Adjustable Permanent Quadrupoles Using Rotating Magnet Material Rods for the Next Linear Collider

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The proposed Next Linear Collider (NLC) will require over 1400 adjustable quadrupoles between the main linacs' accelerator structures. These 12.7 mm bore quadrupoles will have a range of integrated strength from 0.6 to 132 Tesla, with a maximum gradient of 135 Tesla per meter, an adjustment range of +0-20% and effective lengths from 324 mm to 972 mm. The magnetic center must remain stable to within 1 micrometer during the 20% adjustment. In an effort to reduce estimated costs and increase reliability, several designs using hybrid permanent magnets have been developed. All magnets have iron poles and use either Samarium ... continued below

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73 Kilobytes pages

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al., James T Volk et September 24, 2001.

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The proposed Next Linear Collider (NLC) will require over 1400 adjustable quadrupoles between the main linacs' accelerator structures. These 12.7 mm bore quadrupoles will have a range of integrated strength from 0.6 to 132 Tesla, with a maximum gradient of 135 Tesla per meter, an adjustment range of +0-20% and effective lengths from 324 mm to 972 mm. The magnetic center must remain stable to within 1 micrometer during the 20% adjustment. In an effort to reduce estimated costs and increase reliability, several designs using hybrid permanent magnets have been developed. All magnets have iron poles and use either Samarium Cobalt or Neodymium Iron to provide the magnetic fields. Two prototypes use rotating rods containing permanent magnetic material to vary the gradient. Gradient changes of 20% and center shifts of less than 20 microns have been measured. These data are compared to an equivalent electromagnet prototype.

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73 Kilobytes pages

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  • Magnet Technologies 17, Geneva (CH), 09/24/2001--09/29/2001

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  • Report No.: FERMILAB-Conf-01/257-E
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 786649
  • Archival Resource Key: ark:/67531/metadc724380

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Office of Scientific & Technical Information Technical Reports

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  • September 24, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 1, 2016, 3:34 p.m.

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al., James T Volk et. Adjustable Permanent Quadrupoles Using Rotating Magnet Material Rods for the Next Linear Collider, article, September 24, 2001; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc724380/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.