Physics Procedia最新文献_第8页

A Study on Inhomogeneous Neutron Intensity Distribution Origin from Neutron Guide Transportation 中子导输引起的非均匀中子强度分布研究

Physics Procedia Pub Date : 2017-01-01 DOI: 10.1016/j.phpro.2017.06.048

Yu Wang, Guohai Wei, Hongli Wang, Yuntao Liu, Linfeng He, Kai Sun, Songbai Han, Dongfeng Chen

引用次数: 2

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 DOI: 10.1016/j.phpro.2017.01.006

A.V. Bulanov , I.G. Nagorny

引用次数: 0

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 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

Staging of RF-accelerating Units in a MEMS-based Ion Accelerator 基于mems的离子加速器中射频加速单元的分段

Physics Procedia Pub Date : 2017-01-01 DOI: 10.1016/j.phpro.2017.09.040

A. Persaud , P.A. Seidl , Q. Ji , E. Feinberg , W.L. Waldron , T. Schenkel , S. Ardanuc , K.B. Vinayakumar , A. Lal

{"title":"Staging of RF-accelerating Units in a MEMS-based Ion Accelerator","authors":"A. Persaud , P.A. Seidl , Q. Ji , E. Feinberg , W.L. Waldron , T. Schenkel , S. Ardanuc , K.B. Vinayakumar , A. Lal","doi":"10.1016/j.phpro.2017.09.040","DOIUrl":"10.1016/j.phpro.2017.09.040","url":null,"abstract":"<div><p>Multiple Electrostatic Quadrupole Array Linear Accelerators (MEQALACs) provide an opportunity to realize compact radio- frequency (RF) accelerator structures that can deliver very high beam currents. MEQALACs have been previously realized with acceleration gap distances and beam aperture sizes of the order of centimeters. Through advances in Micro-Electro-Mechanical Systems (MEMS) fabrication, MEQALACs can now be scaled down to the sub-millimeter regime and batch processed on wafer substrates. In this paper we show first results from using three RF stages in a compact MEMS-based ion accelerator. The results presented show proof-of-concept with accelerator structures formed from printed circuit boards using a 3 × 3 beamlet arrangement and noble gas ions at 10 keV. We present a simple model to describe the measured results. We also discuss some of the scaling behaviour of a compact MEQALAC. The MEMS-based approach enables a low-cost, highly versatile accelerator covering a wide range of currents (10μA to 100mA) and beam energies (100 keV to several MeV). Applications include ion-beam analysis, mass spectrometry, materials processing, and at very high beam powers, plasma heating.</p></div>","PeriodicalId":20407,"journal":{"name":"Physics Procedia","volume":"90 ","pages":"Pages 136-142"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.phpro.2017.09.040","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75799204","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

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 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

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 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

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 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

Neutron Microtomography of MgB2 Superconducting Multifilament Wire MgB2超导多丝线的中子显微层析成像

Physics Procedia Pub Date : 2017-01-01 DOI: 10.1016/j.phpro.2017.06.012

Pavel Trtik , Christian Scheuerlein , Patrick Alknes , Michael Meyer , Florian Schmid , Eberhard Lehmann

引用次数: 3

High-Statistics β+/EC-Decay Study of 122Xe 122xe的高统计β + / ec衰变研究

Physics Procedia Pub Date : 2017-01-01 DOI: 10.1016/j.phpro.2017.09.047

B. Jigmeddorj , P.E. Garrett , C.A. Andreoiu , G.C. Ball , T. Bruhn , D.S. Cross , A.B. Garnsworthy , B. Hadinia , M. Moukaddam , J. Park , J.L. Pore , A.J. Radich , M.M. Rajabali , E.T. Rand , U. Rizwan , C.E. Svensson , P. Voss , Z. Wang , J.L. Wood , S.W. Yates

引用次数: 1

Hybrid Laser-Arc Welding of the High-Strength Shipbuilding Steels: Equipment and Technology 高强度船舶钢的激光电弧复合焊接:设备与技术☆

Physics Procedia Pub Date : 2017-01-01 DOI: 10.1016/j.phpro.2017.08.005

G. Turichin , M. Kuznetsov , I. Tsibulskiy , A. Firsova

{"title":"Hybrid Laser-Arc Welding of the High-Strength Shipbuilding Steels: Equipment and Technology","authors":"G. Turichin , M. Kuznetsov , I. Tsibulskiy , A. Firsova","doi":"10.1016/j.phpro.2017.08.005","DOIUrl":"10.1016/j.phpro.2017.08.005","url":null,"abstract":"<div><p>Hybrid laser-arc welding (HLAW) allows getting weld joints with thickness up to 35mm for one pass, provide good quality formation of joints, minimal thermal deformations, the productivity in 10 times more in comparison with arc welding. In addition, replacement arc welding to the HLAW allows economizing filler materials, shielding gas and consumable electricity more than 4 times. Therefore, HLAW is actually technology for basic engineering branches and especially for shipbuilding. The Institute of Laser and Welding Technologies (ILWT) developed laser and hybrid laser-arc welding technologies for different type of steels and alloys including high-strength shipbuilding steels. Also ILWT produced portal and robotic systems for HLAW process realization. Portal system for hybrid laser-arc welding of panels with dimensions 6x6 m using at the manufacturing of flat curvilinear sections in the shipbuilding is depicted in the article. Results of experimental researches of the hybrid laser-arc welding parameters influence on the formation and mechanical properties of weld joint are described at the publication also. Experimental part was made with using of the portal system.</p></div>","PeriodicalId":20407,"journal":{"name":"Physics Procedia","volume":"89 ","pages":"Pages 156-163"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.phpro.2017.08.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85540104","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: 40