Improved cellulose X-ray diffraction analysis using Fourier series modeling
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Materials Science↗
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Results for “DIFFRACTION MODELS”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Plastic anisotropy and twin distributions near the fatigue crack tip of textured Mg alloys from in s
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Xie, Di↗
Optical, structural and aging properties of Al/Sc-based multilayers for the extreme ultraviolet
This manuscript presents the structural characterization of Al/Sc-based periodic multilayer coatings for the extreme ultraviolet (EUV) spectral range. Based on transmission electron microscopy and electron diffraction as well as grazing-incidence and large-angle x-ray diffraction, a model for the layer structure and the interfacial effects of Al/Sc coatings is built. The onset of crystallization in nanoscale Al and Sc layers as a function of thickness is also revealed in these characterizations. The Al/Sc layer model is validated and further refined by fitting in-band and out-of-band EUV reflectance measurements across 5 orders of magnitude in an extended wavelength range from 17 to 80 nm. Here, the same type of EUV reflectance measurements is used to test the Al/Sc aging properties and to demonstrate the spectral response of optimized two- and tri-material multilayers including Al/Sc, Al/Sc/SiC and Mo/Al/Sc.
36 MATERIALS SCIENCE↗
After-Dinner Speech: Diffraction 2014
No abstract prepared.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Impact factor for high-energy two and three jets diffractive production
We present the calculation of the impact factor for the photon to quark, antiquark and gluon transition within Balitsky’s shock-wave formalism. We also rederive the impact factor for photon to quark and antiquark transition. These results provide the necessary building blocks for further phenomenological studies of inclusive diffractive deep inelastic scattering as well as for two and three jets diffractive production which go beyond approximations discussed in the literature.
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
Test of factorization in diffractive deep inelastic scattering and photoproduction at HERA
The QCD factorization theorem in diffraction is tested by comparing diffractive jet production data to QCD predictions based on fits to inclusive diffractive cross section data. H1 measured dijet production with a leading proton detected in the Very Forward Proton Spectrometer (VFPS), both in deep-inelastic scattering and in photoproduction. The DIS measurements are complemented by measurements of dijet production with an associated rapidity gap and in a data sample selected with a leading proton in the Forward Proton Spectrometer (FPS)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Diffraction and forward physics results of the ATLAS experiment from the Run I
Various aspects of forward physics have been studied by the ATLAS collaboration using data from Run I at the LHC. In this text, main results of four published analyses are summarized, all based on data from proton-proton collisions at √(s)=7 TeV collected in 2010 or 2011. Two analyses deal with the diffractive signature, one based on single-sided events, the other on large rapidity gaps in soft events. In addition, a recent measurement of the total pp cross section using the ALFA subdetector and a recent study of higher-order QCD effects using a jet veto are discussed.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Double pomeron exchange: The early years
I review the early experimental searches for double pomeron exchange, the first observations at the CERN Intersecting Storage Rings (ISR) and further studies at the SPS and Tevatron (fixed target). I only have space for a superficial coverage of some highlights, and will not cover later colliders with √(s)>100 GeV.
43 PARTICLE ACCELERATORS↗
CMS results on exclusive and diffractive production
We present recent CMS measurements of diffractive and exclusive processes, using data collected at 7 TeV at the LHC. Measurements of soft single- and double-diffractive cross sections are presented, as well as measurements of photon-induced processes including studies of exclusive WW production via photon-photon exchange.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Renormalization group analysis of Reggeon field theory: Flow equations
Can large distance high energy QCD be described by Reggeon field theory as an effective emergent theory? We start to investigate the issue employing functional renormalisation group techniques.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
NLO vertex for a forward jet plus a rapidity gap at high energies
We present the calculation of the forward jet vertex associated to a rapidity gap (coupling of a hard pomeron to the jet) in the BFKL formalism at next-to-leading order (NLO). Real emission contributions are computed via Lipatov’s effective action. The NLO jet vertex turns out to be finite within collinear factorization and allows, together with the NLO non-forward gluon Green’s function, to perform NLO studies of jet production in diffractive events (e.g. Mueller-Tang dijets)
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
Particle production with rapidity correlations in proton-nucleus collisions
We illustrate how a generalization of the JIMWLK formalism which treats independently the direct and complex conjugate amplitudes can be used to describe semi-inclusive multiparticle production with rapidity correlations in pA collisions. The evolution equations that are obtained with this formalism are susceptible of numerical implementation as a Langevin process.
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
Status of the AFP project in the ATLAS experiment
Status of the AFP project in the ATLAS experiment is summarized. The AFP system is composed of a tracker to detect intact, diffractively scattered protons, and of a time-of-flight detector serving to suppress background from pile-up interactions. The whole system, located around 210 m from the main ATLAS detector, is placed in Roman Pots which move detectors from and to the incident proton beams. A typical distance of the closest approach of the tracker to these beams is 2–3 mm. The main physics motivation lies in measuring diffractive processes in runs with not a very high amount of pile-up.
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
Probing GPDs in ultraperipheral collisions
Ultraperipheral collisions in hadron colliders give new opportunities to investigate the hadron structure through exclusive photoproduction processes. We describe the possibility of measuring the Generalized Parton Distributions in the Timelike Compton Scattering process and in the production of heavy vector meson.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Ultra-peripheral heavy-ion collisions with CMS
Ultra-peripheral collisions (UPCs) of heavy ions involve long range electromagnetic interactions at impact parameters larger than twice the nuclear radius. At TeV energies, the strong electromagnetic field due to the coherent action of the Z = 82 proton charges generates a large flux of photons, which can be used for high-energy photoproduction studies. Heavy vector mesons produced in electromagnetic interactions provide direct information on the parton distribution functions in the nucleus at very low values of Bjorken-x. These events are characterized by a very low hadron multiplicity. The wide pseudo-rapidity coverage of the CMS detectors is used to separate such events from very peripheral nuclear interactions. The CMS experiment has excellent capabilities for the measurement of the heavy vector mesons in the dimuon decay channel using the tracker and the muon chambers. This analysis demonstrates CMS’s capabilities for measuring J/ψ and the two-photon process in ultra-peripheral collisions, using the 2011 PbPb and 2013 pPb data. The prospects for future measurements using the data to be collected in the 2015 PbPb run will be described.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗