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SURFING: A Program for Precise Determination of Sample Position in Stress Measurements Via Neutron Diffraction

Description: Precise determination of the specimen position relative to the sampling volume for texture and stress measurements by neutron diffraction is difficult or sometimes impossible using only optical devices due to large or irregular sample dimensions and/or complicated shape of the sampling volume. The knowledge of the shape and size of the sampling volume allows development of a general mathematical model for the intensity variation with a parallelogram-shape sampling volume moving from outside to … more
Date: August 8, 2000
Creator: Wang, D.-Q.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

X-Ray Attenuation Cell

Description: To minimize the pulse-to-pulse variation, the LCLS FEL must operate at saturation, i.e. 10 orders of magnitude brighter spectral brilliance than 3rd-generation light sources. At this intensity, ultra-high vacuums and windowless transport are required. Many of the experiments, however, will need to be conducted at a much lower intensity thereby requiring a reliable means to reduce the x-ray intensity by many orders of magnitude without increasing the pulse-to-pulse variation. In this report we c… more
Date: March 3, 2000
Creator: Ryutov, D. & Toor, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

FODO/Doublet Lattice for the SNS Accumulator Ring.

Description: Requirements of minimum beam loss for hand-on maintenance and flexibility for future operations are essential for the lattice design of the Spallation Neutron Source (SNS) accumulator ring. In this paper, we present a hybrid lattice that consists of FODO arcs and doublet straights, emphasizing injection and collimation optimization and flexibility, split tunes for coupling control, sextupole families for chromaticity control, and compatibility to future upgrades.
Date: June 30, 2000
Creator: Wei, J.; Gardner, C.; Lee, Y. Y. & Tsoupas, N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Assessment of Thermal Shock Attenuation in the Particle Bed of the Spallation Neutron Source Collimator

Description: A thermal shock analysis in a particle bed that surrounds the Spallation Neutron Source (SNS) beam tube in the various collimation locations is performed using a detailed thermal/stress wave propagation formulation. The goal of this effort is to assess the response of the particle bed when subjected to the full proton beam under off-normal operating conditions and its ability to attenuate the induced stress shock. Conclusions are drawn on the basis of comparison between the responses of (a) the… more
Date: June 30, 2000
Creator: Simos, N.; Ludewig, H.; Walker, J.; Catalan-Lasheras, N.; Wei, J. & Todosow, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Preliminary estimates of dose and residual activation of selected components in ring collimation straight of the SNS

Description: The highest doses to components in the SNS ring are expected to be to those located in the collimation straight section. In this paper the authors present estimated doses to magnets and cable located between collimators. In addition the buildup of relatively long half-life radioactive isotopes is estimated, following machine operation and shutdown. Finally, the potential dose to operators approaching the machine following operation and shutdown for four hours is made. The results indicate that … more
Date: June 30, 2000
Creator: Ludewig, H.; Catalan-Lasheras, N.; Simos, N.; Walker, J.; Mallen, A.; Wei, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Beam collimation system for a 16 GeV proton driver

Description: It is shown that with the appropriate lattice and collimation design, one can control beam loss in the 16 GeV Fermilab Proton Driver. Based on detailed Monte-Carlo simulations, a 3-stage collimation system is proposed which consists of primary, secondary and supplementary collimators located in a special 60 m long injection section along with a painting system. It allows localization of more than 99% of beam loss to this section with only a 0.3 W/m (on average) beam loss rate in the rest of the… more
Date: September 12, 2000
Creator: Alexandr I. Drozhdin, Carol J. Johnstone and Nikolai V. Mokhov
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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