{sup 240} mass in plutonium bearing samples is carefully reexamined and restructured in a physically and mathematically consistent form. The characteristics of this approach are described and its application to existing data illustrated. The implications for waste measurements are discussed.

Date: January 1, 1992

Creator: Lu, Ming-Shih; Teichmann, T. (Brookhaven National Lab., Upton, NY (United States)); De Ridder, P.M. & Delegard, C. (International Atomic Energy Agency, Vienna (Austria))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Investigations of nuclear structure and nuclear reactions induced by complex projectiles. [Dept. of Chemistry, Washington Univ. , St. Louis, Mo]

The research program described touches five areas of nuclear physics: nuclear structure studies at high spin (hyperdeformation in the mass A [approx equal] 182 region, structure of [sup 182]Hg and [sup 182]Au at high spin, a highly deformed band in [sup 136]Pm and the anomalous h[sub 11/2] proton crossing in the A[approximately]135 superdeformed region), studies at the interface between structure and reactions (population of entry states in heavy-ion fusion reactions, nuclear structure effects … more

Date: January 1, 1992

Creator: Sarantites, D. G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Neutron time-of-flight ion temperature diagnostic for inertial confinement fusion experiments

We are constructing a T{sub i} diagnostic for low neutron yield (5 {times} 10{sup 7} to above 10{sup 9}) d-d and d-t targets in the Nova facility at Livermore. The diagnostic measures the neutron energy spread with 960 scintillator-photomultiplier detectors located 28 m from the target and operates in the single-hit mode. Each detector can measure a single neutron arrival with time resolution of 1 ns or better. The arrival time distribution is constructed from the results of typically 200--500 … more

Date: January 1, 1992

Creator: Chrien, R. E. (Los Alamos National Lab., NM (United States)); Simmons, D. F. & Holmberg, D. L. (EG and G Energy Measurements, Inc., Las Vegas, NV (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A new radiometer for earth radiation budget studies

A critical need for the US Global Change Research Program is to provide continuous, well-calibrated radiometric data for radiation balance studies. This paper describes a new, compact, relatively light-weight, adaptable radiometer which will provide both spectrally integrated measurements and data in selected spectral bands. The radiometer design is suitable for use on (small) satellites, aircraft, or Unmanned Aerospace Vehicles (UAVs). Some considerations for the implementation of this radiome… more

Date: January 1, 1992

Creator: Weber, P. G.

Item Type: Article

Partner: UNT Libraries Government Documents Department