Dynamic magnetic shield for the CLAS12 central TOF detector photomultiplier tubes
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| Title: | Dynamic magnetic shield for the CLAS12 central TOF detector photomultiplier tubes |
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| Authors: | Baturin, V.1 baturin@jlab.org, Burkert, V.1, Carman, D.S.1, Elouadrhyri, L.1, Grilli, D.2, Kashy, D.1, Pasyuk, E.1, Quettier, L.1, Wieland, B.1,3 |
| Source: | Nuclear Instruments & Methods in Physics Research Section A. Feb2012, Vol. 664 Issue 1, p11-21. 11p. |
| Subjects: | Magnetic shielding, Time-of-flight mass spectrometry, Photomultipliers, Finite element method, Solenoids, Computer software |
| Abstract: | Abstract: The Central Time-of-Flight detector for the Jefferson Laboratory 12-GeV upgrade is being designed with linear-focused photomultiplier tubes that require a robust magnetic shield against the CLAS12 main 5-T solenoid fringe fields of 100mT (1kG). Theoretical consideration of a ferromagnetic cylinder in an axial field has demonstrated that its shielding capability decreases with increasing length. This observation has been confirmed with finite element analysis using POISSON model software. Several shields composed of coaxial ferromagnetic cylinders have been studied. All difficulties caused by saturation effects were overcome with a novel dynamical shield, which utilizes a demagnetizing solenoid between the shielding cylinders. Basic dynamical shields for ordinary linear-focused 2-in. photomultiplier tubes were designed and tested both with models and experimental prototypes at different external field and demagnetizing current values. Our shield design reduces the 1kG external axial field by a factor of 5000. [Copyright &y& Elsevier] |
| Copyright of Nuclear Instruments & Methods in Physics Research Section A is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 70233167 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Dynamic magnetic shield for the CLAS12 central TOF detector photomultiplier tubes – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Baturin%2C+V%2E%22">Baturin, V.</searchLink><relatesTo>1</relatesTo><i> baturin@jlab.org</i><br /><searchLink fieldCode="AR" term="%22Burkert%2C+V%2E%22">Burkert, V.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Carman%2C+D%2ES%2E%22">Carman, D.S.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Elouadrhyri%2C+L%2E%22">Elouadrhyri, L.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Grilli%2C+D%2E%22">Grilli, D.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Kashy%2C+D%2E%22">Kashy, D.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Pasyuk%2C+E%2E%22">Pasyuk, E.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Quettier%2C+L%2E%22">Quettier, L.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wieland%2C+B%2E%22">Wieland, B.</searchLink><relatesTo>1,3</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Nuclear+Instruments+%26+Methods+in+Physics+Research+Section+A%22">Nuclear Instruments & Methods in Physics Research Section A</searchLink>. Feb2012, Vol. 664 Issue 1, p11-21. 11p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Magnetic+shielding%22">Magnetic shielding</searchLink><br /><searchLink fieldCode="DE" term="%22Time-of-flight+mass+spectrometry%22">Time-of-flight mass spectrometry</searchLink><br /><searchLink fieldCode="DE" term="%22Photomultipliers%22">Photomultipliers</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink><br /><searchLink fieldCode="DE" term="%22Solenoids%22">Solenoids</searchLink><br /><searchLink fieldCode="DE" term="%22Computer+software%22">Computer software</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract: The Central Time-of-Flight detector for the Jefferson Laboratory 12-GeV upgrade is being designed with linear-focused photomultiplier tubes that require a robust magnetic shield against the CLAS12 main 5-T solenoid fringe fields of 100mT (1kG). Theoretical consideration of a ferromagnetic cylinder in an axial field has demonstrated that its shielding capability decreases with increasing length. This observation has been confirmed with finite element analysis using POISSON model software. Several shields composed of coaxial ferromagnetic cylinders have been studied. All difficulties caused by saturation effects were overcome with a novel dynamical shield, which utilizes a demagnetizing solenoid between the shielding cylinders. Basic dynamical shields for ordinary linear-focused 2-in. photomultiplier tubes were designed and tested both with models and experimental prototypes at different external field and demagnetizing current values. Our shield design reduces the 1kG external axial field by a factor of 5000. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Nuclear Instruments & Methods in Physics Research Section A is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.nima.2011.10.003 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 11 StartPage: 11 Subjects: – SubjectFull: Magnetic shielding Type: general – SubjectFull: Time-of-flight mass spectrometry Type: general – SubjectFull: Photomultipliers Type: general – SubjectFull: Finite element method Type: general – SubjectFull: Solenoids Type: general – SubjectFull: Computer software Type: general Titles: – TitleFull: Dynamic magnetic shield for the CLAS12 central TOF detector photomultiplier tubes Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Baturin, V. – PersonEntity: Name: NameFull: Burkert, V. – PersonEntity: Name: NameFull: Carman, D.S. – PersonEntity: Name: NameFull: Elouadrhyri, L. – PersonEntity: Name: NameFull: Grilli, D. – PersonEntity: Name: NameFull: Kashy, D. – PersonEntity: Name: NameFull: Pasyuk, E. – PersonEntity: Name: NameFull: Quettier, L. – PersonEntity: Name: NameFull: Wieland, B. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 02 Text: Feb2012 Type: published Y: 2012 Identifiers: – Type: issn-print Value: 01689002 Numbering: – Type: volume Value: 664 – Type: issue Value: 1 Titles: – TitleFull: Nuclear Instruments & Methods in Physics Research Section A Type: main |
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