Measuring the Magnetic Center Behavior of an ILC Superconducting Quadrupole Prototype

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The main linacs of the proposed International Linear Collider (ILC) consist of superconducting cavities operated at 2K. The accelerating cavities are contained in a contiguous series of cryogenic modules that also house the main linac quadrupoles, thus the quadrupoles also need to be superconducting. In an early ILC design, these magnets are about 0.6 m long, have cos (2{theta}) coils, and operate at constant field gradients up to 60 T/m. In order to preserve the small beam emittances in the ILC linacs, the e+ and e- beams need to traverse the quadrupoles near their magnetic centers. A quadrupole shunting technique ... continued below

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4 pages

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Spencer, Cherrill M.; Adolphsen, Chris; Berndt, Martin; Jensen, David R.; Rogers, Ron; Sheppard, John C. et al. February 7, 2011.

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The main linacs of the proposed International Linear Collider (ILC) consist of superconducting cavities operated at 2K. The accelerating cavities are contained in a contiguous series of cryogenic modules that also house the main linac quadrupoles, thus the quadrupoles also need to be superconducting. In an early ILC design, these magnets are about 0.6 m long, have cos (2{theta}) coils, and operate at constant field gradients up to 60 T/m. In order to preserve the small beam emittances in the ILC linacs, the e+ and e- beams need to traverse the quadrupoles near their magnetic centers. A quadrupole shunting technique is used to measure the quadrupole alignment with the beams; this process requires the magnetic centers move by no more than about 5 micrometers when their strength is changed. To determine if such tight stability is achievable in a superconducting quadrupole, we at SLAC measured the magnetic center motions in a prototype ILC quadrupole built at CIEMAT in Spain. A rotating coil technique was used with a better than 0.1 micrometer precision in the relative field center position, and less than a 2 micrometer systematic error over 30 minutes. This paper describes the warm-bore cryomodule that houses the quadrupole in its Helium vessel, the magnetic center measurement system, the measured center data and strength and harmonics magnetic data.

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4 pages

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  • Journal Name: IEEE Trans.Appl.Supercond.20:1964-1968,2010; Conference: Presented at21st International Conference on Magnet Technology, Hefei, China, 10/19/2009-10/23/2009

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  • Report No.: SLAC-PUB-13815
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 1004937
  • Archival Resource Key: ark:/67531/metadc836820

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  • February 7, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Nov. 29, 2016, 7:55 p.m.

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Spencer, Cherrill M.; Adolphsen, Chris; Berndt, Martin; Jensen, David R.; Rogers, Ron; Sheppard, John C. et al. Measuring the Magnetic Center Behavior of an ILC Superconducting Quadrupole Prototype, article, February 7, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc836820/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.