Ecological and biological features of phacelia tanacetifolia benth. in various ecotopes of Southern European Russia

The article contains the results of the study of the environmental and biological features of Ph. tanacetifolia in four natural and territorial complexes of the Belgorod region. In all natural-territorial complexes Ph. tanacetifolia accompanied by dominant species such as: M. albus Medik., Ch. album L., E. canadensis L., E. repens (L.) Nevski, S. pumila (Poir.) Roem. & Schult., C. xanthiifolia (Nutt.

Spectra of Coherent Smith-Purcell Radiation Observed from Short Electron Bunches: Numerical and Experimental Studies

MOPWA056 - ISBN978-3-95450-122-9International audienceThere is a significant interest in the development of compact particle accelerators within research areas including X-ray and THz (T-ray) sources of radiation, particle physics and medical sciences. To support the progress in these areas, non-invasive, electron beam diagnostics that are capable of measuring a single femtosecond electron bunch are required. At the current stage such beam diagnostics for femtosecond-long electron bunches are still not available. The goal of the work presented is to understand the spectral characteristics of coherent Smith-Purcell radiation to enable its quick and reliable interpretation including the longitudinal profile reconstruction of electron bunches. The research presented comprises results from numerical modelling and experimental studies. Using the numerical data, we discuss the radiated spectra dependence on the electron bunch profile and analyse the results. We also discuss the experimental data and compare it with theoretical predictions

Experimental observation of superradiance in millimeter-wave band

The first experimental results of the observation of superradiance from a single subnanosecond electron bunch are presented. Superradiance was associated with different varieties of stimulated emission (bremstruhlung, cyclotron, Cherenkov, etc). Unique megawatt power level microwave pulses of short duration (0.3-0.5 ns) have been obtained

Longitudinal Profile Monitor Using Smith-Purcell Radiation: Recent Results from the E-203 Collaboration

TUPC38 - Work supported by seed funding from the John Fell Fund, University of Oxford, Université Paris-Sud, program "Attractivité" and by the ANR under contract ANR-12-JS05-0003-01International audienceWe report on recent measurements made at FACET by the E-203 collaboration to test a longitudinal bunch profile monitor based on Coherent Smith-Purcell radiation. The capacity of this monitor to resolve sub-picosecond bunches will be shown as well as a comparison of profile reconstructed for different beam compression settings. We will also present recent electromagnetic simulations of the interactions between the beam and the grating as well as the expected resolution of such monitor. Comparison between Coherent Smith-Purcell radiation measurement and those made with other techniques will also be discussed. Finally future upgrades of the experiment and steps toward the construction of a single shot longitudinal profile monitor will be presented

Development of amendments for rehabilitation of soils, contaminated by radionuclides, and assessment of their application efficacy

Sapropels, hydrolyzed lignin (HL), clay-salt slimes (CSS) and phosphogypsum (PG) have been used as components to develop efficacious and ecologically safe amendments. Methods and models for forecasting effectiveness of countermeasures based on application of such amendments have been proposed. It has been found that 137Cs selective sorption on organo-mineral amendments is enhanced after incubation, as compared with the calculated values on the basis of the fractions of total mass of source components and their own ability for 137Cs selective sorption. The measured RIP(K) value for the mixtures of soddy-gley soil and organo-mineral amendment at 2% was 1.2–1.6 higher than the calculated one, and at 10% 1.5–1.7 times higher than the calculated