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Operation and radiation resistance of a FOXFET biasing structure for silicon strip detectors

Description: AC-coupled strip detectors biased with a FOXFET transistor structure have been studied. Measurement results for the basic operational characteristics of the FOXFET are presented together with a brief description of the physics underlying its operation. Radiation effects were studied using photons from a {sup 137}Cs source. Changes in the FOXFET characteristics as a function of radiation dose up to 1 MRad are reported. Results about the effect of radiation on the noise from a FOXFET biased detec… more
Date: February 1, 1992
Creator: Laakso, M. (Fermi National Accelerator Lab., Batavia, IL (United States) Helsinki Univ. (Finland). Dept. of High Energy Physics); Singh, P.; Engels, E. Jr. & Shepard, P. (Pittsburgh Univ., PA (United States). Dept. of Physics and Astronomy)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Readily implemented enhanced sinusoid detection in noise

Description: Significant efforts have been devoted, spanning many years, to the problem of sinusoid detection in noise. Many of these efforts have produced superb, yet complex, algorithms which may be difficult to use for a wide segment of the Digital Signal Processing (DSP) community. This paper presents a simple, easily implemented and high effective method which solves this problem. This method severely degrades non-sinusoidal noise while leaving the embedded sinusoid(s) relatively undisturbed. The algor… more
Date: March 5, 1992
Creator: Lindsay, K.V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

New techniques for positron emission tomography in the study of human neurological disorders

Description: The general goals of the physics and kinetic modeling projects are to: (1) improve the quantitative information extractable from PET images, and (2) develop, implement and optimize tracer kinetic models for new PET neurotransmitter/receptor ligands aided by computer simulations. Work towards improving PET quantification has included projects evaluating: (1) iterative reconstruction algorithms using supplemental boundary information, (2) automated registration of dynamic PET emission and transmi… more
Date: January 1, 1992
Creator: Kuhl, D.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Seismic refraction survey of the ANS preferred site

Description: Between September 19, 1991 and October 8, 1991 personnel from Martin Marietta Energy Systems, Inc. (Energy Systems), Automated Sciences Group, Inc., and Marrich, Inc. performed a seismic refraction survey at the Advanced Neutron Source (ANS) preferred site. The purpose of this survey was to provide estimates of top-of-rock topography, based on seismic velocities, and to delineate variations in rock and soil velocities. Forty-four seismic refraction spreads were shot to determine top-of-rock dep… more
Date: February 1, 1992
Creator: Davis, R.K. (Automated Sciences Group, Inc., Oak Ridge, TN (United States)); Hopkins, R.A. (Marrich, Inc., Knoxville, TN (United States)) & Doll, W.E. (Oak Ridge National Lab., TN (United States))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

System response to relay chatter

Description: An important aspect of the qualification of safety related systems, is the assessment of the possibility and consequences of seismic or vibration induced relay chatter. The current rules, contained in ANSI/IEEE C37.98 and the SQUG GIP, consider as seismic induced failure'' of a relay, a chatter contact in excess of 2 milliseconds. While this rule is clear in defining failure'' of single relay, the definition of failure'' becomes more problematic when we consider the alignment of an assembly of … more
Date: January 1, 1992
Creator: Antaki, G. A. & Radder, J. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Application of photothermal deflection spectroscopy to electrochemical interfaces

Description: This dissertation discusses the theory and practice of Photothermal Deflection Spectroscopy (PDS, which is also known as probe beam deflection spectroscopy, PBDS, probe deflection technique, and mirage effect spectroscopy) with respect to electrochemical systems. Much of the discussion is also relevant to non-electrochemical systems. PDS can measure the optical absorption spectrum of interfaces and concentration gradients in the electrolyte adjacent to the electrode. These measurements can be m… more
Date: March 1, 1992
Creator: Rudnicki, J. D.; McLarnon, F. R. & Cairns, E. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of FOXFET biased ac-coupled silicon strip detector prototypes for CDF SVX upgrade

Description: Silicon microstrip detectors for high-precision charged particle position measurements have been used in nuclear and particle physics for years. The detectors have evolved from simple surface barrier strip detectors with metal strips to highly complicated double-sided AC-coupled junction detectors. The feature of AC-coupling the readout electrodes from the diode strips necessitates the manufacture of a separate biasing structure for the strips, which comprises a common bias line together with a… more
Date: March 1, 1992
Creator: Laakso, M. (Fermi National Accelerator Lab., Batavia, IL (United States) Research Inst. for High Energy Physics (SEFT), Helsinki (Finland))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Summary of ORNL long-term surveillance at the FFTF

Description: Oak Ridge National Laboratory has used an automated system between 1983 and 1987 to collect and analyze primary system noise data at the Fast Flux Test Facility (FFTF) located in Hanford, Washington, System operation and data handling are described, data collection efforts are summarized, and principal findings are presented.
Date: August 1, 1992
Creator: Damiano, B. & Thie, J.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

JFET monolithic preamplifier with outstanding noise behaviour and radiation hardness characteristics

Description: A second series of monolithic preamplifiers based on epitaxial channel JFETs and intended for calorimetry at hadron colliders has been realized. The employed buried layer process has been upgraded, resulting in a lower pinch-off voltage and a reduced power dissipation. Results will be presented on noise, dynamic behavior and radiation damage. New versions of the preamplifier have been designed for both large capacitance detectors and for low capacitance pre-shower detectors.
Date: October 1, 1992
Creator: Radeka, V.; Rescia, S. (Brookhaven National Lab., Upton, NY (United States)); Manfredi, P.F.; Speziali, V. & Svelto, F. (Pavia Univ. (Italy). Dipt. di Elettronica)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Monolithic preamplifier employing epitaxial N-channel JFETs

Description: This paper reports the results obtained in the research program oriented to the realisation of a monolithic preamplifier for calorimetry applications at high luminosity colliders. The main purpose of the program is to arrive at a monolithic realisation with a performance as close as possible to that of discrete preamplifiers. The junction field-effect transistors employed in discrete preamplifiers have an epitaxial channel and a very heavily doped gate diffused onto it. They present the best no… more
Date: February 1, 1992
Creator: Radeka, V.; Rescia, S. (Brookhaven National Lab., Upton, NY (United States)); Manfredi, P.F.; Re, V. & Speziali, V. (Pavia Univ. (Italy). Dipt. di Elettronica Istituto Nazionale di Fisica Nucleare, Milan (Italy))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Environmental risk assessment for start-up of a new consolidated maintenance facility

Description: This paper summarizes a case study of a risk assessment for a consolidated maintenance facility (CMF). An interdisciplinary team was formed to identify and evaluate showstopper'' risks which could delay or prevent ontime, safe, and economical operation of a CMF and to recommend ways to mitigate the risks. The risk assessment was constrained by time, information, incomplete plans and facilities, and a concomitant major transition in manufacturing process, organization, and technology. Working wi… more
Date: October 1, 1992
Creator: Heubach, J. G. & Wise, J. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Frequency domain transfer function identification using the computer program SYSFIT

Description: Because the primary application of SYSFIT for BPA involves studying power system dynamics, this investigation was geared toward simulating the effects that might be encountered in studying electromechanical oscillations in power systems. Although the intended focus of this work is power system oscillations, the studies are sufficiently genetic that the results can be applied to many types of oscillatory systems with closely-spaced modes. In general, there are two possible ways of solving the op… more
Date: December 1, 1992
Creator: Trudnowski, D.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Preliminary test results from a telescope of Hughes pixel arrays at FNAL

Description: In December of 1991 three silicon hybrid pixel detectors each having 2.56 {times} 2.56 pixels 30 {mu}m square, made by the Hughes Aircraft Company, were placed in a high energy muon beam at the Fermi National Accelerator Laboratory. Straight tracks were recorded in these detectors at angles to the normal to the plane of the silicon ranging from 0 to 45{degrees}. In this note, preliminary results are presented on the straight through tracks, i.e., those passing through the telescope at normal in… more
Date: September 1, 1992
Creator: Jernigan, J. G.; Arens, J.; Vezie, D.; Shapiro, S. L.; Collins, T.; Krider, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Optical signal acquisition and processing in future accelerator diagnostics

Description: Beam detectors such as striplines and wall current monitors rely on matched electrical networks to transmit and process beam information. Frequency bandwidth, noise immunity, reflections, and signal to noise ratio are considerations that require compromises limiting the quality of the measurement. Recent advances in fiber optics related technologies have made it possible to acquire and process beam signals in the optical domain. This paper describes recent developments in the application of the… more
Date: December 31, 1992
Creator: Jackson, G. P. & Elliott, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Environmental assessment of remedial action at the Gunnison Uranium Mill Tailings Site near Gunnison, Colorado. Final

Description: The presence of contaminated uranium mill tailings adjacent to the city of Gunnison has been a local concern for many years. The following issues were identified during public meetings that were held by the DOE prior to distribution of an earlier version of this EA. Many of these issues will require mitigation. Groundwater contamination; in December 1989, a herd of 105 antelope were introduced in an area that includes the Landfill disposal site. There is concern that remedial action-related tra… more
Date: February 1, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of FOXFET biased ac-coupled silicon strip detector prototypes for CDF SVX upgrade

Description: Silicon microstrip detectors for high-precision charged particle position measurements have been used in nuclear and particle physics for years. The detectors have evolved from simple surface barrier strip detectors with metal strips to highly complicated double-sided AC-coupled junction detectors. The feature of AC-coupling the readout electrodes from the diode strips necessitates the manufacture of a separate biasing structure for the strips, which comprises a common bias line together with a… more
Date: March 1, 1992
Creator: Laakso, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

New techniques for positron emission tomography in the study of human neurological disorders

Description: The general goals of the physics and kinetic modeling projects are to: (1) improve the quantitative information extractable from PET images, and (2) develop, implement and optimize tracer kinetic models for new PET neurotransmitter/receptor ligands aided by computer simulations. Work towards improving PET quantification has included projects evaluating: (1) iterative reconstruction algorithms using supplemental boundary information, (2) automated registration of dynamic PET emission and transmi… more
Date: July 1, 1992
Creator: Kuhl, D. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Seismic refraction survey of the ANS preferred site

Description: Between September 19, 1991 and October 8, 1991 personnel from Martin Marietta Energy Systems, Inc. (Energy Systems), Automated Sciences Group, Inc., and Marrich, Inc. performed a seismic refraction survey at the Advanced Neutron Source (ANS) preferred site. The purpose of this survey was to provide estimates of top-of-rock topography, based on seismic velocities, and to delineate variations in rock and soil velocities. Forty-four seismic refraction spreads were shot to determine top-of-rock dep… more
Date: February 1, 1992
Creator: Davis, R. K.; Hopkins, R. A. & Doll, W. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Apparatus for preparing a sample for mass spectrometry

Description: Disclosed is an apparatus for preparing a sample for analysis by a mass spectrometer system. The apparatus has an entry chamber and an ionization chamber separated by a skimmer. A capacitor having two space-apart electrodes followed by one or more ion-imaging lenses is disposed in the ionization chamber. The chamber is evacuated and the capacitor is charged. A valve injects a sample gas in the form of sample pulses into the entry chamber. The pulse is collimated by the skimmer and enters the io… more
Date: December 31, 1992
Creator: Villa-Aleman, E.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Signal and noise analysis of a-Si:H radiation detector-amplifier system

Description: Hydrogenated amorphous silicon (a-Si:H) has potential advantages in making radiation detectors for many applications because of its deposition capability on a large-area substrate and its high radiation resistance. Position-sensitive radiation detectors can be made out of a 1d strip or a 2-d pixel array of a Si:H pin diodes. In addition, signal processing electronics can be made by thin-film transistors on the same substrate. The calculated radiation signal, based on a simple charge collection … more
Date: March 1, 1992
Creator: Cho, Gyuseong
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

The Argonne Wakefield Accelerator (AWA) laser system and its associated optics

Description: Generating a 100 nC, 15 ps pulse length electron beam at the AWA requires a stable laser system capable of producing 1--3 ps, 5 mJ at 248 nm with the ability to shape the wave front. We have installed a combined Coherent ultra fast 702 dye laser and Lambda Physik excimer pulsed amplification system which meets these requirements. A device has been built to produce shaped laser pulses. Detailed characterizations of the laser system, its associated optics development, and timing/amplitude stabili… more
Date: July 1, 1992
Creator: Gai, W.; Konecny, R. & Power, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Environmental assessment for the Waste Water Treatment Facility at the West Valley Demonstration Project and finding of no significant impact

Description: The possible environmental impacts from the construction and operation of a waste water treatment facility for the West Valley Demonstration Project are presented. The West Valley Project is a demonstration project on the solidification of high-level radioactive wastes. The need for the facility is the result of a rise in the work force needed for the project which rendered the existing sewage treatment plant incapable of meeting the nonradioactive waste water treatment needs.
Date: December 31, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Differential equation-based seismic data filtering

Description: Suppressing noise and enhancing useful seismic signal by filtering is one of the important tasks of seismic data processing. conventional filtering methods are implemented through either the convolution operation or various mathematical transforms. In this paper, we describe a methodology for studying and implementing filters, which, unlike those conventional filtering methods, is based on solving differential equations in the time and space domain. We call this kind of filtering differential e… more
Date: May 1992
Creator: Li, Jianchao & Larner, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A novel photomultiplier tube for calorimetry at the SSC

Description: A silicon target photomultiplier tube with an anode consisting of a large area Avalanche Photodiode (APD) has been developed. The tube combines the advantages of an avalanche photodiode, excellent linearity and large dynamic range, with the properties of a phototube. The tube structure is proximity focussing, which is not affected by high magnetic fields approximately aligned with the axis. The high linearity makes this device attractive for calorimetry at the SSC. The extension of this concept… more
Date: September 1, 1992
Creator: Cushman, P.; Iosue, M.; Johnson, B.; Madden, M.; Szawlowski, M. & Rusack, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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