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On the massless gap'' adjustment of detected energy for passive material in front of a calorimeter

Description: I have designed a correction scheme for energy losses in passive material in front of a calorimeter based on the massless gap'' idea. I use a flexible geometry model of a calorimeter design for SDC outside of a solenoidal coil made of aluminium cylinders of adjustable thickness. The signal from the first radiation length of active calorimetry is scaled dependent on the incoming and observed energies of the shower. A reasonable recovery of the resolution of an unobstructed calorimeter is achieve… more
Date: January 31, 1992
Creator: Trost, H.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Permeability Changes in Coal Resulting From Gas Desorption

Description: Eventually, the weight stabilized and the measurements commenced. Helium pressure was increased slowly and carefully, first to 15 psig then to 28 psig. The readout for the balance unit continued to exhibit unexplained fluctuation and output. Buoyancy of the empty pan was measured at pressures ranging up to 800 psig measured at approximately 100 psig increments. The balance weighing unit exhibited a progressive increase in weight with increasing pressure demonstrating that the displacement volum… more
Date: January 1, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Permeability Changes in Coal Resulting From Gas Desorption

Description: This report documents studies on the effects of gas sorption on coal, with the intent of eventually evaluating how sorption and strain affect permeability. These studies were, carried out at the University of Alabama during the period from 1989 through 1992. Two major experimental methods were developed and used. In the strain experiments, electronic strain gauges were attached to polished blocks of coal in order to measure linear and volumetric swelling due to gas sorption. The effects of bedd… more
Date: November 30, 1992
Creator: Levine, J. R. & Johnson, P. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A correction scheme for the quadrupole misalignment errors in the ANL--APS positron linac

Description: The Argonne Advanced Photon Source (APS) positron linac contains 24 quadrupoles of which 22 are configured as a FODO system and are distributed along the last 7 constant gradient accelerating structures. Errors in quadrupole and waveguide positions deflect the positron beam centroid, contributing to the aperture requirements in the accelerating structures and quadrupoles. A correction scheme using correction dipole magnets is proposed to compensate for the random errors in quadrupoles.
Date: January 1, 1992
Creator: Nassiri, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Improvement of Azimuthal Homogeneity in Permanent-Magnet Bearing Rotors

Description: Permanent magnets that are levitated and rotating over a bulk high-temperature superconductor (HTS) form the basis of many superconducting bearing designs. Experiments have shown that the rotational-loss coefficient of friction'' for thrust bearings of this type can be as low as 8 [times] 10[sup [minus]6]. While the loss mechanisms of such bearings are not well understood, the azimuthal homogeneity of the rotating permanent magnet is believed to play an important role in determining the loss. O… more
Date: October 23, 1992
Creator: Hull, J. R.; Rossing, T. D.; Mulcahy, T. M. & Uherka, K. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Many-body corrections in XAFS

Description: The importance of many-body effects in the theory of XAFS is reviewed. The dominant effects are inelastic losses: Extrinsic losses refer to inelastic losses in the propagation of the photoelectron and are treated using a complex, energy-dependent self-energy. The real part of the self-energy yields an important energy-dependent shift in the phase of the XAFS oscillations, while the imaginary part contributes to the mean-free-path. Intrinsic losses refer to losses associated with the creation of… more
Date: January 1, 1992
Creator: Rehr, J.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Aspects of symmetry violation

Description: Violations of symmetries have been used to determine (or test) the theoretical dynamics or to study structure. Recent experiments on parity non-conservation and time reversal symmetry, and that depend on spin properties, are used to illustrate both applications.
Date: January 1, 1992
Creator: Henley, E. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Correcting field harmonics after design in superconducting magnets

Description: For a variety of reasons the actual field harmonics, as measured, in the superconducting magnets come out to be somewhat different than what were intended at the time of design. In this paper we shall discuss the schemes which can be used to correct them in the magnets. We shall discuss them for both the allowed and non-allowed harmonics. Since the deviation in field harmonics from their design value is mainly related to the mechanical properties of the coil cross section, in order for a scheme… more
Date: January 1, 1992
Creator: Gupta, R.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A dip-dependent divergence correction

Description: A divergence correction is conventionally applied to zero-offset data in an effort to preserved amplitude information. The conventional divergence correction compensates for the geometrical spreading of a point source in a horizontally layered medium where velocity varies with depth only. The dip-dependent divergence correction extends the conventional correction for improved amplitude processing of dipping beds. The dip-dependent divergence correction is computed by dynamic ray tracing, and ap… more
Date: 1992~
Creator: Fazzari, F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

QCD corrections to Higgs boson production

Description: We discuss the O({alpha}{sub s}) QCD radiative corrections to Higgs boson production in the limit in which the top quark is much heavier than the Higgs boson. The subleading corrections, of O({alpha}{sub s}M{sub H}{sup 2}/M{sub top}{sup 2}), are presented for the decay H {yields} {gamma}{gamma} and shown to be small.
Date: November 1, 1992
Creator: Dawson, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Tau decays: A theoretical perspective

Description: Theoretical predictions for various tau decay rates are reviewed. Effects of electroweak radiative corrections are described. Implications for precision tests of the standard model and ``new physics`` searches are discussed. A perspective on the tau decay puzzle and 1-prong problem is given.
Date: November 1, 1992
Creator: Marciano, W. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Permeability Changes in Coal Resulting From Gas Desorption. Final Report

Description: This report documents studies on the effects of gas sorption on coal, with the intent of eventually evaluating how sorption and strain affect permeability. These studies were, carried out at the University of Alabama during the period from 1989 through 1992. Two major experimental methods were developed and used. In the strain experiments, electronic strain gauges were attached to polished blocks of coal in order to measure linear and volumetric swelling due to gas sorption. The effects of bedd… more
Date: November 30, 1992
Creator: Levine, J. R. & Johnson, P. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Aspects of Symmetry Violation

Description: Violations of symmetries have been used to determine (or test) the theoretical dynamics or to study structure. Recent experiments on parity non-conservation and time reversal symmetry, and that depend on spin properties, are used to illustrate both applications.
Date: Autumn 1992
Creator: Henley, Ernest M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

On the ``Massless Gap`` Adjustment of Detected Energy for Passive Material in Front of a Calorimeter

Description: I have designed a correction scheme for energy losses in passive material in front of a calorimeter based on the ``massless gap`` idea. I use a flexible geometry model of a calorimeter design for SDC outside of a solenoidal coil made of aluminium cylinders of adjustable thickness. The signal from the first radiation length of active calorimetry is scaled dependent on the incoming and observed energies of the shower. A reasonable recovery of the resolution of an unobstructed calorimeter is achie… more
Date: January 31, 1992
Creator: Trost, Hans-Jochen
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An optimal procedure for magnet sorting

Description: A new magnet sorting method for accelerators is developed. It is based on the linearized analysis of the effects of errors on accelerators. It is implementable in two steps. The first step is completely analytical in character while the second step involves the comparison of computed values with the measured error values. The whole process is repeated at most ``n`` times, where ``n`` is the number of magnets to be chosen from at a time. Simulations of the method, using Mathematica{reg_sign}, ha… more
Date: December 31, 1992
Creator: Koul, R. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Many-body corrections in XAFS

Description: The importance of many-body effects in the theory of XAFS is reviewed. The dominant effects are inelastic losses: Extrinsic losses refer to inelastic losses in the propagation of the photoelectron and are treated using a complex, energy-dependent self-energy. The real part of the self-energy yields an important energy-dependent shift in the phase of the XAFS oscillations, while the imaginary part contributes to the mean-free-path. Intrinsic losses refer to losses associated with the creation of… more
Date: December 31, 1992
Creator: Rehr, J. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Improvement of Azimuthal Homogeneity in Permanent-Magnet Bearing Rotors

Description: Permanent magnets that are levitated and rotating over a bulk high-temperature superconductor (HTS) form the basis of many superconducting bearing designs. Experiments have shown that the rotational-loss``coefficient of friction`` for thrust bearings of this type can be as low as 8 {times} 10{sup {minus}6}. While the loss mechanisms of such bearings are not well understood, the azimuthal homogeneity of the rotating permanent magnet is believed to play an important role in determining the loss. … more
Date: October 23, 1992
Creator: Hull, J. R.; Rossing, T. D.; Mulcahy, T. M. & Uherka, K. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Finite-difference migration to zero offset

Description: Migration to zero offset (MZO), also called dip moveout (DMO) or prestack partial migration, transforms prestack offset seismic data into approximate zero-offset data so as to remove reflection point smear and obtain quality stacked results over a range of reflector dips. MZO has become an important step in standard seismic data processing, and a variety of frequency-wavenumber (f-k) and integral MZO algorithms have been used in practice to date. Here, I present a finite-difference MZO algorith… more
Date: July 1992
Creator: Li, Jianchao
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A dip-dependent divergence correction

Description: A divergence correction is conventionally applied to zero-offset data in an effort to preserved amplitude information. The conventional divergence correction compensates for the geometrical spreading of a point source in a horizontally layered medium where velocity varies with depth only. The dip-dependent divergence correction extends the conventional correction for improved amplitude processing of dipping beds. The dip-dependent divergence correction is computed by dynamic ray tracing, and ap… more
Date: July 1992
Creator: Fazzari, Franscesca
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

Correcting field harmonics after design in superconducting magnets

Description: For a variety of reasons the actual field harmonics, as measured, in the superconducting magnets come out to be somewhat different than what were intended at the time of design. In this paper we shall discuss the schemes which can be used to correct them in the magnets. We shall discuss them for both the allowed and non-allowed harmonics. Since the deviation in field harmonics from their design value is mainly related to the mechanical properties of the coil cross section, in order for a scheme… more
Date: October 1, 1992
Creator: Gupta, R. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

QCD corrections to Higgs boson production

Description: We discuss the O([alpha][sub s]) QCD radiative corrections to Higgs boson production in the limit in which the top quark is much heavier than the Higgs boson. The subleading corrections, of O([alpha][sub s]M[sub H][sup 2]/M[sub top][sup 2]), are presented for the decay H [yields] [gamma][gamma] and shown to be small.
Date: November 1, 1992
Creator: Dawson, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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