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Inclusive hadron distributions in p+p collisions from saturation models of HERA DIS data. (open access)

Inclusive hadron distributions in p+p collisions from saturation models of HERA DIS data.

Dipole models based on various saturation scenarios provide reasonable fits to small-x DIS inclusive, diffractive and exclusive data from HERA. Proton un-integrated gluon distributions extracted from such fits are employed in a k{sub {perpendicular}}-factorization framework to calculate inclusive gluon distributions at various energies. The n-particle multiplicity distribution predicted in the Glasma flux tube approach shows good agreement with data over a wide range of energies. Hadron inclusive transverse momentum distributions expressed in terms of the saturation scale demonstrate universal behavior over a wider kinematic range systematically with increasing center of mass energies.
Date: December 6, 2010
Creator: Tribedy, P. & Venugopalan, R.
System: The UNT Digital Library
Image Processing and Control of a Programmable Spatial Light Modulator for Optic Damage Protection (open access)

Image Processing and Control of a Programmable Spatial Light Modulator for Optic Damage Protection

The heart of the National Ignition Facility is a megajoule-class laser system consisting of 192 beams used to drive inertial confinement fusion reactions. A recently installed system of programmable, liquid-crystal-based spatial light modulators adds the capability of arbitrarily shaping the spatial beam profiles in order to enhance operational flexibility. Its primary intended use is for introducing 'blocker' obscurations shadowing isolated flaws on downstream optical elements that would otherwise be damaged by high fluence laser illumination. Because an improperly shaped blocker pattern can lead to equipment damage, both the position and shape of the obscurations must be carefully verified prior to high-fluence operations. An automatic alignment algorithm is used to perform detection and estimation of the imposed blocker centroid positions compared to their intended locations. Furthermore, in order to minimize the spatially-varying nonlinear response of the device, a calibration of the local magnification is performed at multiple sub-image locations. In this paper, we describe the control and associated image processing of this device that helps to enhance the safety and longevity of the overall system.
Date: December 6, 2010
Creator: Awwal, A.; Leach, R.; Brunton, G.; Tse, E.; Matone, J. & Heebner, J.
System: The UNT Digital Library
A Case for the Use of 3-D Attenuation Models in Ground Motion and Seismic Hazard Assessment (open access)

A Case for the Use of 3-D Attenuation Models in Ground Motion and Seismic Hazard Assessment

None
Date: December 6, 2010
Creator: Pasyanos, M E
System: The UNT Digital Library
On the mechanism for plasma hydrogenation of graphene (open access)

On the mechanism for plasma hydrogenation of graphene

This article discusses the mechanism for plasma hydrogenation of graphene.
Date: December 6, 2010
Creator: Jones, Jason D.; Hoffmann, William D.; Jesseph, Aaron V.; Morris, Christopher; Verbeck, Guido F. & Pérez, José M.
System: The UNT Digital Library