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A Metallurgical Inspection Method to Assess the Damage in Performance-Limiting Nb3Sn Accelerator Magnet Coils
The design and production of Nb<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub>Sn-based dipole and quadrupole magnets is critical for the realization of the High-Luminosity Large Hadron Collider (HL-LHC) at the Eur...
| Autores principales: | , , , , , , , , , , , , , , |
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| Lenguaje: | eng |
| Publicado: |
2022
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1109/TASC.2023.3237662 http://cds.cern.ch/record/2847454 |
| _version_ | 1780976776879538176 |
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| author | Moros, Alice Crouvizier, Mickael Denis Santillana, Ignacio Aviles Sgobba, Stefano Izquierdo Bermudez, Susana Lusa, Nicholas Ferradas Troitino, Jose Milanese, Attilio Todesco, Ezio Devred, Arnaud Ambrosio, Giorgio Baldini, Maria Ferracin, Paolo Schmalzle, Jesse Vallone, Giorgio |
| author_facet | Moros, Alice Crouvizier, Mickael Denis Santillana, Ignacio Aviles Sgobba, Stefano Izquierdo Bermudez, Susana Lusa, Nicholas Ferradas Troitino, Jose Milanese, Attilio Todesco, Ezio Devred, Arnaud Ambrosio, Giorgio Baldini, Maria Ferracin, Paolo Schmalzle, Jesse Vallone, Giorgio |
| author_sort | Moros, Alice |
| collection | CERN |
| description | The design and production of Nb<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub>Sn-based dipole and quadrupole magnets is critical for the realization of the High-Luminosity Large Hadron Collider (HL-LHC) at the European Organization for Nuclear Research (CERN). Nb<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub>Sn superconducting coils are aimed at enhancing the bending and focusing strengths of accelerator magnets for HL-LHC and beyond. Due to the brittle nature of Nb<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub>Sn, the coil fabrication steps are very challenging and require very careful QA/QC. Flaws in the Nb<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub>Sn filaments may lead to quenches, and eventually, performance limitation below nominal during magnet testing. A novel inspection method, including advanced non-destructive and destructive techniques, was developed to explore the root-causes of quenches occurring in performance-limiting coils. The most relevant results obtained for MQXF coils through this innovative inspection method are presented. This approach allows for precise assessment of the physical events associated with the quenches experienced by magnet coils, mainly occurring in the form of damaged strands with transversely broken sub-elements. Coil-slice preparation, micro-optical observations of transverse and longitudinal cross-sections, and a deep etching technique of copper will be illustrated in the present work, with a focus on the results achieved for a CERN coil from a non-conforming quadrupole magnet prototype, and two coils fabricated in the US, in the framework of the Accelerator Upgrade Project (AUP) collaboration, from two different non-conforming quadrupole magnets, respectively. The results obtained through the proposed inspection method will be illustrated. |
| id | cern-2847454 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2022 |
| record_format | invenio |
| spelling | cern-28474542023-09-29T02:20:51Zdoi:10.1109/TASC.2023.3237662http://cds.cern.ch/record/2847454engMoros, AliceCrouvizier, Mickael DenisSantillana, Ignacio AvilesSgobba, StefanoIzquierdo Bermudez, SusanaLusa, NicholasFerradas Troitino, JoseMilanese, AttilioTodesco, EzioDevred, ArnaudAmbrosio, GiorgioBaldini, MariaFerracin, PaoloSchmalzle, JesseVallone, GiorgioA Metallurgical Inspection Method to Assess the Damage in Performance-Limiting Nb3Sn Accelerator Magnet Coilsphysics.acc-phAccelerators and Storage RingsThe design and production of Nb<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub>Sn-based dipole and quadrupole magnets is critical for the realization of the High-Luminosity Large Hadron Collider (HL-LHC) at the European Organization for Nuclear Research (CERN). Nb<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub>Sn superconducting coils are aimed at enhancing the bending and focusing strengths of accelerator magnets for HL-LHC and beyond. Due to the brittle nature of Nb<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub>Sn, the coil fabrication steps are very challenging and require very careful QA/QC. Flaws in the Nb<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub>Sn filaments may lead to quenches, and eventually, performance limitation below nominal during magnet testing. A novel inspection method, including advanced non-destructive and destructive techniques, was developed to explore the root-causes of quenches occurring in performance-limiting coils. The most relevant results obtained for MQXF coils through this innovative inspection method are presented. This approach allows for precise assessment of the physical events associated with the quenches experienced by magnet coils, mainly occurring in the form of damaged strands with transversely broken sub-elements. Coil-slice preparation, micro-optical observations of transverse and longitudinal cross-sections, and a deep etching technique of copper will be illustrated in the present work, with a focus on the results achieved for a CERN coil from a non-conforming quadrupole magnet prototype, and two coils fabricated in the US, in the framework of the Accelerator Upgrade Project (AUP) collaboration, from two different non-conforming quadrupole magnets, respectively. The results obtained through the proposed inspection method will be illustrated.The design and production of Nb3Sn-based dipole and quadrupole magnets is critical for the realization of the High-Luminosity Large Hadron Collider (HL-LHC) at the European Organization for Nuclear Research (CERN). Nb3Sn superconducting coils are aimed at enhancing the bending and focusing strengths of accelerator magnets for HL-LHC and beyond. Due to the brittle nature of Nb3Sn, the coil fabrication steps are very challenging and require very careful QA/QC. Flaws in the Nb3Sn filaments may lead to quenches, and eventually, performance limitation below nominal during magnet testing. A novel inspection method, including advanced non-destructive and destructive techniques, was developed to explore the root-causes of quenches occurring in performance-limiting coils. The most relevant results obtained for MQXF coils through this innovative inspection method are presented. This approach allows for precise assessment of the physical events associated to the quenches experienced b y magnet coils, mainly occurring under the form of damaged strands with transversely broken sub-elements. Coil-slice preparation, micro-optical observations of transverse and longitudinal cross-sections, and a deep etching technique of copper will be illustrated in the present work, with a focus on the results achieved for a CERN coil from a non-conforming quadrupole magnet prototype, and two coils fabricated in the US, in the framework of the Accelerator Upgrade Project (AUP) collaboration, from two different non-conforming quadrupole magnets, respectively. The results obtained through the proposed inspection method will be illustrated.arXiv:2211.09684FERMILAB-PUB-22-859-TDoai:cds.cern.ch:28474542022-11-17 |
| spellingShingle | physics.acc-ph Accelerators and Storage Rings Moros, Alice Crouvizier, Mickael Denis Santillana, Ignacio Aviles Sgobba, Stefano Izquierdo Bermudez, Susana Lusa, Nicholas Ferradas Troitino, Jose Milanese, Attilio Todesco, Ezio Devred, Arnaud Ambrosio, Giorgio Baldini, Maria Ferracin, Paolo Schmalzle, Jesse Vallone, Giorgio A Metallurgical Inspection Method to Assess the Damage in Performance-Limiting Nb3Sn Accelerator Magnet Coils |
| title | A Metallurgical Inspection Method to Assess the Damage in Performance-Limiting Nb3Sn Accelerator Magnet Coils |
| title_full | A Metallurgical Inspection Method to Assess the Damage in Performance-Limiting Nb3Sn Accelerator Magnet Coils |
| title_fullStr | A Metallurgical Inspection Method to Assess the Damage in Performance-Limiting Nb3Sn Accelerator Magnet Coils |
| title_full_unstemmed | A Metallurgical Inspection Method to Assess the Damage in Performance-Limiting Nb3Sn Accelerator Magnet Coils |
| title_short | A Metallurgical Inspection Method to Assess the Damage in Performance-Limiting Nb3Sn Accelerator Magnet Coils |
| title_sort | metallurgical inspection method to assess the damage in performance-limiting nb3sn accelerator magnet coils |
| topic | physics.acc-ph Accelerators and Storage Rings |
| url | https://dx.doi.org/10.1109/TASC.2023.3237662 http://cds.cern.ch/record/2847454 |
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