Recent and future high energy experiments on QED nonlinear effects

A short review of the experiments on photon elastic scattering and splitting on Coulomb field of nuclei as well as on multiphoton Compton scattering and Breit-Wheeler pair production in strong electromagnetic field is given. Possible new QED nonlinear experiments are discussed

High energy experimental proposals for the study of UNRUH (effect) radiation

After a short discussion on the physics of the Unruh effect, Hawking, Larmor and Unruh radiations we consider some experiments proposed up to 2008, which can be carried out with the help of high energy electron and optical or X-ray photon beams.Кратко обсудив физику эффекта Унру, излучения Хокинга, Лармора и Унру, мы рассматриваем некоторые из экспериментов, предложенных к 2008 году, которые могут быть проведены с помощью высокоэнергетичных пучков электронов и оптических либо рентгеновских фотонов.Після короткого обговорення фізики ефекту Унру, випромінювання Хокинга, Лармора та Унру, ми розглядаємо деякі з експериментів, що були запропоновані до 2008 року, які можуть бути проведені за допомогою високоенергетичних пучків електронів та оптичних або рентгенівських фотонів

Proposals for the study of UNRUH (effect) radiation with the help of entangled photons produced in electron-photon collisions

We consider some experiments proposed after 2006, which can be carried out with the help of high energy electron and powerful laser or X-ray photon beams.Мы рассматриваем некоторые из экспериментов, предложенных позднее 2006 года, которые могут быть проведены с помощью высокоэнергетичных пучков электронов и мощных лазерных либо рентгеновских фотонов.Ми розглядаємо деякі з експериментів, що були запропоновані після 2006 року, які можуть бути проведені за допомогою високоенергетичних пучків електронів та потужних лазерних або рентгенівських фотонів

Charge Asymmetry in 1-1000 GeV Electromagnetic Showers and Possibility of Its Measurementnt

For the high energy electromagnetic showers the thickness dependence of a) the development of electron and positron components, b) the difference between the secondary electron and positron numbers, c) the charge asymmetry of high energy electromagnetic showers, as well as d) the spectral distributions of the components at the shower maxima for various energies of primary particle energies,1 - 1000 GeV were investigated employing GEANT Monte Carlo simulation package. Using these simulation results it is discussed the possibility of observation and study of the charge asymmetry with the help of a magnetic spectrometer which is important for the current and future experiments on the detection of radiowaves produced by high energy neutrinos.Comment: TEX file and 4 figure

Improved Crystal Method for Photon Beam Linear Polarization Measurement at High Energies

A method for photon linear polarization determination based on the measurement of the asymmetry of pairs produced by polarized photons in single crystals within the optimal intervals of pair particles energies is proposed. In difference to the well known methods the asymmetry in this case is essentially larger. The optimal orientation of crystal is found which provides the maximal values for analyzing power and figure of merit as well as minimal measurement time.Comment: 8 pages, 5 figure

GENERATION AND DETECTION OF THE POLARIZATION OF MULTI-GEV PHOTONS BY USE OF TWO DIAMOND CRYSTALS

Abstract Presented are experimental results for the difference in pair production probability (the asymmetry) for 5–150 GeV photons polarized parallel and perpendicular to a (110) plane in a 1.5 mm thick diamond 〈100〉 crystal. The photons are produced by interaction of 150 GeV electrons with an aligned diamond 〈100〉 crystal of 0.5 mm thickness. A significant asymmetry is found over the whole energy range, which corresponds to a high degree of linear polarization of the photons as well as a difference in the refractive index. This proof-of-principle result gives the possibility of producing high energy photons with circular polarization by use of a crystal. This might open for several opportunities in high energy physics like for instance the investigation of the contribution of the gluons to the spin of the nucleon

Carbon nanotubes and fullerites in high-energy and x-ray physics

ThéorieIt is demonstrated that the unique structures of carbon nantotubes and single-crystals of $C-{60}$ fullerenes may have application to X-ray, neutron and high-energy particle physics, based on channeling, Bragg diffraction and coherent radiation. These are reviewed, pointing out the peculiarites and advantages of nanocrystals compared to ordinary crystals. New applications are explored: X-rays and neutron channeling, undulator radiation in periodically bent nanotubes, "channeled" transition radiation. Quantum and classical channeling, channeling in bent nanocrystals, Bragg scattering of x-rays and neutrons, channeling radiation, coherent bremsstrahlung, parametric x-ray and nanotube undulator radiation are particularly studied using both analytical and Monte-Carlo methods. Continuous potentials, electron densities, transverse energy levels, and spectra of various types of coherent radiation are calculated. Large dechanneling lengths of positive particles, bending efficiencies, reflecting coefficients of solft x-rays and PXR yields are predicted. Principles of particle detectors using photo and secondary electron emissions are discussed