Defect and Diffusion Forum Vol. 373 | p. 2

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<div class="page-name-block underline-begin"> <h1 class="page-name-block-text">Defect and Diffusion Forum Vol. 373</h1> </div> <div class="clearfix title-details"> <div class="papers-block-info col-lg-12"> <div class="row"> <div class="info-row-name normal-text-gray col-md-2 col-sm-3 col-xs-4"> <div class="row"> <p>DOI:</p> </div> </div> <div class="info-row-content semibold-middle-text col-md-10 col-sm-9 col-xs-8"> <div class="row"> <p><a href="https://doi.org/10.4028/www.scientific.net/DDF.373">https://doi.org/10.4028/www.scientific.net/DDF.373</a></p> </div> </div> </div> </div> <div id="titleMarcXmlLink" style="display: none" class="papers-block-info col-lg-12"> <div class="row"> <div class="info-row-name normal-text-gray col-md-2 col-sm-3 col-xs-4"> <div class="row"> <p>Export:</p> </div> </div> <div class="info-row-content semibold-middle-text col-md-10 col-sm-9 col-xs-8"> <div class="row"> <p><a href="/DDF.373/marc.xml">MARCXML</a></p> </div> </div> </div> </div> <div class="papers-block-info col-lg-12"> <div class="row"> <div class="info-row-name normal-text-gray col-md-2 col-sm-3 col-xs-4"> <div class="row"> <p>ToC:</p> </div> </div> <div class="info-row-content semibold-middle-text col-md-10 col-sm-9 col-xs-8"> <div class="row"> <p><a href="/DDF.373_toc.pdf">Table of Contents</a></p> </div> </div> </div> </div> </div> <div class="volume-tabs"> </div> <div class=""> <div class="volume-papers-page"> <div class="block-search-pagination clearfix"> <div class="block-search-volume"> <input id="paper-search" type="search" placeholder="Search" maxlength="65"> </div> <div class="pagination-container"><ul class="pagination"><li class="PagedList-skipToPrevious"><a href="/DDF.373" rel="prev"><</a></li><li><a href="/DDF.373">1</a></li><li class="active"><span>2</span></li><li><a href="/DDF.373/3">3</a></li><li><a href="/DDF.373/4">4</a></li><li><a href="/DDF.373/5">5</a></li><li class="PagedList-ellipses"><a class="PagedList-skipToNext" href="/DDF.373/6" rel="next">…</a></li><li class="PagedList-skipToNext"><a href="/DDF.373/3" rel="next">></a></li><li class="PagedList-skipToLast"><a href="/DDF.373/7">>></a></li></ul></div> </div> <div class="block-volume-title normal-text-gray"> <p> Paper Title <span>Page</span> </p> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.57">Project for a Source of Polarized Slow Positrons at ELI-NP</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Nikolay Djourelov, Andreea Oprisa, Victor Leca </div> </div> <div id="abstractTextBlock494835" class="volume-info volume-info-text volume-info-description"> Abstract: We describe the status of a project for obtaining an intense beam of polarized slow positrons at the Extreme Light Infrastructure - Nuclear Physics (ELI-NP) at Magurele (near Bucharest, Romania) [1]. Positrons will be created via pair production and moderated at a tungsten target using the pulsed brilliant gamma beam which will be produced by Compton back-scattering of circularly polarized laser photons on electrons from a warm linac beam [2]. Simulations of the interaction of circularly polarized <i>γ</i>‑rays of energies up to 3.5 MeV and an intensity of 2.4×10<sup>10</sup> <i>γ</i>/s with the target, moderation of created positrons and beam formation are discussed. The optimization of the target design showed that the primary slow positron beam can be obtained with intensity of 1‑2×10<sup>6</sup> <i>e</i><sup>+</sup>/s. The primary beam will be transversally polarized with a degree of polarization of ~30%. We discuss the necessity of changing the <i>e</i><sup>+</sup> beam polarization from transversal to longitudinal by an electrostatic 90˚ bender which is proposed to work in combination with a remoderator. Simulations show that neither the remoderator nor the electrostatic bender will change the degree of <i>e</i><sup>+</sup> beam polarization. The longitudinally polarized <i>e</i><sup>+</sup> can be successfully transported to the sample chambers without depolarization, but with reduced intensity (by approximately one order of magnitude) due to the remoderation. We present a convertor-moderator assembly with a hole which will allow creating positrons in parasitic mode, i.e., simultaneously with the nuclear physics experiments at ELI-NP. The positron spectroscopy laboratory at ELI-NP will be user dedicated and the beam will have the highest intensity of polarized slow positrons for material science in the world and therefore it could become a unique tool for investigation of magnetic samples. </div> <div> <a data-readmore="{ block: '#abstractTextBlock494835', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 57 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.61">Investigation of Non-Destructive Testing in Inner Cavity with Ant-Nest Structure Based on Positron Annihilation</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Jian Tang Liu, Min Zhao, Hui Xiao, Min Yao </div> </div> <div id="abstractTextBlock494942" class="volume-info volume-info-text volume-info-description"> Abstract: The existing testing method could not accurately detect the defects in inner cavity with ant-nest structure in a part. The reasons are as follows: the shape of inner cavity is irregular, the distribution of wall thickness is uneven and the material composition is complex etc. A new testing method is proposed based on positron annihilation in this paper. The radionuclide solution is injected in inner cavity of the part and then produces positrons which would annihilate within 2 nanoseconds in the polylactide (PLA) material. The information of inner cavity is reflected by counting the γ photons produced by positron annihilation. The maximum likelihood estimation model (MLEM) with average compensation is established according to the detected γ photons. A 2D slice image sequence is obtained by order subset expectation maximization (OSEM) algorithm which solves the MLEM. The targets such as defects in the 2D slice image need to be enhanced by OTSU algorithm. A 3D image is reconstructed by the enhanced 2D slice image sequence which is used to the detection and location of the defects in inner cavity. Two experiments under different environment are conducted which aim at different ant-nest structure parts. The parts are made of different material and made by different manufacture process. A good testing result of the parts with complex shaped inner cavity could be obtained. The results would not change with the change of external temperature or magnetic field and the testing precision can reach to millimeter level. </div> <div> <a data-readmore="{ block: '#abstractTextBlock494942', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 61 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.65">Spin-Polarized Positron Annihilation Study on Some Ferromagnets</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Hui Li, Masaki Maekawa, A. Miyashita, Atsuo Kawasuso </div> </div> <div id="abstractTextBlock494991" class="volume-info volume-info-text volume-info-description"> Abstract: We briefly review the spin-polarized positron annihilation experiments on some ferromagnets (Fe, Co, Ni, Gd, Co<sub>2</sub>MnSi, Co<sub>2</sub>MnAl and NiMnSb) using positron beams generated with <sup>68</sup>Ge-<sup>68</sup>Ga sources. The differential DBAR spectra between majority and minority spin electrons are well interpreted by the first principles band structure calculation. This further provides information about the half-metallicity of the Heusler alloys. The surfaces of Fe, Co and Ni are more negatively spin-polarized, that is, there are more majority than minority spin electrons. To explain the observed spin polarization quantitatively, detailed theoretical calculations and further experiments are required. </div> <div> <a data-readmore="{ block: '#abstractTextBlock494991', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 65 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.71">CDBTools - Evaluate Positron Annihilation Coincidence Doppler Broadening Spectrum</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Martin Petriska, Veronika Sabelová, Vladimir Slugeň </div> </div> <div id="abstractTextBlock495161" class="volume-info volume-info-text volume-info-description"> Abstract: CDBTools is a lightweight and easy to use application designed to provide you with an analysis tool for coincidence Doppler broadening (CDB) of the positron annihilation energy spectrum files. This application enables you to analyze the CDB and ratio curves, plots as well as graphs representing the evolution of the orbital electron momentum spectrum. The CDB extraction is provided by selectable filters applied at the diagonal line of the input matrix. To achieve CDB ratio curves with minimal error caused by 511keV peak shift, spectrum curves are recalculated by penalized regression spline. </div> <div> <a data-readmore="{ block: '#abstractTextBlock495161', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 71 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.75">New Precision Measurement of Hyperfine Splitting of Positronium</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Akira Ishida </div> </div> <div id="abstractTextBlock496242" class="volume-info volume-info-text volume-info-description"> Abstract: Positronium is an ideal system for precision tests of bound-state quantum electrodynamics (QED). One of the most precisely tested quantities of positronium is the ground-state hyperfine splitting (HFS). Recent progress on theoretical calculation revealed that there was a 16.0 ± 3.5 ppm (4.5 σ) discrepancy between the old experimental value and the theoretical calculation. We performed a new measurement which took into account the positronium thermalization effect for the first time. The result was HFS = 203.3942 ± 0.0016 (stat., 8.0 ppm) ± 0.0013 (syst., 6.4 ppm) GHz, which was consistent with the QED calculation within 1.1 σ, whereas it disfavored the old experimental values by 2.6 σ. It also showed that the positronium thermalization effect on HFS was as large as 10 ± 2 ppm, which was consistent with the discrepancy level within 1.5 σ, which could be the reason of the discrepancy. We are planning to preform a new experiment which uses a slow positron beam and perform HFS measurement in vacuum, instead of using gas as all of the other precision measurements. It will be completely free from material effect on HFS, including the thermalization effect. In this proceeding, summary of our previous work and details of the future new experiment are discussed. </div> <div> <a data-readmore="{ block: '#abstractTextBlock496242', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 75 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.80">Ionic Liquid Loaded Silica Gel Particles Studied by Spatially Resolved DBS Using a Scanning Positron Beam</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Markus Reiner, Hubert Ceeh, Thomas Gigl, Marco Haumann, Andreas Schönweiz, Christoph Hugenschmidt </div> </div> <div id="abstractTextBlock496997" class="volume-info volume-info-text volume-info-description"> Abstract: The CDB-spectrometer at NEPOMUC enables spatially resolved Doppler Broadening Spectroscopy of the electron-positron annihilation line with a lateral resolution of up to 200~$\mu$m (FWHM). We have applied this technique for studying single particles of silica gel dependent on loading with an altering amount of the ionic liquid [C2MIM][NTf2]. Our results reveal a strong correlation between the observables of DBS and the loading factor which presumably arises from a smaller inner surface of voids in loaded silica gel. </div> <div> <a data-readmore="{ block: '#abstractTextBlock496997', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 80 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.84">Study of Position-Sensitive PMTs as Gamma Cameras for 2D-ACAR</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Hubert Ceeh, Ralf Engels, Christian Wesolek, Josef Andreas Weber, Christoph Hugenschmidt </div> </div> <div id="abstractTextBlock497018" class="volume-info volume-info-text volume-info-description"> Abstract: We report on an assessment of the position resolving Hamamatsu-R3292 series photo-multiplier tubes with respect to their use for Angular Correlation of Annihilation Radiation (2D-ACAR) spectroscopy. The PMTs were coupled with a segmented scintillator and mounted at the Munich 2D-ACAR spectrometer. A series of measurements were performed in order to determine the energy and position resolution as well as the efficiency of the setup. Although a position resolution of Δ<sub><i>x</i>FWHM</sub>=1.98 mm was achieved, further improvements are needed. </div> <div> <a data-readmore="{ block: '#abstractTextBlock497018', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 84 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.91">Temperature Dependence of Radiation Damage in ODS Steel Studied by Triple Beam Irradiation and Positron Annihilation Techniques</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Da Qing Yuan, Qiao Li Zhang, Ping Fan, Xian Ping Wang, Bin Long, Hai Liang Ma, Yi Zuo, Ali Wen, Yong Nan Zheng, Xiang Shan Kong, Zhong Zhuang, Wei Feng, Jun Chen Liang, Wen Jun Xiong, Er Yang Lu, Xing Zhong Cao, Peng Zhang, Bao Yi Wang, Long Wei, Sheng Yun Zhu </div> </div> <div id="abstractTextBlock495119" class="volume-info volume-info-text volume-info-description"> Abstract: The oxide dispersed strengthened (ODS) ferritic-martensitic steel was irradiated by 100MeV iron ion whose energy was degraded by using a Ta foil of 4 μm thick, 100 keV Hydrogen and 200 keV Helium at 480, 515, 550 and 580 °C. The irradiation fluences were 1×10<sup>16</sup>, 1.1×10<sup>15</sup> and 6.8×10<sup>13</sup>/cm<sup>2</sup>, respectively for Fe, H and He. The techniques of positron annihilation lifetime and Doppler broadening of slow positron beam were utilized to examine the produced radiation damage. At 550 °C the maximal positron annihilation lifetime and S parameter of Doppler broadening were observed, implyin g tha t 550 °C is the pea k temperature of swelling. The <i>S </i> parameter and annihilation lifetime of the sample irradiated at 515 °C by the single Fe ion beam were smaller compared to the triple beam irradiation at the same temperature, implying that the triple beam irradiation caused more severe damage than the single beam irradiation. </div> <div> <a data-readmore="{ block: '#abstractTextBlock495119', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 91 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.96">PALS and TEM Study on Irradiation Defects of 12Cr-ODS Steels Induced by He/H Ions</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Lu Hui Han, Tao Fa, Ya Wen Zhao </div> </div> <div id="abstractTextBlock495154" class="volume-info volume-info-text volume-info-description"> Abstract: The purpose of this study is to evaluate the irradiation defects of 12Cr-ODS steels induced by He/H ions, to provide basic understanding concerning development of fusion reactor components. Firstly, single He、H ion implantation and He/H ion co-implantation of 12Cr-ODS steels were performed at room temperature; and then SIMS were used to determine the He/H ion depth; finally, the irradiation induced defects were investigated by PALS and TEM. Characterization of the implanted samples with SIMS shows that He/H ions are mainly distributed at 4-6μm depth, consistent with the SRIM simulation. The PALS results show that the positron lifetime of H ions implanted samples increases slightly with increasing incident ions fluence, while for He and He/H ion implantation it is reversed. In addition, TEM results demonstrate that after irradiation, cavities are created in all samples, and He ion irradiation produce seriously larger damage compared to H ion. The positron lifetime results can be mainly ascribed to the difference of He and H ion interaction with defects. </div> <div> <a data-readmore="{ block: '#abstractTextBlock495154', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 96 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.100">Study on the Evolution of Defects in Helium-Implanted Tungsten</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Kang Wang, Ai Hong Deng, Ling Wang, Yong Wang, Xiao Bo Lu, Min Gong </div> </div> <div id="abstractTextBlock495164" class="volume-info volume-info-text volume-info-description"> Abstract: The microstructure of He<sup>+</sup>-irradiation induced defects in tungsten was studied as functions of annealing temperature by means of scanning electron microscope (SEM) and Doppler broadening positron annihilation spectroscopy (DB-PAS). The results show that the <i>S</i> parameter become higher after helium implanted in tungsten. When the annealing temperature increases to 923 K, plenty of large size of holes and new types of defects could be found in this sample. </div> <div> <a data-readmore="{ block: '#abstractTextBlock495164', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 100 </div> </div> <div class="block-bottom-pagination"> <div class="pager-info"> <p>Showing 11 to 20 of 68 Paper Titles</p> </div> <div class="pagination-container"><ul class="pagination"><li class="PagedList-skipToPrevious"><a href="/DDF.373" rel="prev"><</a></li><li><a href="/DDF.373">1</a></li><li class="active"><span>2</span></li><li><a href="/DDF.373/3">3</a></li><li><a href="/DDF.373/4">4</a></li><li><a href="/DDF.373/5">5</a></li><li class="PagedList-ellipses"><a class="PagedList-skipToNext" href="/DDF.373/6" rel="next">…</a></li><li class="PagedList-skipToNext"><a href="/DDF.373/3" rel="next">></a></li><li class="PagedList-skipToLast"><a href="/DDF.373/7">>></a></li></ul></div> </div> </div> </div> </div> </div> </div> </div> <div class="social-icon-popup"> <a href="https://www.facebook.com/Scientific.Net.Ltd/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon facebook-popup-icon social-icon"></i></a> <a href="https://twitter.com/Scientific_Net/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon twitter-popup-icon social-icon"></i></a> <a href="https://www.linkedin.com/company/scientificnet/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon linkedin-popup-icon social-icon"></i></a> </div> </div> <div class="sc-footer"> <div class="footer-fluid"> <div class="container"> <div class="row"> <div class="footer-menu col-md-12 col-sm-12 col-xs-12"> <ul class="list-inline menu-font"> <li><a href="/ForLibraries">For Libraries</a></li> <li><a href="/ForPublication/Paper">For Publication</a></li> <li><a href="/insights" target="_blank">Insights</a></li> <li><a href="/DocuCenter">Downloads</a></li> <li><a href="/Home/AboutUs">About Us</a></li> <li><a href="/PolicyAndEthics/PublishingPolicies">Policy & Ethics</a></li> <li><a href="/Home/Contacts">Contact Us</a></li> <li><a href="/Home/Imprint">Imprint</a></li> <li><a href="/Home/PrivacyPolicy">Privacy Policy</a></li> <li><a href="/Home/Sitemap">Sitemap</a></li> <li><a href="/Conferences">All Conferences</a></li> <li><a href="/special-issues">All Special Issues</a></li> <li><a href="/news/all">All News</a></li> <li><a href="/read-and-publish-agreements">Read & Publish Agreements</a></li> </ul> </div> </div> </div> </div> <div class="line-footer"></div> <div class="footer-fluid"> <div class="container"> <div class="row"> <div class="col-xs-12"> <a href="https://www.facebook.com/Scientific.Net.Ltd/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon facebook-footer-icon social-icon"></i></a> <a href="https://twitter.com/Scientific_Net/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon twitter-footer-icon social-icon"></i></a> <a href="https://www.linkedin.com/company/scientificnet/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon linkedin-footer-icon social-icon"></i></a> </div> </div> </div> </div> <div class="line-footer"></div> <div class="footer-fluid"> <div class="container"> <div class="row"> <div class="col-xs-12 footer-copyright"> <p> © 2024 Trans Tech Publications Ltd. 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Defect and Diffusion Forum Vol. 373 | p. 2 | Scientific.Net