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Transient coherent synchrotron radiation in magnetic bending systems

Description: Transient evolution of the power radiated coherently by a charged- particle bunch orbiting between two infinite, parallel conducting plates is calculated. The plates comprise an idealized vacuum pipe in a bending magnet. The bunch moves on a trajectory such that it suddenly diverts from a straight-line path to a circular orbit and begins radiating. The influence of the plates on the transients is contrasted to their shielding of the steady-state radiated power. The effect of the radiation field… more
Date: August 1, 1996
Creator: Li, R.; Bohn, L. & Bisognano, J. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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SPENT NUCLEAR FUEL WASTE PACKAGE FILLER TESTING TECHNICAL GUIDELINES DOCUMENT

Description: The purpose of this work is to provide supporting calculations for determination of the radiation source terms specific to subsurface shielding design and analysis. These calculations are not intended to provide the absolute values of the source terms, which are under the charter of the Waste Package Operations (WPO) Group. Rather, the calculations focus on evaluation of the various combinations of fuel enrichment, burnup and cooling time for a given decay heat output, consistent with the waste… more
Date: August 28, 1996
Creator: Cogar, J.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental tests of a radiation direction finder

Description: We explore the possibility of using a simple detector to determine the direction or heading toward a source of nuclear radiation, typically penetrating neutrons or gamma rays. The technique is based on the attenuation of incident radiation across a scintillator that has been segmented so that differences between the count rates provide the orthogonal components of the local radiation vector. A number of simple measurements are carried out using plutonium, californium, and gamma-ray sources at d… more
Date: November 1, 1996
Creator: DeLanoy, M. L.; Byrd, R. C. & Russo, P. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Performance of the TLS at SRRC

Description: 3-year operation experiences of the 1.3 GeV synchrotron radiation facility at SRRC are presented. Two insertion devices (W20 and U10p) are installed in the storage ring; more are under construction. Single bunch instabilities were measured and ring impedance calculated. Both transverse and longitudinal coupled bunch instabilities were observed and corresponding feedback system constructed. The transverse feedback system is now routinely operated. A fast global orbit feedback system is in the de… more
Date: October 1, 1996
Creator: Liu, Y. C.; Chen, J. R.; Chang, C. H.; Hsu, K. T. & Kuo, C. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Atomic physics with hard X-rays from high brilliance synchrotron light sources

Description: A century after the discovery of x rays, the experimental capability for studying atomic structure and dynamics with hard, bright synchrotron radiation is increasing remarkably. Tempting opportunities arise for experiments on many-body effects, aspects of fundamental photon-atom interaction processes, and relativistic and quantum-electrodynamic phenomena. Some of these possibilities are surveyed in general terms.
Date: August 1, 1996
Creator: Southworth, S. & Gemmell, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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6 GeV synchrotron x-ray source: Conceptual design report. Supplement B - conceptual design of proposed beam lines for the 6 GeV light source

Description: In this document, preliminary conceptual designs are presented for ten sample beamlines for the 6 GeV Light Source. These beamlines will accommodate investigations in solid-state physics, materials science, materials technology, chemical technology, and biological and medical sciences. In future, the designs will be altered to include new developments in x-ray optics and hardware technologies. The research areas addressed by the samples beamlines are as follows: Topography and Radiography/Tomog… more
Date: March 1, 1996
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Synchrotron light source data book: Version 4, Revision 05/96

Description: This book is as its name implies a collection of data on existing and planned synchrotron light sources. The intention was to provide a compendium of tools for the design of electron storage rings as synchrotron radiation sources. The slant is toward the accelerator physicist as other booklets such as the X-Ray Data Booklet address the use of synchrotron radiation. It is hoped that the booklet serves as a pocket sized reference to facilitate back of the envelope type calculations. It contains s… more
Date: May 1, 1996
Creator: Murphy, J.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Smith-Purcell radiation from a 50 MeV beam

Description: A 50 MeV electron beam and a 1 mm period, 5{degree} blaze, echelle grating have been used to produce radiation in the mid-infrared spectral region. The emission is highly collimated and forward-directed. The intensity level in the few ps pulse (2 nJ/sr) indicates a degree of coherent enhancement.
Date: October 1, 1996
Creator: Brownell, J.H.; Walsh, J.; Kirk, H.G.; Fernow, R.C. & Robertson, S.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Beam lifetime investigations at SRRC

Description: The beam lifetime of the 1.3 GeV storage ring TLS (Taiwan Light Source) at SRRC was studied. Contributions of the gas scattering lifetime and Touschek scattering lifetime were measured. Effects of insertion devices, RF energy acceptance, chromaticity setting, transverse emittance coupling strength, bunch length, bunch current, etc. on the beam lifetime were measured. It is observed that this machine is Touschek lifetime dominated provided that the transverse emittance coupling strength is low e… more
Date: October 1, 1996
Creator: Kuo, C. C.; Chang, H. P.; Wang, M. H. & Weng, W. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Experimental results with cryogenically cooled, thin, silicon crystal x-ray monochromators on high-heat-flux beamlines

Description: A novel, silicon crystal monochromator has been designed and tested for use on undulator and focused wiggler beamlines at third-generation synchrotron sources. The crystal utilizes a thin, partially transmitting diffracting element fabricated within a liquid-nitrogen cooled, monolithic block of silicon. This report summarizes the results from performance tests conducted at the European Synchrotron Radiation Facility (ESRF) using a focused wiggler beam and at the Advanced Photon Source (APS) on … more
Date: August 1, 1996
Creator: Rogers, C. S.; Mills, D. M.; Lee, W. K.; Fernandez, P. B. & Graber, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Some practical aspects of undulator radiation properties

Description: It is important to be able to accurately predict the spectral and angular distribution of undulator radiation properties when designing beamlines; at new synchrotron radiation facilities or when performing radiation experiments at already existing beamlines. In practice, the particle beam emittance and beam energy spread must be taken into account in modeling these properties. The undulators fabricated today are made with small RMS phase errors, making them perform almost as, ideal devices. Cal… more
Date: November 1996
Creator: Ilinski, P.; Dejus, R. J.; Gluskin, E. & Morrison, T. I.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design, manufacture, and calibration of infrared radiometric blackbody sources

Description: A Radiometric Calibration Station (RCS) is being assembled at the Los Alamos National Laboratories (LANL) which will allow for calibration of sensors with detector arrays having spectral capability from about 0.4-15 {mu}m. The configuration of the LANL RCS. Two blackbody sources have been designed to cover the spectral range from about 3-15 {mu}m, operating at temperatures ranging from about 180-350 K within a vacuum environment. The sources are designed to present a uniform spectral radiance o… more
Date: April 1, 1996
Creator: Byrd, D. A.; Michaud, F. D. & Bender, S. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Geometry and parameter optimization of PETRA undulator beamline slits

Description: The undulator beamline at the storage ring PETRA of the Hamburger Synchrotronstrahlungslabor HASYLAB delivers hard x-ray photons usable up to 300 keV. The total power of the beam is now up to 7.5 kW with closed gap and 60 mA stored particle beam. After a planned upgrade of the undulator, the power can increase to about 15 kW. The vertical white beam slit for the PETRA undulator beamline is located at about 105 m from the source. The worst case for the slit is when all the power is absorbed in o… more
Date: August 1, 1996
Creator: Wang, Z. & Hahn, U.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

On controlling gravitational distortions in long synchrotron x-ray mirrors

Description: X-ray mirrors for synchrotron radiation beamlines must have low roughness and small figure errors to preserve source brilliance. Gravitationally-induced slope errors can be particularly detrimental for large vertically-deflecting mirrors on ultra-high brilliance third generation beamlines. Although mirror support can greatly reduce gravitational distortions, in some cases mirror support can complicate dynamic bending. We discuss techniques for controlling gravitational distortions with particul… more
Date: October 1, 1996
Creator: Ice, G.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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X-ray optics developments at the APS for third-generation synchrotron radiation sources

Description: High brilliance third-generation synchrotron radiation sources simultaneously provide both a need and an opportunity for the development of new x-ray optical components. The high power and power densities of the x-ray beams produced by insertion devices have forced researchers to consider novel, and what may seem like exotic, approaches to the mitigation of thermal distortions that can dilute the beam brilliance delivered to the experiment or next optical component. Once the power has been filt… more
Date: September 1, 1996
Creator: Mills, D.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Office for Analysis and Evaluation of Operational Data 1994-FY 95 annual report. Volume 9, Number 2

Description: This annual report of the US Nuclear Regulatory Commission`s Office for Analysis and Evaluation of Operational Data (AEOD) describes activities conducted during CY 1994 and FY 1995. The report is published in three parts. NUREG-1272, Vol. 9, No. 1, covers power reactors and presents an overview of the operating experience of the nuclear power industry from the NRC perspective, including comments about the trends of some key performance measures. The report also includes the principal findings a… more
Date: September 1, 1996
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Gamma-ray imaging of the Quinby sources

Description: The Quinby sources are alumina cylinders 7 inches in diameter and 8 inches high doped with weapons grade plutonium. We describe a computer tomography system for reconstructing three-dimensional images of these sources. Each reconstruction maps the spatial distribution of the internal [sup 241]Am gamma ray activity and is computed using an iterative, expectation-maximization algorithm with detection efficiencies based both on geometric model of the experimental setup and attenuation corrections.… more
Date: December 31, 1996
Creator: Gregor, J. & Hensley, D.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Extending synchrotron-based atomic physics experiments into the hard X-ray region

Description: The high-brightness, hard x-ray beams available from third-generation synchrotron sources are opening new opportunities to study the deepest inner shells of atoms, an area where little work has been done and phenomena not observed in less tightly bound inner-shells are manifested. In addition scattering processes which are weak at lower energies become important, providing another tool to investigate atomic structure as well as an opportunity to study photon/atom interactions beyond photoabsorp… more
Date: December 31, 1996
Creator: LeBrun, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Modeling of X-ray beamlines and devices

Description: X-ray beamlines on synchrotron sources are similar in size and complexity to beamlines at state-of-the-art neutron sources. The design principles, tools, and optimization strategies for synchrotron beamlines are also similar to those of neutron beamlines. The authors describe existing design tools for modeling synchrotron radiation beamlines and describe how these tools have evolved over the last two decades. The development of increasingly powerful modeling tools has been driven by the escalat… more
Date: December 31, 1996
Creator: Ice, G.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A state variable approach to the BESSY II local beam-position-feedback system

Description: At the BESSY II facility, stability of the electron beam position and angle near insertion devices (IDs) is of utmost importance. Disturbances due to ground motion could result in unwanted broad-bandwidth beam-jitter which decreases the electron (and resultant photon) beam`s effective brightness. Therefore, feedback techniques must be used. Operating over a frequency range of < 1- to > 100-Hz, a local feedback system will correct these beam-trajectory errors using the four bumps around IDs. Thi… more
Date: November 1, 1996
Creator: Gilpatrick, J.D.; Khan, S. & Kraemer, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Enforcement actions: Significant actions resolved individual actions. Semiannual progress report, January 1996--June 1996

Description: This document summarizes significant enforcement actions that have been resolved during the period of January-June 1996. The report includes copies of Orders and Notices of Violations sent by the Nuclear Regulatory Commission to individuals with respect to the enforcement actions.
Date: August 1, 1996
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Study of electron-capture delayed fission in Am-232

Description: An automated x-ray-fission coincidence system was designed and constructed by LLNL and Lawrence Berkeley National Laboratory (LBNL) for use inside the Gammasphere high efficiency gamma-ray detector array at LBNL. The x-ray-fission coincidence apparatus detection station consists of two surface barrier detectors (for detection of fission fragments) and two high-purity Ge (HPGe) planar x-ray detectors (for measurement of x-rays and low-energy gamma rays). The detection station is placed inside Ga… more
Date: March 18, 1996
Creator: Kreek, Steven A.; Hall, Howard L.; Hoffman, Darleane C.; Strellis, Daniel & Gregorich, Kenneth E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Structural biology research at the National Synchroton Light Source

Description: The world`s foremost facility for scientific research using x-rays and ultraviolet and infrared radiation is operated by the national synchrotron Light Source Department. This year alone, a total of 2200 guest researchers performed experiments at the world`s largest source of synchrotron light. Researchers are trying to define the three- dimensional structures of biological macromolecules to create a map of life, a guide for exploring the biological and chemical interactions of the vast variety… more
Date: May 1, 1996
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Brilliance and flux reduction in imperfect inclined crystals

Description: The inclined crystal geometry has been suggested as a method of reducing the surface absorbed power density of high-heat-load monochromators for third-generation synchrotron radiation sources. Computer simulations have shown that if the crystals are perfectly aligned and have no strains then the diffraction properties of a pair of inclined crystals are very similar to a pair of conventional flat crystals with only subtle effects differentiating the two configurations. However, if the crystals a… more
Date: January 1, 1996
Creator: Lee, W. K.; Blasdell, R. C.; Fernandez, P. B.; Macrander, A. T. & Mills, D. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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