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M. Sylvain Vanneste (Laboratoire de l'accélérateur Linéaire, groupe Cosmologie)28/05/2018 09:45
According to standard inflationary theories, the origin of cosmological structures is explained by a period of exponential expansion of the Universe induced by the potential of a scalar field and its quantum fluctuations. In addition to these primordial densities, inflation also predicts the existence of a primordial gravitational waves background. The imprint of which would be visible on the...
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Mme Angelique Lartaux (Vollard) (LAL / CNRS)28/05/2018 10:05
The first gravitational waves signal was detected on the 14th september 2015 by the LIGO observatories. Since then many other detections have been made and especially in August 2017 with the detection in coincidence on both LIGO and Virgo detectors of the coalescence of two neutron stars which position in the sky was precise enough to identify the galaxy host and electromagnetic counterpart....
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M. Ziwei Ou (IPN, Orsay)28/05/2018 10:25
One of the major scientific objectives of the future Cherenkov Telescope Array (CTA) Observatory is the discovery of PeVatrons, which are able to accelerate charged particle up to 1 PeV (10^15 eV). The determination of efficient criteria to identify PeVatron candidates during the observations is essential in order to trigger deeper observations. Here we use the simulated data, which call Data...
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M. Cloé Girard-Carillo28/05/2018 10:50Talk
In the Standard Model of particle physics (SM), the lepton sector is composed of massive charged particles (electron, muon and tau) and neutral particles, neutrinos, which are massless by construction.
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Nevertheless, observations of neutrino oscillations indicate that neutrinos are massive particles.
Given their neutral character, neutrinos can be either Dirac or Majorana particles.
Should... -
M. Antoine Laudrain (LAL-ATLAS)28/05/2018 11:45
The ATLAS electromagnectic calorimeter allows for a precise measurement of electron and photon energy produced during collisions at the LHC. To get an accurate measurement, the reconstructed energy is calibrated over several steps. One of these steps is the inter-calibration of the 3 layers of the calorimeter to correct for electronic cross-talk among cells and possible residual...
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M. Thibault Chevalérias (CEA Saclay)28/05/2018 12:05
The top quark is the heaviest elementary particle we know. Therefore, it may play a special role in the Standard Model of particle physics. Its Yukawa coupling to
the Higgs boson is close to one, which makes this particle a key element of many theories beyond the Standard Model.The Large Hadron Collider (LHC), located at CERN (Geneva, Switzerland) is a proton-proton collider with a...
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M. Vitalii Lisovskyi (LAL)28/05/2018 12:25
In the Standard Model of particle physics, couplings of gauge bosons to leptons of different flavors (electrons, muons and tau leptons) are believed to be identical. However, the recent measurements performed by LHCb Collaboration show hints for Lepton Flavor Universality violation: probabilities of B meson decaying to an (excited) kaon and two muons, and an (excited) kaon and two electrons,...
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M. Andrii Usachov (LAL)28/05/2018 12:45
Non Relativistic QCD (NRQCD) provides so far the most successful framework to describe the production of the $J^{PC}=1^{--}$ quarkonium states. However, a comprehensive description of the production and polarisation of the $J/\psi$ state at Tevatron and LHC in the complete $p_T$ and rapidity range remains a challenge. The heavy quark spin symmetry yields direct links between the long distance...
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M. Olivier Vasseur (CNRS - IPN Orsay)28/05/2018 14:30
Collective excitations are observed and analyzed in several many-body systems such as, for instance, atomic nuclei, trapped atomic gases or metallic clusters. A model which is widely used to describe collective excitations is the random-phase approximation (RPA), where the excited modes are superpositions of 1 particle-1 hole configurations only. The RPA allows in general for a satisfactory...
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M. Antoine Boulet (IPNO)28/05/2018 14:50
A density functional is proposed for Fermi systems with anomalously large s-wave scattering length that has no free parameters. The functional is designed to correctly reproduce the unitary limit in Fermi gases together with the leading-order contributions in the s-wave channel at low density. The functional reproduces well static properties of Fermi gas at or close to the unitary limit. By...
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28/05/2018 15:15Talk
Économiste, Directeur de l'Observatoire Français des Conjonctures Économiques (OFCE)
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29/05/2018 09:30
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M. Bingfeng LV29/05/2018 09:45
Evidence for chiral doublet bands has been observed for the first time in the even-even nucleus 136Nd. One chiral band was firmly established and four other candidates for chiral bands have been identified in 136Nd. These bands are interpreted as a multiple chiral doublet bands, which is good agreement with results of calculation based on the constrained and tilted axis cranking covariant...
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M. Etienne Dupont (CSNSM)29/05/2018 10:05
212Po has been studied since 19161 and there have been numerous attempts to give a microscopic description of its structure, but with only 4 nucleons more than the doubly-magic 208Pb nucleus, the 212Po structure is still not well understood. Since the use of shell-model configurations failed to reproduce the large alpha-decay rate of the ground state, it has been completed by an alpha-cluster...
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M. Tijani Id Barkach29/05/2018 10:25
The purpose of my PhD is to study the collision between hydrocarbon molecules and Helium atoms. The experiment had been done at IPNO with the ANDROMEDE accelerator thanks to the silicon mutidetector AGAT. This work relies on two fundamental studies. The frst one is the modelling of ion atom collision which allows us to predict the cross section of the collision. The second one is the...
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Mme Anne Meyer (IPN Orsay)29/05/2018 10:45
Classical novae outbursts are the third most energetic explosions in the Universe after gamma-ray bursts and supernovae. During this explosive burning, nucleosynthesis takes place and the newly synthesized material is ejected into the interstellar medium. In order to understand these objects, the study of presolar grains and γ-ray emitters are of specific interest since they can give direct...
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M. Junxu LU (IPNO)29/05/2018 11:40
The scattering processes of particles have always been one of the focus of attention. Since the fundamental theory for strong interaction, quantum chromodynamics (QCD), was proposed, people are always very curious and enthusiastic to figure out how particles interact, or in another word, scatter with each other in all energy sector. However, as is known to us all, one critical feature of QCD...
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Mme Amel Belounnas (PHEN)29/05/2018 12:00
Pion production in NN collisions is one of the sources of information on the NN interaction and on the contribution of nucleon resonances. In particular, two-pion production in the few energy range, carries information both on single and double baryon excitation and on $\pi\pi$ dynamics, which are also useful for the interpretation of dielectron production. Baryonic resonances indeed...
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M. Corentin Allaire (LAL)29/05/2018 12:20
The expected increase of the particle flux at the high luminosity phase of the LHC (HL-LHC) with instantaneous luminosities up to L ≃ 7.5 × 10^{34} cm^{−2} s^{−1} will have a severe impact on the ATLAS deetctor performance. The pile-up is expected to increase on average to 200 interactions per bunch crossing resulting in a vertex density that can be larger than 1.5 per mm.
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The reconstruction... -
Mme Chiara Amendola (Laboratoire Leprince-Ringuet, Ecole polytechnique)29/05/2018 12:40
The CMS experiment implements a sophisticated two-level triggering system composed of a Level-1 trigger, instrumented by custom-design hardware boards, and a software High-Level-Trigger. A new Level-1 trigger architecture with improved performance is now being used, allowing complex correlations to be computed online. The implementation of the first dedicated Vector Boson Fusion trigger...
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M. Dmytro Hohov (LAL Université Paris-Sud)29/05/2018 13:00
In the context of High Luminosity phase of LHC (Phase-2), envisaged to start in $\sim$2026, it's planned to increase the beam luminosity up to $7.5\cdot10^{34} cm^{-2}s^{-1}$ and collision energy up to 14 TeV in the center of mass to achieve the high-precision results in the project tasks. These conditions will lead to additional requirements especially on an inner part of the ATLAS detector...
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M. Oleksandr Hryhorenko (IPNO)29/05/2018 14:45Talk
Performances of superconducting accelerating cavities, in particular made of bulk Niobium, depend on the purity and crystallographic quality of the material exposed to an intense radio-frequency electromagnetic field. The preparation of the cavity walls has been and is still one of the major challenges in SRF accelerator technology. In order to avoid performance degradation, the damaged layer...
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M. Amin Ghaith (Synchrotron SOLEIL)29/05/2018 15:05Talk
The ERC Advanced Grant COXINEL aims at demonstrating free electron laser amplification, at a resonant wavelength of 200 nm, based on a laser plasma acceleration source. To achieve the amplification, a 8 m long dedicated transport line was designed to manipulate the beam qualities. It starts with a triplet of permanent magnet with tunable gradient quadrupoles (QUAPEVA) that handles the highly...
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Mme Aurore Dumancic (CEA Saclay/IRFU)29/05/2018 15:25Talk
The emittance is an essential feature to measure for an accelerator beam. It describes the behavior of the beam at each longitudinal position. For the time, the Alisson scanner is the most used system to qualify the emittance of a proton beam. However, this type of measurement has a default: it is a two-dimensions diagnostic. It means that it can only measure the position and angular...
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Mme Maria Barba29/05/2018 15:45Talk
Pulsating Heat Pipes (PHP) are two-phase heat transfer devices consisting of a long capillary tube bent into many U-turns connecting the cold source to the hot source. They are thermally driven by an oscillatory flow of liquid slugs and vapor plugs. Due to their lightness, simple configuration and thermal performance, PHP are excellent candidates to be used as thermal links between...
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Mme Marion Bricout (CEA Saclay)29/05/2018 16:15Poster
During in-reactor operation, the nuclear fuel is subjected to simultaneous radiation sources induced by the slowing down of fission fragments, the alpha and beta decay, etc. In addition, fission products incorporation induce chemical effects in the matrix. At the atomic scale radiation, damage is produced by both low-energy particles, leading to the collision cascades formation and high-energy...
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M. Edouard Lecoq (Institut d'Astrophysique Spatiale)29/05/2018 16:15Poster
Understanding the baryonic processes taking place in the large scale structures of the Universe is essential both if we want to understand structure formation and the biases they may induce in cosmological studies (e.g. σ8 or ωm). Among those processes, turbulent motions that are induced at various scales, for instance by AGN jets or accretion of matter from intergalactic filaments, are...
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M. Xin Jin (CSNSM, CNRS)29/05/2018 16:15Poster
Ion beams are currently used in numerous fields of material science. It is crucial to have powerful tools to characterize irradiated materials and to have a better understanding of the basic mechanisms of the ion/solid interactions through mastering the technical aspects of the use of ion beams.
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The aim of the thesis work is to develop new approaches that combine experimental characterization... -
Mykola Khandoga (CEA Saclay)29/05/2018 16:15Poster
The electromagnetic calorimeter is one of the key elements of the ATLAS detector at the Large Hadron Collider at CERN. In combination with the inner tracker the calorimeter allows to measure the energy and the momentum of electrons and photons coming out of the interaction point of the detector.
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In order to properly reconstruct the physical processes happening after the collision it is... -
M. Tim Schneider (IMNC - Université Paris-Sud)29/05/2018 16:15Poster
Minibeam radiation therapy (MBRT) is a promising cancer treatment method that can help increase the sparing of healthy tissue while simultaneously allowing for higher doses to be administered, thereby making new types of cancers (hypoxic tumors) accessible to this type of treatment. While MBRT with x-rays is already being put to use in hospitals, the advantages of irradiating with protons and...
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M. Patrick Knights (CEA Saclay/IRFU)29/05/2018 16:15Poster
The NEWS-G collaboration utilises the novel technology of the Spherical Proportional Counter (SPC) to conduct a direct search for low mass Dark Matter (DM) candidates. The SPC comprises a grounded metallic spherical vessel with a central spherical readout anode. In the ideal geometry, the radial electric field within the detector varies as 1/r$^{2}$, however, the details of the support...
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Mme Imen Zemzemi (Laboratoire Leprince-Ringuet)29/05/2018 16:15Poster
Les simulations Particle-in-Cell sont utilisées dans une large variété de problèmes liés à la physique des plasmas. Dans plusieurs cas, une description précise et fiable des effets cinétiques qui se produisent en 3D est requise. Néanmoins, ce type de simulations est très couteux et nécessite beaucoup de ressources de calcul. Ceci est principalement dû à la haute résolution que nécessite les...
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M. Driss Oumbarek Espinos (Synchrotron SOLEIL)29/05/2018 16:15Poster
Laser Plasma Acceleration (LPA) enables to generate up to several GeV electron beam with short bunch length and high peak current within centimeters scale via different schemes. However, the generated beam quality (energy spread, divergence) is not sufficient to drive a Free Electron Laser (FEL) and a beam control is required. The COXINEL manipulation line is composed of high gradient variable...
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Mme Tetiana Moskalets (CEA/IRFU/DPhP)29/05/2018 16:15Poster
The top quark mass ($m_t$) is a key parameter of the Standard Model (SM). Its large size, of the order of the electroweak scale, is associated with a Yukawa coupling of order 1, that gives important contributions, via radiative corrections, to SM observables. After the Higgs boson discovery and the accurate measurement of its mass, the allowed values of the W boson and top quark masses have...
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M. Florian Nortier (Laboratoire de Physique Théorique d'Orsay)29/05/2018 16:15Poster
In the Standard Model (SM) of Particle Physics, the electroweak (EW) symmetry breaking pattern is the less known and understood. With the discovery of a Higgs-like boson by the Large Hadron Collider (LHC) experiment in 2012, the Brout-Englert-Higgs (BEH) mechanism, which involves a new scalar field to break the EW gauge symmetry, seems to be at work in Nature. Nevertheless, the origin of the...
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M. Henri Kraft (IPNO DA)29/05/2018 16:15Poster
• Intro
- Intro sujet MYRRHA 600 MeV avec réacteur nucléaire
- Nécessité d’avoir un système fiable avec peu d’arrêt de fonctionnement
- Sûreté d’un pilotage par accélérateur, k$_{eff}$<1
• Dynamique faisceau
- Commissioning et test de fiabilité à 100 MeV
- Photo dynamique faisceau, photo quadupole, dipole
- Mon travail sur la définition du kicker-septum nécessaire et sur le design...
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M. Rémy Thoër29/05/2018 16:15Poster
Low temperature nuclear orientation (LTNO) allows to study polarized exotic nuclei. At very low temperature (~10mK) nuclei can experience a very high polarization in the hyperfine field which exists into a ferromagnetic metal host. The decay products can be observed using proton, alpha or beta-particle detectors fitted within the cryostat and/or external gamma or neutron detectors, providing a...
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Mme Suheyla Bilgen (LAL)29/05/2018 16:15Poster
The High Luminosity LHC (HL-LHC) is an upgrade of the LHC to achieve instantaneous luminosities a factor of five larger than the LHC nominal value. The Future Circular Collider (FCC) study is developing designs for a higher performance particle collider to extend the research currently being conducted by present colliders. For these two project, the investigation of beam interactions with the...
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Mme Julien Ripoche (CEA/DAM)29/05/2018 17:15
Methods to solve the N-body Schroedinger equation must cope with two specific attributes of inter-nucleon interactions that are responsible for the non-perturbative character of the nuclear many-body problem. These elements of non-perturbative physics are of ultra-violet and infra-red natures and can be tamed down by pre-processing the nuclear Hamiltonian via Similarity Renormalization Group...
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M. Martin Owusu-Mensah (CSNSM, Univ Paris-Sud, CNRS/IN2P3, Paris-Saclay, Orsay, France)29/05/2018 17:40Talk
Oxide dispersion strengthened (ODS) ferritic/ martensitic FeCr steels are reinforced by dense and stable metallic (Y,Ti) nano-oxide particles. These ODS steels are known to have very good creep and radiation resistance as well as improved mechanical properties at high temperatures, making them ideal candidates to be used as structural materials for future generation IV (Gen IV) fission and...
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Mme Olga Emelianova (CSNSM, Univ Paris-Sud, Univ Paris-Saclay)29/05/2018 18:00Talk
In spite of intensive international research on Oxide Dispersed Strengthened (ODS) steels in the last decade, many fundamental issues concerning modification of steel properties under fusion environment are still under debate. The main objective of this research project is to demonstrate the role of the different microstructural components in radiation resistance of ODS steel under high...
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Mme Coralie Luchini (IPN Orsay, CEA DAM)29/05/2018 18:25Talk
Protactinium, as a $^{235}$U decay product, is naturally present in the environment as $^{231}$Pa isotope (alpha emitter with a half-life of 32,400 years). Over the years, this isotope is accumulated in uranium tailings and stocks of yellow cake. Modelling the behavior of this element in the geosphere requires thermodynamic and structural data relevant to environmental conditions. The present...
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Mme Carlotta Trigila (University Paris Sud, IMNC)29/05/2018 18:50Talk
Targeted radionuclide therapy is the most used treatment modality against malign and benign diseases of thyroid. The large heterogeneity of therapeutic doses in patients and the range of effects observed state that an individualized dosimetry is essential for optimizing this therapy. The goal of the project is to strengthen the control of the doses delivered to thyroid during treatment of...
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Mme Imene Belahcene (LAL)29/05/2018 19:15
Cosmic strings are topological defects which can be formed in GUT-scale phase transitions in
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the early universe. They are also predicted to form in the context of string theory. I will present the analysis conducted to specifically search for gravitational-wave bursts from cosmic string loops in the data of Advanced LIGO 2015-2016 observing run (O1).
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