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Physics of the {sup 252}Cf-source-driven noise analysis measurement

Description: The {sup 252}Cf-source-driven noise analysis method is a versatile measurements tool that has been applied to measurements for initial loading of reactors, quality assurance of reactor fuel elements, fuel processing facilities, fuel reprocessing facilities, fuel storage facilities, zero-power testing of reactors, verification of calculational methods, process monitoring, characterization of storage vaults, and nuclear weapons identification. This method`s broad range of application is due to th… more
Date: February 1, 1997
Creator: Valentine, T.E.; Mihalczo, J.T.; Perez, R.B. & Mattingly, J.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Emittance dilution through coherent energy spread generation in bending systems

Description: For a bunched beam, coherent energy spread generated within a bending system may couple to the transverse (bending) plane coordinates through the chromatic transfer functions of the particular beamline - even an achromatic beamline. The resulting transverse emittance dilution is dependent on the magnitude of the energy spread, its generation rate along the beamline, and the beamline`s chromatic transfer functions. The coherent energy spread may be due to resistive-wall wakefields or coherent sy… more
Date: May 1, 1997
Creator: Emma, P. & Brinkmann, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Use of low power EM radar sensors for speech articulator measurements

Description: Very low power electromagnetic (EM) wave sensors are being used to measure speech articulator motions such as the vocal fold oscillations, jaw, tongue, and the soft palate. Data on vocal fold motions, that correlate well with established laboratory techniques, as well as data on the jaw, tongue, and soft palate are shown. The vocal fold measurements together with a volume air flow model are being used to perform pitch synchronous estimates of the voiced transfer functions using ARMA (autoregres… more
Date: May 14, 1997
Creator: Holzrichter, J. F. & Burnett, G. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analyzing measurements of nonlinear transfer functions with Tschebyshev polynomials

Description: Recently, due to advances in computers and data aquisition systems, the following type of measurement has become more common: (1) Impress a given modulation on a device to be tested. (2) Acquire a data stream, usually at equally spaced sample intervals, of the response of the system to the modulation. (3) Fit the data thereby acquired to some nonlinear function set that might (or might not!) describe the response of the device. In this paper it is pointed out that by choosing to modulate the te… more
Date: June 1, 1997
Creator: Krafft, G. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Comparison of beam-position-transfer functions using circular beam-position monitors

Description: A cylindrical beam-position monitor (BPM) used in many accelerator facilities has four electrodes on which beam-image currents induce bunched-beam signals. These probe-electrode signals are geometrically configured to provide beam-position information about two orthogonal axes. An electronic processor performs a mathematical transfer function (TF) on these BPM-electrode signals to produce output signals whose time-varying amplitude is proportional to the beam`s vertical and horizontal position.… more
Date: October 1, 1997
Creator: Gilpatrick, J.D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Description and operation of the LEDA beam-position/intensity measurement module

Description: This paper describes the specification, design and preliminary operation of the beam-position/intensity measurement module being built for the Low Energy Demonstration Accelerator (LEDA) and Accelerator Production of Tritium (APT) projects at Los Alamos National Laboratory. The module, based on the VXI footprint, is divided into three sections: first, the analog front-end which consists of logarithmic amplifiers, anti-alias filters, and digitizers; second, the digital-to-analog section for moni… more
Date: October 1, 1997
Creator: Rose, C.R. & Stettler, M.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Longitudinal beam-transfer-function measurements at the SLC damping rings

Description: A longitudinal single-bunch instability in the damping rings at the Stanford Linear Collider (SLC) is thought to contribute to pulse-to-pulse orbit variations in downstream accelerator sections. To better understand this instability, the authors measured the beam phase and bunch length under harmonic modulations of the rf phase and rf voltage. For small phase-modulations the measured response can be explained by interaction of the beam with the cavity fundamental mode. For larger excitations, t… more
Date: May 1, 1997
Creator: Minty, M. G. & Zimmermann, F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A coupled-bunch ion instability in the SLC electron damping ring

Description: Under abnormally poor vacuum conditions in the electron damping ring, described in a companion paper at this conference, an emittance blowup was observed related to a transverse instability. The instability was only observed with two bunches in the ring, and could not be seen with single bunch operation, even at the same total beam current as for the two bunches. Measurements of the transverse Beam Transfer Function indicate strong coupling between the two bunches when ions are present. This is… more
Date: May 1, 1997
Creator: Krejcik, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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