Influence of mortar-induced stresses on the magnetic characteristics of the LEP dipole cores
The steel-concrete cores of the Large Electron Positron colliding-beam accelerator dipole magnets are built of regularly spaced soft-magnetic-steel laminations, the spaces being filled with cement mortar. The effect of compressive stresses on the permeability and the coercivity of soft magnetic stee...
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| Veröffentlicht in: | IEEE transactions on magnetics 1988-03, Vol.24 (2), p.843-846 |
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| container_title | IEEE transactions on magnetics |
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| creator | Billan, J. Gourber, J.P. Henrichsen, K.N. Laeger, H. Resegotti, L. |
| description | The steel-concrete cores of the Large Electron Positron colliding-beam accelerator dipole magnets are built of regularly spaced soft-magnetic-steel laminations, the spaces being filled with cement mortar. The effect of compressive stresses on the permeability and the coercivity of soft magnetic steel has been measured and the consequences for magnetic characteristics of the cores have been evaluated. By controlled straining of the aged cores in a hydraulic device, the tension in the mortar is brought locally to exceed the rupture limit. Thus, the compressive stresses in the steel laminations are partially relieved and the loss of bending strength in the dipoles is reduced. The excitation characteristics of the cores are measured by means of a fixed set of excitation windings and measuring coils into which the cores are moved after stress relieving. These measurements include determination of the equivalent surface areas of flux loops, which are embedded in the lower poles and will permit measurement of the field integral on the center line during LEP operation.< > |
| doi_str_mv | 10.1109/20.11356 |
| format | Article |
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The effect of compressive stresses on the permeability and the coercivity of soft magnetic steel has been measured and the consequences for magnetic characteristics of the cores have been evaluated. By controlled straining of the aged cores in a hydraulic device, the tension in the mortar is brought locally to exceed the rupture limit. Thus, the compressive stresses in the steel laminations are partially relieved and the loss of bending strength in the dipoles is reduced. The excitation characteristics of the cores are measured by means of a fixed set of excitation windings and measuring coils into which the cores are moved after stress relieving. These measurements include determination of the equivalent surface areas of flux loops, which are embedded in the lower poles and will permit measurement of the field integral on the center line during LEP operation.< ></description><identifier>ISSN: 0018-9464</identifier><identifier>EISSN: 1941-0069</identifier><identifier>DOI: 10.1109/20.11356</identifier><identifier>CODEN: IEMGAQ</identifier><language>eng</language><publisher>IEEE</publisher><subject>Area measurement ; Compressive stress ; Lamination ; Magnetic cores ; Magnetic field measurement ; Magnetic flux ; Mortar ; Soft magnetic materials ; Steel ; Stress measurement</subject><ispartof>IEEE transactions on magnetics, 1988-03, Vol.24 (2), p.843-846</ispartof><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c405t-bbf559394e146fef2de7bcc6a94808dd2a4284cf634b9e993ad738934c8679283</citedby><cites>FETCH-LOGICAL-c405t-bbf559394e146fef2de7bcc6a94808dd2a4284cf634b9e993ad738934c8679283</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/11356$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>314,780,784,796,27924,27925,54758</link.rule.ids><linktorsrc>$$Uhttps://ieeexplore.ieee.org/document/11356$$EView_record_in_IEEE$$FView_record_in_$$GIEEE</linktorsrc></links><search><creatorcontrib>Billan, J.</creatorcontrib><creatorcontrib>Gourber, J.P.</creatorcontrib><creatorcontrib>Henrichsen, K.N.</creatorcontrib><creatorcontrib>Laeger, H.</creatorcontrib><creatorcontrib>Resegotti, L.</creatorcontrib><title>Influence of mortar-induced stresses on the magnetic characteristics of the LEP dipole cores</title><title>IEEE transactions on magnetics</title><addtitle>TMAG</addtitle><description>The steel-concrete cores of the Large Electron Positron colliding-beam accelerator dipole magnets are built of regularly spaced soft-magnetic-steel laminations, the spaces being filled with cement mortar. The effect of compressive stresses on the permeability and the coercivity of soft magnetic steel has been measured and the consequences for magnetic characteristics of the cores have been evaluated. By controlled straining of the aged cores in a hydraulic device, the tension in the mortar is brought locally to exceed the rupture limit. Thus, the compressive stresses in the steel laminations are partially relieved and the loss of bending strength in the dipoles is reduced. The excitation characteristics of the cores are measured by means of a fixed set of excitation windings and measuring coils into which the cores are moved after stress relieving. These measurements include determination of the equivalent surface areas of flux loops, which are embedded in the lower poles and will permit measurement of the field integral on the center line during LEP operation.< ></description><subject>Area measurement</subject><subject>Compressive stress</subject><subject>Lamination</subject><subject>Magnetic cores</subject><subject>Magnetic field measurement</subject><subject>Magnetic flux</subject><subject>Mortar</subject><subject>Soft magnetic materials</subject><subject>Steel</subject><subject>Stress measurement</subject><issn>0018-9464</issn><issn>1941-0069</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1988</creationdate><recordtype>article</recordtype><recordid>eNqNkT1PwzAYhC0EEqUgsbJ5QiwBf8XxO6KqQKVKMMCGFDnOaxqUxsVOBv49CUVihOl0uuduOULOObvmnMGNmFTm-oDMOCieMabhkMwY4yYDpdUxOUnpfbQq52xGXledbwfsHNLg6TbE3sas6erBYU1THzElTDR0tN8g3dq3DvvGUbex0boeY5NGm6bqlK-XT7RudqFF6sJYPSVH3rYJz350Tl7uls-Lh2z9eL9a3K4zp1jeZ1Xl8xwkKORKe_SixqJyTltQhpm6FlYJo5zXUlWAANLWhTQglTO6AGHknFzud3cxfAyY-nLbJIdtazsMQyqFKbRg8j-gkhwK9jeoDICW-Qhe7UEXQ0oRfbmLzdbGz5KzcjqkFJOOh4zoxR5tEPEX-86-ANU1hQE</recordid><startdate>19880301</startdate><enddate>19880301</enddate><creator>Billan, J.</creator><creator>Gourber, J.P.</creator><creator>Henrichsen, K.N.</creator><creator>Laeger, H.</creator><creator>Resegotti, L.</creator><general>IEEE</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7U5</scope><scope>8FD</scope><scope>L7M</scope><scope>8BQ</scope><scope>JG9</scope></search><sort><creationdate>19880301</creationdate><title>Influence of mortar-induced stresses on the magnetic characteristics of the LEP dipole cores</title><author>Billan, J. ; Gourber, J.P. ; Henrichsen, K.N. ; Laeger, H. ; Resegotti, L.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c405t-bbf559394e146fef2de7bcc6a94808dd2a4284cf634b9e993ad738934c8679283</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1988</creationdate><topic>Area measurement</topic><topic>Compressive stress</topic><topic>Lamination</topic><topic>Magnetic cores</topic><topic>Magnetic field measurement</topic><topic>Magnetic flux</topic><topic>Mortar</topic><topic>Soft magnetic materials</topic><topic>Steel</topic><topic>Stress measurement</topic><toplevel>online_resources</toplevel><creatorcontrib>Billan, J.</creatorcontrib><creatorcontrib>Gourber, J.P.</creatorcontrib><creatorcontrib>Henrichsen, K.N.</creatorcontrib><creatorcontrib>Laeger, H.</creatorcontrib><creatorcontrib>Resegotti, L.</creatorcontrib><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>METADEX</collection><collection>Materials Research Database</collection><jtitle>IEEE transactions on magnetics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Billan, J.</au><au>Gourber, J.P.</au><au>Henrichsen, K.N.</au><au>Laeger, H.</au><au>Resegotti, L.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Influence of mortar-induced stresses on the magnetic characteristics of the LEP dipole cores</atitle><jtitle>IEEE transactions on magnetics</jtitle><stitle>TMAG</stitle><date>1988-03-01</date><risdate>1988</risdate><volume>24</volume><issue>2</issue><spage>843</spage><epage>846</epage><pages>843-846</pages><issn>0018-9464</issn><eissn>1941-0069</eissn><coden>IEMGAQ</coden><abstract>The steel-concrete cores of the Large Electron Positron colliding-beam accelerator dipole magnets are built of regularly spaced soft-magnetic-steel laminations, the spaces being filled with cement mortar. The effect of compressive stresses on the permeability and the coercivity of soft magnetic steel has been measured and the consequences for magnetic characteristics of the cores have been evaluated. By controlled straining of the aged cores in a hydraulic device, the tension in the mortar is brought locally to exceed the rupture limit. Thus, the compressive stresses in the steel laminations are partially relieved and the loss of bending strength in the dipoles is reduced. The excitation characteristics of the cores are measured by means of a fixed set of excitation windings and measuring coils into which the cores are moved after stress relieving. These measurements include determination of the equivalent surface areas of flux loops, which are embedded in the lower poles and will permit measurement of the field integral on the center line during LEP operation.< ></abstract><pub>IEEE</pub><doi>10.1109/20.11356</doi><tpages>4</tpages><oa>free_for_read</oa></addata></record> |
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| identifier | ISSN: 0018-9464 |
| ispartof | IEEE transactions on magnetics, 1988-03, Vol.24 (2), p.843-846 |
| issn | 0018-9464 1941-0069 |
| language | eng |
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| source | IEEE Electronic Library (IEL) |
| subjects | Area measurement Compressive stress Lamination Magnetic cores Magnetic field measurement Magnetic flux Mortar Soft magnetic materials Steel Stress measurement |
| title | Influence of mortar-induced stresses on the magnetic characteristics of the LEP dipole cores |
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