219 research outputs found
Two-body and three-body mesonic bound states in ultradense plasmas of fusion catalysis concern
Atomic and molecular recombination of
negatively charged mesons in warm dense
matter (WDM) and fast ignition (FIS)
ultradense plasmas, on low lying bound states
is demonstrated, as well as a former
conjecture about the negligibility of meson
sticking on fusion produced α particles..
Two-body and three-body mesonic bound states in ultradense plasmas of fusion catalysis concern
Atomic and molecular recombination of
negatively charged mesons in warm dense
matter (WDM) and fast ignition (FIS)
ultradense plasmas, on low lying bound states
is demonstrated, as well as a former
conjecture about the negligibility of meson
sticking on fusion produced α particles..
PW-laser produced MeV proton beams stopped in WDM plasmas (H, He, Ar, N, Xe)
Physical processes involved in the interaction
of ion beams in Warm Dense Matter (WDM)
(i.e. 1-100 eV. 0.01-100 g/cc) is fundamental to
the understanding of condensed matter, solidstate
physics, fusion sciences, and astrophysical
phenomena..
Stopping Power of Ions in a Magnetized Plasma: Binary Collision Formulatio
In this chapter, we investigate the stopping power of an ion in a magnetized electron plasma in a model of binary collisions (BCs) between ions and magnetized electrons, in which the two-body interaction is treated up to the second order as a perturbation to the helical motion of the electrons. This improved BC theory is uniformly valid for any strength of the magnetic field and is derived for two-body forces which are treated in Fourier space without specifying the interaction potential. The stopping power is explicitly calculated for a regularized and screened potential which is both of finite range and less singular than the Coulomb interaction at the origin. Closed expressions for the stopping power are derived for monoenergetic electrons, which are then folded with an isotropic Maxwell velocity distribution of the electrons. The accuracy and validity of the present model have been studied by comparisons with the classical trajectory Monte Carlo numerical simulations
Quantum-corrected Hybrid Bohm and Classical Diffusion in a Laser-driven Plasma
Within the framework of the hydrodynamic guidingcenter
approximation, we have investigated such quantum effects as the diffraction correction and the symmetry effect on the classical version of the particle diffusion coefficient D(1) across a dc magnetic field through the temperature-dependent pseudo-potentials. Analytic results are explicitly given with recourse to the order-of-magnitude estimate of a set of parameters pertaining to a laser-driven plasma
Science communication for resilient cities: monitoring digital communication to be weather-ready
International audienceThe quality of science and technology communication has become more challenging due to the fact that access to information has hugely increased in terms of variety and quantity. This is a consequence of different factors, among others the development of public relations by research institutes and the pervasive role of digital media (Bucchi 2013; Trench 2008). A key question is how can we objectively assess science and technology communication? Relatively few studies have been dedicated to the definition of pertinent indicators and (Neresini and Bucchi 2011). This research aims to understand how communication strategies, addressed to the general public, can optimise the impact of research findings in hydrology for resilient cities and how this can be assessed. Indeed urban resilience to extreme weather events relies both on engineering solutions and increased awareness of urban communities as it was highlighted by the FP7 SMARTesT project and the experiences carried out in the framework of TOMACS (Tokyo Metropolitan Area Convective Studies for Resilient Cities) and CASA (Engineering Research Center for Collaborative Adaptative Sensing of the Atmosphere, supported by the U.S. National Science Foundation). The research will greatly benefit from the development of automated analysis of unstructured Big Data that allows the exploration of huge amounts of digital communication data: blogs, social networks postings, press articles... Furthermore, these techniques facilitate the comparison of socioeconomic trends with physical-environmental trends. We will also investigate case studies corresponding to several research projects under the umbrella of the Chair " Hydrology for resilient cities " : for example the Interreg NWE IVB RAINGAIN project, the KIC Climate Blue Green Dream project and worldwide collaborations such as TOMACS. All these projects involve awareness raising and capacity building activities aimed to stimulate cooperation between scientists, professionals (e.g. water managers, urban planners) and beneficiaries (e.g. concerned citizens, policy makers)
Plasmas and Controlled Nuclear Fusion
Contains reports on one research project.U. S. Atomic Energy Commission (Contract AT(11-1)-3070
Rainwater harvesting to control stormwater runoff in suburban areas. An experimental case-study
International audienceOn a 23 ha urban watershed, 10 km East of Paris, rainwater tanks have been installed on 1/3 of the private parcels to prevent stormwater sewer overflows. This paper investigates the macroscopic effect of rainwater harvesting on runoff, and thus the potential of this technique for stormwater source control. The analysis is performed using the SWMM 5 model, calibrated on rainfall- runoff measures from two measurement campaigns, before and after the equipment. The availability of two data-sets allows to point out changes in the catchment's behaviour. The main findings are that: (1) catchment's evolution, mainly caused by individual land-cover modifications, produces non-stationarity of the hydrologic behaviour; (2) the rainwater tanks installed, although they affect the catchment hydrology for usual rain events, are too small and too few to prevent sewer overflows in case of heavy rain events
A number-conserving linear response study of low-velocity ion stopping in a collisional magnetized classical plasma
The results of a theoretical investigation on the low-velocity stopping power
of the ions moving in a magnetized collisional plasma are presented. The
stopping power for an ion is calculated employing linear response theory using
the dielectric function approach. The collisions, which leads to a damping of
the excitations in the plasma, is taken into account through a
number-conserving relaxation time approximation in the linear response
function. In order to highlight the effects of collisions and magnetic field we
present a comparison of our analytical and numerical results obtained for a
nonzero damping or magnetic field with those for a vanishing damping or
magnetic field. It is shown that the collisions remove the anomalous friction
obtained previously [Nersisyan et al., Phys. Rev. E 61, 7022 (2000)] for the
collisionless magnetized plasmas at low ion velocities. One of major objectives
of this study is to compare and contrast our theoretical results with those
obtained through a novel diffusion formulation based on Dufty-Berkovsky
relation evaluated in magnetized one-component plasma models framed on target
ions and electrons.Comment: Submitted to Phys. Rev. E, 17 pages, 4 figure
- …