High-energy photon interactions are discussed in terms of the hadronic structure of the photon, which is expressed by means of a formulation which is akin to, but somewhat more general than, vector-meson-dominance or specific generalized vector-dominance models. Experiments which demonstrate and yield information about this hadronic structure are discussed critically, and the resulting information is carefully evaluated. Special attention is paid to diffractive processes such as the photoproduction of vector mesons and to photon shadowing effects on nuclei. Relationships to other views of photon interactions, such as the parton model and the space-time description, are also discussed; these views are seen to complement the hadronic structure picture rather than to be in conflict. The general overview is that there is ample evidence which shows that the photon's hadronic structure plays a significant role in its interactions. What further work would most significantly enhance the understanding of the hadronic structure of the photon is also pointed out.

The Hadronic Properties of the Photon in High-Energy Interactions

Review of experimental techniques for high rate deformation and shock studies

https://digital.csic.es/bitstream/10261/249362/1/Dark%20energy.pdf

Dark energy and dust matter phases from an exact f (R)-cosmology model

Wiggler and undulator magnets - a review

To scientists using vacuum ultraviolet and x rays the most important characteristics of an ideal radiation source would be a high intensity within a small solid angle and a high intensity within a small wavelength interval, both extending over a broad range of wavelengths. High spatial brightness (large flux within a small solid angle) permits the delivery of a large number of photons per second to a small sample. High spectral brightness (large flux within a narrow wavelength interval) is essential for high‐resolution spectroscopy. A high‐power tunable vuv and x‐ray laser would be ideal, but unfortunately such a laser does not yet exist. Conventional vuv sources (such as gas‐discharge lamps) and x‐ray sources (such as electron‐impact x‐ray tubes) can produce a large flux of radiation, most of which is indeed within a narrow bandwidth at particular fluorescent lines. However, the flux is diffused over a large solid angle and the wavelength is fixed. The continuum radiation from these sources is less inten...

/pdf/wiggler-and-undulator-magnets-4fls7ec799.pdf

Wiggler and Undulator Magnets

The Adone Wiggler facility

Two-beam operation of the 1.5 GeV electron-positron storage ring adone

DAPHNE, the Frascati Phi-factory

The LELA undulator

A 1.9 Tesla, 6 full poles wiggler magnet, decreasing the critical wavelength of synchrotron radiation in Adone from 8.3 A to 4.4 A has been built in the Frascati National Laboratories. The results of the first measurements are presented.

Status Report on the Wiggler Magnet for Adone

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