Search results for "Lait"
showing 10 items of 683 documents
Analysis of the Photoneutron Field Near the THz Dump of the CLEAR Accelerator at CERN With SEU Measurements and Simulations
2022
We study the radiation environment near the terahertz (THz) dump of the CERN Linear Electron Accelerator for Research (CLEAR) electron accelerator at CERN, using FLUktuierende KAskade in German (FLUKA) simulations and single-event upset (SEU) measurements taken with 32-Mbit Integrated Silicon Solution Inc. (ISSI) static random access memories (SRAMs). The main focus is on the characterization of the neutron field to evaluate its suitability for radiation tests of electronics in comparison with other irradiation facilities. Neutrons at CLEAR are produced via photonuclear reactions, mostly initiated by photons from the electromagnetic cascades that occur when the beam is absorbed by the dump …
First Offline Results from the S3 Low-Energy Branch
2022
International audience; We present the first results obtained from the S3 Low-Energy Branch , the gas cell setup at SPIRAL2-GANIL, which will be installed behind the S3 spectrometer for atomic and nuclear spectroscopy studies of exotic nuclei. The installation is currently being commissioned offline, with the aim to establish optimum conditions for the operation of the radio frequency quadrupole ion guides, mass separation and ion bunching, providing high-efficiency and low-energy spatial spread for the isotopes of interest. Transmission and mass-resolving power measurements are presented for the different components of the S3-LEB setup. In addition, a single-longitudinal-mode, injection-lo…
An innovative Superconducting Recoil Separator for HIE-ISOLDE
2023
International audience; The ISOLDE Scientific Infrastructure at CERN offers a unique range of post-accelerated radioactive beams. The scientific program can be improved with the “Isolde Superconducting Recoil Separator” (ISRS), an innovative spectrometer able to deliver unprecedented (A, Z) resolution. In this paper we present an overview of the physics and ongoing technical developments.
A compact linear Paul trap cooler buncher for CRIS
2020
A gas-filled linear Paul trap for the Collinear Resonance Ionisation Spectroscopy (CRIS) experiment at ISOLDE, CERN is currently under development. The trap is designed to accept beam from both ISOLDE target stations and the CRIS stable ion source. The motivation for the project along with the current design, simulations and future plans, will be outlined. peerReviewed
Phase-Imaging Ion-Cyclotron-Resonance technique at the JYFLTRAP double Penning trap mass spectrometer
2018
The Phase-Imaging Ion-Cyclotron-Resonance (PI-ICR) technique has been commissioned at the JYFLTRAP double Penning trap mass spectrometer. This technique is based on projecting the ion motion in the Penning trap onto a position-sensitive multichannel-plate ion detector. Mass measurements of stable 85 Rb $ ^{+}$ and 87 Rb $ ^{+}$ ions with well-known mass values show that relative uncertainties $ \Delta m/m \leq 7\cdot 10^{-10}$ are possible to reach with the PI-ICR technique at JYFLTRAP. The significant improvement both in resolving power and in precision compared to the conventional Time-of-Flight Ion Cyclotron Resonance technique will enable measurements of close-lying isomeric states and …
Benchmark of a multi-physics Monte Carlo simulation of an ionguide for neutron-induced fission products
2022
AbstractTo enhance the production of medium-heavy, neutron-rich nuclei, and to facilitate measurements of independent yields of neutron-induced fission, a proton-to-neutron converter and a dedicated ion guide for neutron-induced fission have been developed for the IGISOL facility at the University of Jyväskylä. The ion guide holds the fissionable targets, and the fission products emerging from the targets are collected in helium gas and transported to the downstream experimental stations. A computer model, based on a combination of MCNPX for modeling the neutron production, the fission code GEF, and GEANT4 for the transport of the fission products, was developed. The model will be used to i…
Mass Analyzing Recoil Apparatus, MARA
2019
An in-flight zero-angle mass separator, MARA, has been recently constructed and commissioned at the University of Jyväskylä, Finland. MARA is a double focusing device, consisting of a quadrupole driplet, electrostatic deflector, and magnetic dipole. This separator is built for nuclear structure studies to be performed around the N∼Z line and at beyond the proton drip line. peerReviewed
BEM-Based Magnetic Field Reconstruction by Ensemble Kálmán Filtering
2022
Abstract Magnetic fields generated by normal or superconducting electromagnets are used to guide and focus particle beams in storage rings, synchrotron light sources, mass spectrometers, and beamlines for radiotherapy. The accurate determination of the magnetic field by measurement is critical for the prediction of the particle beam trajectory and hence the design of the accelerator complex. In this context, state-of-the-art numerical field computation makes use of boundary-element methods (BEM) to express the magnetic field. This enables the accurate computation of higher-order partial derivatives and local expansions of magnetic potentials used in efficient numerical codes for particle tr…
P231: Déterminants socioculturels de l’initiation et de la durée d’allaitement en France : premiers résultats de l’étude nationale ELFE
2014
Introduction et but de l’etude Le lait maternel est la source d’alimentation la plus adequate pour les nourrissons pendant les 1ers mois de vie. L’Organisation Mondiale de la Sante (OMS) preconise un allaitement maternel exclusif jusqu’a 6 mois, puis un allaitement partiel complete avec des aliments de diversification adaptes jusqu’a 2 ans1. En France, la derniere enquete nationale perinatale, realisee en 2010, a revele que, malgre les recommandations de l’OMS, le taux d’allaitement a la naissance etait de 60 %2. Recemment, l’etude EPIFANE a indique que le taux d’allaitement diminuait a 35 % a 1 mois post-partum3. Il a ete mis en evidence que des facteurs demographiques et socioculturels po…
3D-grafiikan optimointi mobiilialustalle Unity-ympäristössä
2016
Mobiilimarkkinoilta löytyy hyvin laaja kirjo erilaisia mobiilipelejä. Mobiililaitteet ovat laajimmalle levinnyt tietokonemuoto. Viimevuosina mobiililaitteiden graafiset ominaisuudet ovat nousseet sellaiselle tasolle, että niillä voidaan renderöidä upeita 3Dympäristöjä reaaliajassa. Silti mobiililaitteet vaativat optimointia sulavaan peligrafiikan laskemiseen. Tämä pro gradu tutkielma paneutuu 3D-mobiiligrafiikan optimointiin keskittyen Unity-pelimoottoriin. Teoriaosuudessa käydään läpi 3D-grafiikan luomisen peruskäytänteitä siirtyen Unityn käyttämään OpenGL ES liukuhihnaan ja sen optimointimahdollisuuksiin. Käytännön osuudessa testataan kolmioiden, valaistuksen, sekä varjostimien vaikutusta…