Recent experience in the fabrication and brazing of ceramic beam tubes for kicker magnets at FNAL

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Ceramic beam tubes are utilized in numerous kicker magnets in different accelerator rings at Fermi National Accelerator Laboratory. Kovar flanges are brazed onto each beam tube end, since kovar and high alumina ceramic have similar expansion curves. The tube, kovar flange, end piece, and braze foil (titanium/incusil) alloy brazing material are stacked in the furnace and then brazed in the furnace at 1000 C. The ceramic specified is 99.8% Alumina, Al{sub 2}O{sub 3}, a strong recrystallized high-alumina fabricated by slip casting. Recent experience at Fermilab with the fabrication and brazing of these tubes has brought to light numerous problems including ... continued below

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Ader, C.R.; Jensen, C.; Reilly, R.; Snee, D.; Wilson, J.H. & /Fermilab June 1, 2008.

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Ceramic beam tubes are utilized in numerous kicker magnets in different accelerator rings at Fermi National Accelerator Laboratory. Kovar flanges are brazed onto each beam tube end, since kovar and high alumina ceramic have similar expansion curves. The tube, kovar flange, end piece, and braze foil (titanium/incusil) alloy brazing material are stacked in the furnace and then brazed in the furnace at 1000 C. The ceramic specified is 99.8% Alumina, Al{sub 2}O{sub 3}, a strong recrystallized high-alumina fabricated by slip casting. Recent experience at Fermilab with the fabrication and brazing of these tubes has brought to light numerous problems including tube breakage and cracking and also the difficulty of brazing the tube to produce a leak-tight joint. These problems may be due to the ceramic quality, voids in the ceramic, thinness of the wall, and micro-cracks in the ends which make it difficult to braze because it cannot fill tiny surface cracks which are caused by grain pullout during the cutting process. Solutions which are being investigated include lapping the ends of the tubes before brazing to eliminate the micro-cracks and also metallization of the tubes.

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3 pages

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  • Journal Name: Conf.Proc.C0806233:wepc139,2008; Conference: Presented at 11th European Particle Accelerator Conference (EPAC 08), Magazzini del Cotone, Genoa, Italy, 23-27 Jun 2008

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  • Report No.: FERMILAB-CONF-08-188-AD
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 935236
  • Archival Resource Key: ark:/67531/metadc900051

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • June 1, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 9, 2016, 10:22 p.m.

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Ader, C.R.; Jensen, C.; Reilly, R.; Snee, D.; Wilson, J.H. & /Fermilab. Recent experience in the fabrication and brazing of ceramic beam tubes for kicker magnets at FNAL, article, June 1, 2008; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc900051/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.