<?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>Sun, 24 Nov 2024 15:39:22 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=ja&amp;p=Navas%2C+Elisa+Maria+Ruiz" /> <opensearch:totalResults>2</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>Weld Qualification of the Cold Mass of the Superconducting Quadrupoles Magnets (MQXF) for the HL-LHC Project</title> <link>https://cds.cern.ch/record/2892259</link> <description>The High Luminosity Large Hadron Collider (HL-LHC) is a major upgrade to the existing Large Hadron Collider (LHC) at CERN, aimed at increasing the integrated luminosity of the collider by a factor of ten [1]. A key component of the HL-LHC are the superconducting Nb3Sn quadrupole magnets, known as MQXF, whose purpose is to focus the particle beam [3]. In order to ensure the proper operation and structural reliability of the MQXF quadrupoles, it is essential to qualify the welds of their cold mass, used as a He container of the magnets. This paper describes the process of qualification of the welds involved in the closure of the cold mass, including the testing and inspection methods used to evaluate their strength and soundness. The results of the qualification process are used to ensure that the MQXF quadrupoles cold masses can withstand the high-stress operating conditions of the HL-LHC and operate as expected at cryogenic temperature. The qualification process has been used to implement a novel approach for quality control of the production parts using Phased Array Ultrasonic Testing (PAUT). This advanced testing method uses phased array ultrasonic probes to scan the welds and generate a detail 3D image of their internal structure. This allows for a more accurate and efficient inspection of the welds, compared to traditional ultrasonic testing methods. Overall, the welding qualification process for the cold mass of the MQXF quadrupoles is a crucial step in ensuring the safe and reliable operation of the HL-LHC.</description> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Castro, Enrique Rodriguez</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/">Sgobba, Stefano</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Izquierdo, Gonzalo Arnau</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bonnin, Simon</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Bampton, Tavis</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Prin, Herve</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Todesco, Ezio</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Navas, Elisa Maria Ruiz</dc:creator> <pubDate>Wed, 20 Mar 2024 05:33:41 GMT</pubDate> <guid>https://cds.cern.ch/record/2892259</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>Secondary Phases Quantification and Fracture Toughness at Cryogenic Temperature of Austenitic Stainless Steel Welds for High-Field Superconducting Magnets</title> <link>https://cds.cern.ch/record/2674334</link> <description>The ITER magnet system is based on the “cable-in-conduit” conductor concept, which consists of various types of stainless steel jackets filled with superconducting strands. The jackets provide high strength and fracture toughness to counteract the high stress imposed by, amongst others, electromagnetic loads at cryogenic temperature. Material properties of austenitic stainless steel at cryogenic temperature are known to some extent, but only partial information is available for their welds, particularly in combination with weld fillers envisaged for cryogenic service. When a full inspection of the welded components is not possible, it becomes of special interest an assessment of its fracture toughness under close-to-service conditions if a fracture mechanics’ design approach is to be adopted. In absence of defects, brittle secondary phases are generally held responsible of the loss of ductility and toughness which is to be expected after postweld heat treatments. Their quantification becomes thus essential in order to explain the negative impact in fracture toughness after unavoidable thermal treatments. This paper investigates fracture toughness behavior at 7 K of AISI 316L and AISI 316LN tungsten inert gas welds using two fillers adapted to cryogenic service, EN 1.4453 and JK2LB. Additionally, the effect of such an aforementioned heat treatment, here the Nb$_3$Sn reaction heat treatment (650° for 200 h) on fracture toughness of the welds is evaluated. A correlation between the evolution of properties and the quantity of secondary phases as a result of the above treatment is provided.</description> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Santillana, Ignacio Aviles</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Pison, Pilar Fernandez</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Langeslag, Stefanie Agnes Elisabeth</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Sgobba, Stefano</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Lunt, Alexander</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Boyer, Christelle</dc:creator> <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Navas, Elisa Maria Ruiz</dc:creator> <pubDate>Tue, 14 May 2019 04:57:55 GMT</pubDate> <guid>https://cds.cern.ch/record/2674334</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> </channel> </rss>