Physics Procedia最新文献_第7页

Characterization of a 6 MeV Accelerator Driven Mixed Neutron/Photon Source 6 MeV加速器驱动混合中子/光子源的表征

Physics Procedia Pub Date : 2017-01-01 Epub Date: 2017-10-26 DOI: 10.1016/j.phpro.2017.09.054

Matthew Hodges, Alexander Barzilov, Yi-Tung Chen, Daniel Lowe

引用次数: 4

Electron Accelerators for Novel Cargo Inspection Methods 用于新型货物检验方法的电子加速器

Physics Procedia Pub Date : 2017-01-01 Epub Date: 2017-10-26 DOI: 10.1016/j.phpro.2017.09.036

S. Kutsaev, R. Agustsson, A. Arodzero, S. Boucher, J. Hartzell, A. Murokh, F. O'Shea, A.Yu. Smirnov

{"title":"Electron Accelerators for Novel Cargo Inspection Methods","authors":"S. Kutsaev, R. Agustsson, A. Arodzero, S. Boucher, J. Hartzell, A. Murokh, F. O'Shea, A.Yu. Smirnov","doi":"10.1016/j.phpro.2017.09.036","DOIUrl":"10.1016/j.phpro.2017.09.036","url":null,"abstract":"<div><p>One of the main factors limiting the performance of conventional x-ray cargo inspection with material discrimination (MD) is the interlaced mode of system operation. Such systems use pulsed linac or betatron x-ray generators and produce alternate bremsstrahlung pulses with lower- and higher- end-point energies. Consequently, these systems provide about 50mm lower penetration than a system operated in a non-interlaced mode, have a limited range of cargo areal densities with valid MD, and cannot perform MD of objects smaller than the pulse separation. Also, the limited pulse repetition rate of x-ray generators in interlaced mode limits the radiographic image quality at nominal commercial speeds of vehicles or trains.</p><p>Several new methods of cargo inspection with MD were recently introduced to address the above-mentioned limitations: dual-energy methods based on Scintillation-Cherenkov detectors <span>[1]</span>; multi-energy method based on intrapulse time-varying of spectral content of x-ray <span>[1]</span>, <span>[2]</span>; multi-energy method utilized ramping-up energy packet of short x-ray pulses <span>[3]</span>, <span>[4]</span>; and methods based on multi-energy betatron <span>[5]</span>, <span>[6]</span>. All of these methods have electron accelerators as a core element. However, the accelerator requirements and, thus, their designs, are different for each system. In this paper, we will discuss the requirements for the accelerators, provide some details about their designs, and present several novel solutions for current and future projects.</p></div>","PeriodicalId":20407,"journal":{"name":"Physics Procedia","volume":"90 ","pages":"Pages 115-125"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.phpro.2017.09.036","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76843829","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: 26

Beam Diameter Reduction by Optimization of an Extraction Condition in a Compact Ion Microbeam System 紧凑离子微束系统中萃取条件优化减小光束直径

Physics Procedia Pub Date : 2017-01-01 Epub Date: 2017-10-26 DOI: 10.1016/j.phpro.2017.09.022

Takeru Ohkubo, Yasuyuki Ishii

引用次数: 5

Investigation of Cutting Quality of Remote DOE Laser Cutting in 0.5 mm Stainless Steel 0.5 mm不锈钢远程DOE激光切割质量研究

Physics Procedia Pub Date : 2017-01-01 Epub Date: 2017-09-26 DOI: 10.1016/j.phpro.2017.08.007

Sigurd Lazic Villumsen, Morten Kristiansen

引用次数: 0

The Early Stage of Neutron Tomography for Cultural Heritage Study in Thailand 中子层析成像技术在泰国文化遗产研究中的早期应用

Physics Procedia Pub Date : 2017-01-01 Epub Date: 2017-06-24 DOI: 10.1016/j.phpro.2017.06.016

S. Khaweerat , W. Ratanatongchai , S.Wonglee , B. Schillinger

{"title":"The Early Stage of Neutron Tomography for Cultural Heritage Study in Thailand","authors":"S. Khaweerat , W. Ratanatongchai , S.Wonglee , B. Schillinger","doi":"10.1016/j.phpro.2017.06.016","DOIUrl":"10.1016/j.phpro.2017.06.016","url":null,"abstract":"<div><p>In parallel to the upgrade of neutron imaging facility at TRR-1/M1 since 2015, the practice on image processing software has led to implementation of neutron tomography (NT). The current setup provides a thermal neutron flux of 1.08×10<sup>6</sup> cm<sup>-2</sup>sec<sup>-1</sup> at the exposure position. In general, the sample was fixed on a plate at the top of rotary stage controlled by Labview 2009 Version 9.0.1. The incremental step can be adjusted from 0.45 to 7.2 degree. A 16 bit CCD camera assembled with a Nikkor 50mm f/1.2 lens was used to record light from <sup>6</sup>LiF/ZnS (green) neutron converter screen. The exposure time for each shot was 60seconds, resulting in the acquisition time of approximately three hours for completely turning the sample around. Afterwards, the batch of two dimensional neutron images of the sample was read into the reconstruction and visualization software Octopus reconstruction 8.8 and Octopus visualization 2.0, respectively. The results revealed that the system alignment is important. Maintaining the stability of heavy sample at every particular angle of rotation is important. Previous alignment showed instability of the supporting plane while tilting the sample. This study showed that the sample stage should be replaced. Even though the NT is a lengthy process and involves large data processing, it offers an opportunity to better understand features of an object in more details than with neutron radiography. The digital NT also allows us to separate inner features that appear superpositioned in radiography by cross-sectioning the 3D data set of an object without destruction. As a result, NT is a significant tool for revealing hidden information included in the inner structure of cultural heritage objects, providing great benefits in archaeological study, conservation process and authenticity investigating.</p></div>","PeriodicalId":20407,"journal":{"name":"Physics Procedia","volume":"88 ","pages":"Pages 123-127"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.phpro.2017.06.016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83083282","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: 4

Reliability Estimation of Neutron Resonance Thermometry Using Tantalum and Tungsten 钽钨中子共振测温的可靠性评估

Physics Procedia Pub Date : 2017-01-01 Epub Date: 2017-06-24 DOI: 10.1016/j.phpro.2017.06.042

Tetsuya Kai , Kosuke Hiroi , Yuhua Su , Takenao Shinohara , Joseph D. Parker , Yoshihiro Matsumoto , Hirotoshi Hayashida , Mariko Segawa , Takeshi Nakatani , Kenichi Oikawa , Shuoyuan Zhang , Yoshiaki Kiyanagi

{"title":"Reliability Estimation of Neutron Resonance Thermometry Using Tantalum and Tungsten","authors":"Tetsuya Kai , Kosuke Hiroi , Yuhua Su , Takenao Shinohara , Joseph D. Parker , Yoshihiro Matsumoto , Hirotoshi Hayashida , Mariko Segawa , Takeshi Nakatani , Kenichi Oikawa , Shuoyuan Zhang , Yoshiaki Kiyanagi","doi":"10.1016/j.phpro.2017.06.042","DOIUrl":"10.1016/j.phpro.2017.06.042","url":null,"abstract":"<div><p>The reliability of neutron resonance thermometry was discussed based on measurements of neutrons transmitted through tantalum (0.1mm thick) and tungsten (1mm thick) indicators at 26, 96, 189, and 285 degrees Celsius using the energy-resolved neutron imaging system, RADEN, at the Japan Proton Accelerator Complex (J-PARC). The intensity of transmitted neutrons at the sides of resonance dips were found to decrease with increasing temperature. Sensitivity coefficients to convert this decrease to temperature were derived, and two-dimensional distributions of the decreasing rates, being proportional to the temperature distribution, were obtained. The reliability of estimated temperature was calculated as a function of temporal and spatial resolution assuming that the dominant factor of the reliability was the uncertainty in the neutron counts. The authors set a target of neutron resonance thermometry for practical applications, and found a required efficiency of the neutron detector for resonance thermometry.</p></div>","PeriodicalId":20407,"journal":{"name":"Physics Procedia","volume":"88 ","pages":"Pages 306-313"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.phpro.2017.06.042","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75791506","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: 8

Determining the 14O(α,p)17F astrophysical rate from Measurements at TwinSol 从TwinSol测量确定14o (α，p) 17f天体物理速率

Physics Procedia Pub Date : 2017-01-01 Epub Date: 2017-10-26 DOI: 10.1016/j.phpro.2017.09.043

D.W. Bardayan , T. Ahn , J.M. Allen , M. Brodeur , B. Frentz , Y.K. Gupta , M.R. Hall , O. Hall , S. Henderson , J. Hu , J.M. Kelly , J.J. Kolata , A. Long , C. Nicoloff , P.D. O’Malley , K. Ostdiek , M.K. Smith , S. Strauss , F.D. Becchetti , J. Riggins , A.M. Rogers

{"title":"Determining the 14O(α,p)17F astrophysical rate from Measurements at TwinSol","authors":"D.W. Bardayan , T. Ahn , J.M. Allen , M. Brodeur , B. Frentz , Y.K. Gupta , M.R. Hall , O. Hall , S. Henderson , J. Hu , J.M. Kelly , J.J. Kolata , A. Long , C. Nicoloff , P.D. O’Malley , K. Ostdiek , M.K. Smith , S. Strauss , F.D. Becchetti , J. Riggins , A.M. Rogers","doi":"10.1016/j.phpro.2017.09.043","DOIUrl":"10.1016/j.phpro.2017.09.043","url":null,"abstract":"<div><p>The <sup>14</sup>O(α,p)<sup>17</sup>F reaction is an important trigger reaction to the α-p process in X-ray bursts. The most stringent experimental constraints on its astrophysical rate come from measurements of the time-inverse reaction, <sup>17</sup>F(p,α)<sup>14</sup>O. Previous studies of this inverse reaction have sufficiently characterized the high-energy dependence of the cross section but there are still significant uncertainties at lower energies. A new measurement of the <sup>17</sup>F(p,α)<sup>14</sup>O cross section is underway at the Twin Solenoid (<em>TwinSol)</em> facility at the University of Notre Dame using an in-flight secondary <sup>17</sup>F beam. The initial results are promising but improvements are needed to complete the measurement. The initial data and plans for an improved measurement are presented in this manuscript.</p></div>","PeriodicalId":20407,"journal":{"name":"Physics Procedia","volume":"90 ","pages":"Pages 415-420"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.phpro.2017.09.043","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77292956","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: 0

The Magnification of Atomic Lines Intensity Originated by laser Breakdown in Ultrasound Field 超声场激光击穿引起的原子线强度放大

Physics Procedia Pub Date : 2017-01-01 Epub Date: 2017-02-20 DOI: 10.1016/j.phpro.2017.01.006

A.V. Bulanov , I.G. Nagorny

引用次数: 0

Embedding carbon fibre structures in metal matrixes for additive manufacturing 在金属基体中嵌入碳纤维结构用于增材制造

Physics Procedia Pub Date : 2017-01-01 Epub Date: 2017-09-26 DOI: 10.1016/j.phpro.2017.08.016

Jan Frostevarg , Stephanie Robertson , Vicente Benavides , Alexander Soldatov

{"title":"Embedding carbon fibre structures in metal matrixes for additive manufacturing","authors":"Jan Frostevarg , Stephanie Robertson , Vicente Benavides , Alexander Soldatov","doi":"10.1016/j.phpro.2017.08.016","DOIUrl":"10.1016/j.phpro.2017.08.016","url":null,"abstract":"<div><p>It is possible to reinforce structures and components using carbon fibres for applications in electronics and medicine, but most commonly used in reinforcing resin fibre composites for personal protection equipment and light weight constructions. Carbon fibres act as stress redistributors while having increased electrical and thermal conductivities. These properties could also be utilized in metal matrixes, if the fibres are properly fused to the metal and the structure remains intact. Another recently developed high potential carbon structure, carbon nanotube- (CNT) yarns, has similar but even greater mechanical properties than common carbon fibres. Via laser cladding, these reinforcing materials could be used in a plethora of applications, either locally (or globally) as surface treatments or as structural reinforcements using multi-layer laser cladding (additive manufacturing). The challenges of embedding carbon fibres or CNT-yarns in a CuAl mixture and SnPb solder wire using lasers are here investigated using high speed imaging and SEM. It is revealed that the carbon fibres have very high buoyancy in the molten metal and quickly degrades when irradiated by the laser. Wetting of the fibres is shown to be improved by a Tungsten coating and embedding of the structures after processing are evaluated using SEM and Raman spectroscopy.</p></div>","PeriodicalId":20407,"journal":{"name":"Physics Procedia","volume":"89 ","pages":"Pages 39-48"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.phpro.2017.08.016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90350948","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: 3

Determination of the Secondary Neutron Flux at the Massive Natural Uranium Spallation Target 天然铀散裂靶处二次中子通量的测定

Physics Procedia Pub Date : 2017-01-01 Epub Date: 2017-10-26 DOI: 10.1016/j.phpro.2017.09.021

M. Zeman , J. Adam , A.A. Baldin , W.I. Furman , S.A. Gustov , K. Katovsky , J. Khushvaktov , I.I. Mar‘in , F. Novotny , A.A. Solnyshkin , P. Tichy , V.M. Tsoupko-Sitnikov , S.I. Tyutyunnikov , R. Vespalec , J. Vrzalova , V. Wagner , L. Zavorka

{"title":"Determination of the Secondary Neutron Flux at the Massive Natural Uranium Spallation Target","authors":"M. Zeman , J. Adam , A.A. Baldin , W.I. Furman , S.A. Gustov , K. Katovsky , J. Khushvaktov , I.I. Mar‘in , F. Novotny , A.A. Solnyshkin , P. Tichy , V.M. Tsoupko-Sitnikov , S.I. Tyutyunnikov , R. Vespalec , J. Vrzalova , V. Wagner , L. Zavorka","doi":"10.1016/j.phpro.2017.09.021","DOIUrl":"10.1016/j.phpro.2017.09.021","url":null,"abstract":"<div><p>The flux of secondary neutrons generated in collisions of the 660 MeV proton beam with the massive natural uranium spallation target was investigated using a set of monoisotopic threshold activation detectors. Sandwiches made of thin high-purity Al, Co, Au, and Bi metal foils were installed in different positions across the whole spallation target. The gamma-ray activity of products of (n,xn) and other studied reactions was measured offline with germanium semiconductor detectors. Reaction yields of radionuclides with half-life exceeding 100min and with effective neutron energy thresholds between 3.6 MeV and 186 MeV provided us with information about the spectrum of spallation neutrons in this energy region and beyond. The experimental neutron flux was determined using the measured reaction yields and cross-sections calculated with the TALYS 1.8 nuclear reaction program and INCL4-ABLA event generator of MCNP6. Neutron spectra in the region of activation sandwiches were also modeled with the radiation transport code MCNPX 2.7. Neutron flux based on excitation functions from TALYS provides a reasonable description of the neutron spectrum inside the spallation target and is in good agreement with Monte-Carlo predictions. The experimental flux that uses INCL4 cross-sections rather underestimates the modeled spectrum in the whole region of interest, but the agreement within few standard deviations was reached as well. The paper summarizes basic principles of the method for determining the spectrum of high-energy neutrons without employing the spectral adjustment routines and points out to the need for model improvements and precise cross-section measurements.</p></div>","PeriodicalId":20407,"journal":{"name":"Physics Procedia","volume":"90 ","pages":"Pages 69-78"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.phpro.2017.09.021","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80814571","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: 0