Search

Your search keyword '"Service de Métrologie Nucléaire"' showing total 2 results
Start Over Author "Service de Métrologie Nucléaire" Topic atomic physics
2 results on '"Service de Métrologie Nucléaire"'

1. Influence on the secondary electron yield of the space charge induced in an insulating target by an electron beam

Author

Raphaël Renoud, Sophie Bartholome, Alain Dubus, J.-P. Ganachaud, C. Attard, Institut de Recherche en Electrotechnique et Electronique de Nantes Atlantique EA4642 (IREENA), Institut Universitaire de Technologie Saint-Nazaire (IUT Saint-Nazaire), Université de Nantes (UN)-Université de Nantes (UN)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Institut Universitaire de Technologie - La Roche-sur-Yon (IUT La Roche-sur-Yon), Université de Nantes (UN)-Université de Nantes (UN), Service de Métrologie Nucléaire (CP165/84), and Université libre de Bruxelles (ULB)

Subjects
[PHYS]Physics [physics], 010302 applied physics, Yield (engineering), Chemistry, Electron multiplier, 02 engineering and technology, Electron, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Ring (chemistry), 01 natural sciences, Space charge, Secondary electrons, [SPI.MAT]Engineering Sciences [physics]/Materials, [SPI]Engineering Sciences [physics], 0103 physical sciences, Cathode ray, General Materials Science, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Atomic physics, 0210 nano-technology, Electron bombardment
Abstract

International audience; The building up of the space charge induced by electron bombardment in an insulating target is due to the stabilization of self-trapped electrons and holes in polaronic traps. For the energies considered, the target charges positively and the secondary electrons emitted at low energies can be attracted back to the surface. This results in a self-regulation effect where the total secondary yield tends to unity and the surface potential stabilizes at a low positive value. This conclusion is checked for various experimental conditions. The electrons landing on the target form a ring of negative charges that progressively spread out on the surface of the sample.

Published
1998
Full Text
View/download PDF

2. Experimental and theoretical study of the ratio between the electron emission yield and the electronic stopping power for protons incident on thin carbon foils

Author

Alain Dubus, Michael Beuve, M. Rösler, Nicolas Pauly, Alexander Clouvas, M. Caron, Benoit Gervais, Hermann Rothard, Constantinos Potiriadis, Service de Métrologie Nucléaire (CP165/84), Université libre de Bruxelles (ULB), Hahn-Meitner-Institut, Centre Interdisciplinaire de Recherche Ions Lasers (CIRIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Department of Electrical and Computer Engineering, Aristotelian University, Greek Atomic Energy Commission, Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), and Greek Atomic Energy Commission (EEAE)

Subjects
010506 paleontology, Nuclear and High Energy Physics, Range (particle radiation), chemistry.chemical_element, Electron, Kinetic energy, Proton energy, 7. Clean energy, 01 natural sciences, Ion, chemistry, Yield (chemistry), 0103 physical sciences, Stopping power (particle radiation), Atomic physics, 010306 general physics, Instrumentation, Carbon, 0105 earth and related environmental sciences
Abstract

International audience; It is often assumed that the kinetic electron emission yield γ is proportional to the electronic stopping power dE/dx for ions incident on solid targets. Though these two phenomena are based on the same physical process in which the incident ions lose their energy in the target in electron excitations, there is no reason why the ratio Λ=γ/(dE/dx) should be constant. We present in this paper a comparison between experimental and theoretical results for protons incident on thin carbon foils in a wide energy range (200 keV-9.2 MeV). The ratios ΛB=γB/(dE/dx) and ΛF=γF/(dE/dx) for both the backward (B) and forward (F) emission yields are studied as a function of the incident proton energy as well as the target thickness.

Published
2002
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results