<?xml version="1.0" encoding="UTF-8"?> <rss version="2.0" xmlns:media="http://search.yahoo.com/mrss/" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:opensearch="http://a9.com/-/spec/opensearch/1.1/"> <channel> <title>CERN Document Server</title> <link>https://cds.cern.ch</link> <description>CERN Document Server latest documents</description> <language>en</language> <pubDate>Mon, 17 Feb 2025 16:30:00 GMT</pubDate> <category></category> <generator>Invenio 1.1.3.1106-62468</generator> <ttl>360</ttl> <atom:link rel="self" href="/rss?f=author&amp;ln=en&amp;p=Bartova%2C+Barbora" /> <opensearch:totalResults>6</opensearch:totalResults> <opensearch:startIndex>1</opensearch:startIndex> <opensearch:itemsPerPage>25</opensearch:itemsPerPage> <image> <url>https://cds.cern.ch/img/site_logo_rss.png</url> <title>CERN Document Server</title> <link>https://cds.cern.ch</link> </image> <atom:link rel="search" href="https://cds.cern.ch/opensearchdescription" type="application/opensearchdescription+xml" title="Content Search" /> <textInput> <title>Search </title> <description>Search this site:</description> <name>p</name> <link>https://cds.cern.ch/search</link> </textInput> <item> <title>Developments on SRF coatings at CERN</title> <link>https://cds.cern.ch/record/2288263</link> <description>The thin films techniques applied to Superconducting RF (SRF) has a long history at CERN. A large panel of cavities have been coated from LEP, to LHC. For the current and future projects (HIE-ISOLDE, HL-LHC, FCC) there is a need for further higher RF-performances with focus on minimizing residual resistance Rres and maximizing quality factor Q0 of the cavities. This paper will present CERN’s developments on thin films to achieve these goals through the following main axes of research: The first one concerns the application of different coating techniques for Nb (DC-bias diode sputtering, magnetron sputtering and HiPIMS). Another approach is the investigation of alternative materials like Nb$_{3}$Sn. These lines of development will be supported by a material science approach to characterize and evaluate the layer properties by means of FIB-SEM, TEM, XPS, XRD, etc. In addition a numerical tool for plasma simulation will be exploited to develop adapted coating systems and optimize the coating process, from plasma generation to thin film growth.</description> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Sublet, Alban</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Aull, Sarah</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bártová, Barbora</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Calatroni, Sergio</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Richard, Thibaut</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Rosaz, Guillaume</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Taborelli, Mauro</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Therasse, Mathieu</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Venturini Delsolaro, Walter</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Zhang, Pei</dc:creator> <pubDate>Thu, 12 Oct 2017 04:12:55 GMT</pubDate> <guid>https://cds.cern.ch/record/2288263</guid> <media:content xmlns:media="http://search.yahoo.com/mrss/" url="https://cds.cern.ch/record/2288263/files/tupb027.pdf"/> <dc:title xmlns:dc="http://purl.org/dc/elements/1.1/" xml:lang="fr"/> <dc:hasPart xmlns:dc="http://purl.org/dc/elements/1.1/">['']</dc:hasPart> <dc:hasVersion xmlns:dc="http://purl.org/dc/elements/1.1/"/> </item> <item> <title>Evaluation of Young’s modulus of MgB2 filaments in composite wires for the superconducting links for the high-luminosity LHC upgrade</title> <link>https://cds.cern.ch/record/2265755</link> <description>MgB2 wire is a promising superconductor for the superconducting links for the high-luminosity upgrade of the large Hadron collider at CERN. The mechanical properties of MgB2 must be fully quantified for the cable design, and in this study, we evaluate the Young's modulus of MgB2 filaments in wires with a practical level of critical current. The Young's moduli of MgB2 filaments by two different processes, in situ and ex situ, were compared. Two different evaluation methods were applied to an in situ MgB2 wire, a single-fiber tensile test and a tensile test after removing Monel. In addition, the Young's modulus of the few-micron-thick Nb–Ni reaction layer in an ex situ processed wire was evaluated using a nanoindentation testing technique to improve the accuracy of analysis based on the rule of mixtures. The Young's moduli of the in situ and ex situ MgB2 wires were in the range of 76–97 GPa and no distinct difference depending on the fabrication process was found.</description> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Sugano, Michinaka</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Ballarino, Amalia</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bartova, Barbora</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bjoerstad, Roger</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Gerardin, Alexandre</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Scheuerlein, Christian</dc:creator> <pubDate>Wed, 24 May 2017 04:44:11 GMT</pubDate> <guid>https://cds.cern.ch/record/2265755</guid> <dc:title xmlns:dc="http://purl.org/dc/elements/1.1/" xml:lang="fr"/> <dc:hasPart xmlns:dc="http://purl.org/dc/elements/1.1/">['']</dc:hasPart> <dc:hasVersion xmlns:dc="http://purl.org/dc/elements/1.1/"/> </item> <item> <title>Characterization of Nb Coating in HIE-ISOLDE QWR Superconducting Accelerating Cavities by means of SEM-FIB and TEM</title> <link>https://cds.cern.ch/record/2141886</link> <description>The Quarter Wave Resonators (QWR) high-β cavities (0.3m diameter and 0.9m height) are made from OFE 3D-forged copper and are coated by DC-bias diode sputtering with a thin superconducting layer of niobium. The Nb film thickness, morphology, purity and quality are critical parameters for RF performances of the cavity. They have been investigated in a detailed material study. The coating structure at different positions along a test cavity was observed by cross-section imaging using SEM-FIB instrument. The samples from the top of the cavity showed presence of unexpected porosities, whose volume was investigated using FIB tomography. TEM lamella was prepared for two samples (top part and inner conductor of the cavity) to study in detail the grain orientation in the coating, its chemical composition and structure. The 14-layer structure in thick coating was indeed evidenced by the TEM analysis. Chemical mapping revealed the presence of a few nm in size copper precipitates close to the Nb/Cu interface and a passivating oxide layer of 10 nm thickness on top of the coating and around porosities. However no impurities or interface layer along the coating profile were present.</description> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bártová, Barbora</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Aebersold, Arthur</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Alexander, Duncan</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Calatroni, Sergio</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Cantoni, Marco</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Sublet, Alban</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Taborelli, Mauro</dc:creator> <pubDate>Sun, 27 Mar 2016 05:28:13 GMT</pubDate> <guid>https://cds.cern.ch/record/2141886</guid> <media:content xmlns:media="http://search.yahoo.com/mrss/" url="https://accelconf.web.cern.ch/IPAC2015/papers/wepha022.pdf"/> <media:content xmlns:media="http://search.yahoo.com/mrss/" url="https://cds.cern.ch/record/2141886/files/wepha022.pdf"/> <dc:title xmlns:dc="http://purl.org/dc/elements/1.1/" xml:lang="fr"/> <dc:hasPart xmlns:dc="http://purl.org/dc/elements/1.1/">['']</dc:hasPart> <dc:hasVersion xmlns:dc="http://purl.org/dc/elements/1.1/"/> </item> <item> <title>Development and Production of Non-evaporable Getter Coatings for MAX IV</title> <link>https://cds.cern.ch/record/2141883</link> <description>MAX IV is presently under construction at Lund, Sweden, and the first beam for the production of synchrotron radiation is expected to circulate in 2016. The whole set of 3-GeV ring beam pipes is coated with Ti-Zr-V Non Evaporable Getter (NEG) thin film in order to fulfil the average pressure requirement of 1x10⁻⁹ mbar, despite the compact magnet layout and the large aspect ratio of the vacuum chambers. In this work, we present the optimisations of the coating process performed at CERN to coat different geometries and mechanical assembling used for the MAX IV vacuum chambers; the morphology of the thin films is analysed by Scanning Electron Microscopy; the composition and thickness is measured by Energy Dispersive X-ray analysis; the activation of the NEG thin film is monitored by X-ray Photoemission Spectroscopy; the vacuum performance of the coated beam pipes is evaluated by the measurement of hydrogen sticking coefficient. The results of the coating production characterisation for the 84 units coated at CERN are presented.</description> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Costa Pinto, Pedro</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Ahlbäck, Jonny</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Al-Dmour, Eshraq</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bártová, Barbora</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Grabski, Marek</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Holliger, Benjamin</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Marques Dos Santos, Sergio</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Nistor, Valentin</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Pasquino, Chiara</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Sapountzis, Antonios</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Taborelli, Mauro</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Wevers, Ivo</dc:creator> <pubDate>Sun, 27 Mar 2016 05:28:07 GMT</pubDate> <guid>https://cds.cern.ch/record/2141883</guid> <media:content xmlns:media="http://search.yahoo.com/mrss/" url="https://accelconf.web.cern.ch/IPAC2015/papers/wepha019.pdf"/> <media:content xmlns:media="http://search.yahoo.com/mrss/" url="https://cds.cern.ch/record/2141883/files/wepha019.pdf"/> <dc:title xmlns:dc="http://purl.org/dc/elements/1.1/" xml:lang="fr"/> <dc:hasPart xmlns:dc="http://purl.org/dc/elements/1.1/">['']</dc:hasPart> <dc:hasVersion xmlns:dc="http://purl.org/dc/elements/1.1/"/> </item> <item> <title>Characterization of Nb coating in HIE-ISOLDE QWR superconducting accelerating cavities by means of SEM-FIB and TEM</title> <link>https://cds.cern.ch/record/2017412</link> <description>The Quarter Wave Resonators (QWR) high-β cavities (0.3 m diameter and 0.9 m height) are made from OFE 3D-forged copper and are coated by DC-bias diode sputtering with a thin superconducting layer of niobium. The Nb film thickness, morphology, purity and quality are critical parameters for RF performances of the cavity. They have been investigated in a detailed material study. </description> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bartova, Barbora</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Sublet, Alban Rene Maurice</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Taborelli, M</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Aebersold, A B</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Alexander, D T L</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Cantoni, M</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Calatroni, Sergio</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">CERN. Geneva. ATS Department</dc:creator> <pubDate>Thu, 21 May 2015 08:40:18 GMT</pubDate> <dc:date xmlns:dc="http://purl.org/dc/elements/1.1/">21 May 2015</dc:date> <dc:source xmlns:dc="http://purl.org/dc/elements/1.1/">CERN-ACC-Note-2015-0012</dc:source> <guid>https://cds.cern.ch/record/2017412</guid> <media:content xmlns:media="http://search.yahoo.com/mrss/" url="https://cds.cern.ch/record/2017412/files/CERN-ACC-NOTE-2015-0012-BARTOVA.pdf"/> <dc:title xmlns:dc="http://purl.org/dc/elements/1.1/" xml:lang="fr"/> <dc:hasPart xmlns:dc="http://purl.org/dc/elements/1.1/">2015</dc:hasPart> <dc:hasVersion xmlns:dc="http://purl.org/dc/elements/1.1/">0012</dc:hasVersion> </item> <item> <title>Nb Coated HIE-ISOLDE QWR Superconducting Accelerating Cavities: From Process Development to Series Production</title> <link>https://cds.cern.ch/record/2003148</link> <description>The new HIE-ISOLDE accelerator at CERN requires the production of 32 superconducting cavities (20 high- β and 12 low- β ) in order to increase the energy of the rare isotope beam delivered to the experiments. The Quarter Wave Resonators (QWR) cavities (0.3m diameter and 0.9m height for the high- β ) are made of OFE 3D-forged copper and are coated by DC-bias diode sputtering with a thin superconducting layer of niobium. Following a preliminary process development phase, the series production of the high-beta cavities has started. A summary of the production process is presented, with a focus on the coating recipe developed to meet the HIE- ISOLDE specifications (operation at 4.5 K with an accelerating field of 6 MV/m at 10W RF losses, Q 0 =4.7x10 8 and an average surface resistance of 65 n Ω ) and on the niobium layer characteristics. The RF performances of cavities produced with the coating baseline recipe are reviewed.</description> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Sublet, Alban</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Aviles Santillana, Ignacio</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bartova, Barbora</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Calatroni, Sergio</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Jecklin, Noemie</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Mondino, Irene</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Therasse, Mathieu</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Venturini Delsolaro, Walter</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Zhang, Pei</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Cantoni, Marco</dc:creator> <pubDate>Wed, 25 Mar 2015 09:28:25 GMT</pubDate> <guid>https://cds.cern.ch/record/2003148</guid> <media:content xmlns:media="http://search.yahoo.com/mrss/" url="http://jacow.org/IPAC2014/papers/wepri042.pdf"/> <media:content xmlns:media="http://search.yahoo.com/mrss/" url="https://cds.cern.ch/record/2003148/files/wepri042.pdf"/> <dc:title xmlns:dc="http://purl.org/dc/elements/1.1/" xml:lang="fr"/> <dc:hasPart xmlns:dc="http://purl.org/dc/elements/1.1/">['']</dc:hasPart> <dc:hasVersion xmlns:dc="http://purl.org/dc/elements/1.1/"/> </item> </channel> </rss>