Adjustable permanent quadrupoles 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 138 Tesla, with a maximum gradient of 141 Tesla per meter, an adjustment range of +0 to {minus}20% and effective lengths from 324 mm to 972 mm. The magnetic center must remain stable to within 1 micron during the 20% adjustment. In an effort to reduce costs and increase reliability, several designs using hybrid permanent magnets have been developed. Four different prototypes have been built. All magnets ... continued below

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73 Kilobytes pages

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al., James T. Volk et June 22, 2001.

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Description

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 138 Tesla, with a maximum gradient of 141 Tesla per meter, an adjustment range of +0 to {minus}20% and effective lengths from 324 mm to 972 mm. The magnetic center must remain stable to within 1 micron during the 20% adjustment. In an effort to reduce costs and increase reliability, several designs using hybrid permanent magnets have been developed. Four different prototypes have been built. All magnets have iron poles and use Samarium Cobalt to provide the magnetic fields. Two use rotating permanent magnetic material to vary the gradient, one uses a sliding shunt to vary the gradient and the fourth uses counter rotating magnets. Preliminary data on gradient strength, temperature stability, and magnetic center position stability are presented. These data are compared to an equivalent electromagnetic prototype.

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73 Kilobytes pages

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  • Particle Accelerator Conference 2001, Chicago, IL (US), 06/18/2001--06/22/2001

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  • Report No.: FERMILAB-Conf-01-093
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 781956
  • Archival Resource Key: ark:/67531/metadc724545

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  • June 22, 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 for the next linear collider, article, June 22, 2001; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc724545/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.