Physics Procedia最新文献_第9页

Considerations on the construction of a Powder Bed Fusion platform for Additive Manufacturing 构建增材制造粉末床融合平台的思考

Physics Procedia Pub Date : 2017-01-01 DOI: 10.1016/j.phpro.2017.08.004

Sebastian Aagaard Andersen, Karl-Emil Nielsen, David Bue Pedersen, Jakob Skov Nielsen

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引用次数: 2

Modeling Optical Low-threshold Exciton Nonlinearity in Dielectric Nanocomposites 介质纳米复合材料中光学低阈值激子非线性的建模

Physics Procedia Pub Date : 2017-01-01 DOI: 10.1016/j.phpro.2017.01.010

D.V. Storozhenko , V.P. Dzyuba , Y.N. Kulchin , A.V. Amosov

引用次数: 1

Geant4 Modifications for Accurate Fission Simulations 精确裂变模拟的Geant4修正

Physics Procedia Pub Date : 2017-01-01 DOI: 10.1016/j.phpro.2017.09.005

Jiawei Tan, Joseph Bendahan

{"title":"Geant4 Modifications for Accurate Fission Simulations","authors":"Jiawei Tan, Joseph Bendahan","doi":"10.1016/j.phpro.2017.09.005","DOIUrl":"10.1016/j.phpro.2017.09.005","url":null,"abstract":"<div><p>Monte Carlo is one of the methods to simulate the generation and transport of radiation through matter. The most widely used radiation simulation codes are MCNP and Geant4. The simulation of fission production and transport by MCNP has been thoroughly benchmarked. There is an increasing number of users that prefer using Geant4 due to the flexibility of adding features. However, it has been found that Geant4 does not have the proper fission-production cross sections and does not produce the correct fission products. To achieve accurate results for studies in fissionable material applications, Geant4 was modified to correct these inaccuracies and to add new capabilities. The fission model developed by the Lawrence Livermore National Laboratory was integrated into the neutron-fission modeling package. The photofission simulation capability was enabled using the same neutron-fission library under the assumption that nuclei fission in the same way, independent of the excitation source. The modified fission code provides the correct multiplicity of prompt neutrons and gamma rays, and produces delayed gamma rays and neutrons with time and energy dependencies that are consistent with ENDF/B-VII. The delayed neutrons are now directly produced by a custom package that bypasses the fragment cascade model. The modifications were made for U-235, U-238 and Pu-239 isotopes; however, the new framework allows adding new isotopes easily. The SLAC nuclear data library is used for simulation of isotopes with an atomic number above 92 because it is not available in Geant4. Results of the modified Geant4.10.1 package of neutron-fission and photofission for prompt and delayed radiation are compared with ENDFB-VII and with results produced with the original package.</p></div>","PeriodicalId":20407,"journal":{"name":"Physics Procedia","volume":"90 ","pages":"Pages 256-265"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.phpro.2017.09.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83816290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Photoluminescence and Low-threshold Nonlinear Optical Properties of SiO2 Nanoparticles 二氧化硅纳米颗粒的光致发光和低阈值非线性光学性质

Physics Procedia Pub Date : 2017-01-01 DOI: 10.1016/j.phpro.2017.01.021

A.V. Amosov , V.P. Dzyuba , Yu.N. Kulchin , D.V. Storozhenko

引用次数: 4

Which Resolution can be Achieved in Practice in Neutron Imaging Experiments? – A General View and Application on the Zr - ZrH2 and ZrO2 - ZrN Systems 中子成像实验在实际中可达到何种分辨率?- Zr - ZrH 2和ZrO 2 - ZrN体系的概论与应用

Physics Procedia Pub Date : 2017-01-01 DOI: 10.1016/j.phpro.2017.06.037

Mirco Grosse , Nikolay Kardjilov

引用次数: 6

Neutron Imager with Micro Channel Plates (MCP) in Electrostatic Mirror Configuration: First Experimental Test 带微通道板(MCP)的中子成像仪静电镜结构:第一次实验测试

Physics Procedia Pub Date : 2017-01-01 DOI: 10.1016/j.phpro.2017.09.020

V. Variale , B. Skarbo

引用次数: 1

Pulsed Neutron Imaging for Non-destructive Testing using Simulated Nuclear Fuel Samples 用模拟核燃料样品进行无损检测的脉冲中子成像

Physics Procedia Pub Date : 2017-01-01 DOI: 10.1016/j.phpro.2017.06.011

Daisuke Ito , Tadafumi Sano , Jun-ichi Hori , Yoshiyuki Takahashi , Hiroyuki Hasemi , Takashi Kamiyama , Ken Nakajima

{"title":"Pulsed Neutron Imaging for Non-destructive Testing using Simulated Nuclear Fuel Samples","authors":"Daisuke Ito , Tadafumi Sano , Jun-ichi Hori , Yoshiyuki Takahashi , Hiroyuki Hasemi , Takashi Kamiyama , Ken Nakajima","doi":"10.1016/j.phpro.2017.06.011","DOIUrl":"10.1016/j.phpro.2017.06.011","url":null,"abstract":"<div><p>An integrated assessment method for a nuclear fuel with high decay heat and high radioactivity is required to establish fast reactor system with Trans-Uranium (TRU) fuel containing minor actinides. In addition, a Pu quantitation method with rapidity and accuracy is also necessary in a viewpoint of nuclear security. For these demands, a quantitative evaluation technique for nuclei concentration, thermal property and physical information of such fuel has to be developed. The present study focuses on the non-destructive imaging using pulsed neutrons. Experiments are carried out at Hokkaido University Neutron Source (HUNS) and a gas electron multiplier (GEM) is applied to obtain 2-D information of time-of-flight (TOF). To simulate a nuclear fuel pellet, a sample with equivalent thermal neutron cross-section to the enriched uranium fuel is prepared and the transmitted images of the simulated sample are acquired. Furthermore, a small piece of In, which simulates the Pu spot in the actual fuel, is inserted into the sample and the detectability of the small spot is discussed.</p></div>","PeriodicalId":20407,"journal":{"name":"Physics Procedia","volume":"88 ","pages":"Pages 89-94"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.phpro.2017.06.011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89393863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Technical Aspects of Delivering Simultaneous Dual and Triple Ion Beams to a Target at the Michigan Ion Beam Laboratory 在密歇根离子束实验室同时向目标输送双离子束和三离子束的技术方面

Physics Procedia Pub Date : 2017-01-01 DOI: 10.1016/j.phpro.2017.09.039

O. Toader, F. Naab, E. Uberseder, T. Kubley, S. Taller, G. Was

{"title":"Technical Aspects of Delivering Simultaneous Dual and Triple Ion Beams to a Target at the Michigan Ion Beam Laboratory","authors":"O. Toader, F. Naab, E. Uberseder, T. Kubley, S. Taller, G. Was","doi":"10.1016/j.phpro.2017.09.039","DOIUrl":"10.1016/j.phpro.2017.09.039","url":null,"abstract":"<div><p>The Michigan Ion Beam Laboratory (MIBL) at the University of Michigan in Ann Arbor, Michigan, USA, plays a significant role in supporting the mission of the U.S. DOE Office of Nuclear Energy. MIBL is a charter laboratory of the NSUF (National Scientific User Facility – US DoE) and hosts users worldwide. The laboratory has evolved from a single accelerator laboratory to a highly versatile facility with three accelerators (3 MV Tandem, a 400kV Ion Implanter and a 1.7 MV Tandem), seven beam lines and five target chambers that together, provide unique capabilities to capture the extreme environment experienced by materials in reactor systems. This capability now includes simultaneous multiple (dual, triple) ion irradiations, an irradiation accelerated corrosion cell, and soon, in-situ dual beam irradiation in a transmission electron microscope (TEM) for the study of radiation damage coupled with injection of transmutation elements. The two beam lines that will connect to the 300kV FEI Tecnai G2 F30 microscope are expected to be operational by the end of 2017. Multiple simultaneous ion beam experiments involving light and heavy ions are already in progress. This paper will outline the current equipment and will focus on the new capability of running dual and triple ion beam experiments.</p></div>","PeriodicalId":20407,"journal":{"name":"Physics Procedia","volume":"90 ","pages":"Pages 385-390"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.phpro.2017.09.039","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89868767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Exploring Hominin and Non-hominin Primate Dental Fossil Remains with Neutron Microtomography 用中子微层析成像技术探索古人类和非古人类灵长类动物牙齿化石

Physics Procedia Pub Date : 2017-01-01 DOI: 10.1016/j.phpro.2017.06.014

Clément Zanolli , Burkhard Schillinger , Amélie Beaudet , Ottmar Kullmer , Roberto Macchiarelli , Lucia Mancini , Friedemann Schrenk , Claudio Tuniz , Vladimira Vodopivec

引用次数: 13

Research at the University of Kentucky Accelerator Laboratory 在肯塔基大学加速器实验室进行的研究

Physics Procedia Pub Date : 2017-01-01 DOI: 10.1016/j.phpro.2017.09.048

S.F. Hicks , M.A. Kovash

{"title":"Research at the University of Kentucky Accelerator Laboratory","authors":"S.F. Hicks , M.A. Kovash","doi":"10.1016/j.phpro.2017.09.048","DOIUrl":"10.1016/j.phpro.2017.09.048","url":null,"abstract":"<div><p>The Department of Physics and Astronomy at the University of Kentucky operates a 7-MV CN Van de Graaff accelerator that produces primary beams of protons, deuterons, and helium ions. An in-terminal pulsing and bunching system operates at 1.875MHz and is capable of providing 1ns beam bunches at an average current of several microamperes. Nearly all ongoing research programs involve secondary pulsed neutrons produced with gas cells containing deuterium or tritium, as well as with a variety of solid targets. Most experiments are performed at a target station positioned over a deep pit, so as to reduce the background created by backscattered neutrons. Recent experiments will be described; these include: measurements of <em>n-p</em> scattering total cross sections from <em>E</em><sub><em>n</em></sub> <em>=</em> 90 to 1800 keV to determine the <em>n</em>-<em>p</em> effective range parameter; the response of the plastic scintillator BC-418 below 1 MeV to low-energy recoil protons; <em>n-p</em> radiative capture cross sections important for our understanding of nucleosynthesis approximately 2minutes after the occurrence of the Big Bang; γ-ray spectroscopy following inelastic neutron scattering to study nuclear structure relevant to double-β decay and to understand the role of phonon-coupled excitations in weakly deformed nuclei; and measurements of neutron elastic and inelastic scattering cross sections for nuclei that are important for energy production and for our global understanding of the interaction of neutrons with matter.</p></div>","PeriodicalId":20407,"journal":{"name":"Physics Procedia","volume":"90 ","pages":"Pages 440-447"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.phpro.2017.09.048","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79503328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1