A Rotating Coil Apparatus with Sub-Micrometer Magnetic Center Measurement Stability

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A rotating double coil apparatus has been designed and built so that the relative magnetic center change of a quadrupole is measured to an uncertainty smaller than 0.02 micrometers (=micron, {micro}m) for a single measurement. Furthermore, repeated measurements over about an hour vary by less than 0.1 {micro}m and by less than 1 {micro}m for periods of 24 hrs or longer. Correlation analyses of long data runs show that the magnet center measurement is sensitive to mechanical effects, such as vibration and rotating part wear, as well as to environmental effects, such as temperature and relative humidity. Evolving apparatus design ... continued below

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5 pages

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Spencer, Cherrill M.; Anderson, Scott, D.; Jensen, David R.; Wolf, Zachary R. & /SLAC December 2, 2005.

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Description

A rotating double coil apparatus has been designed and built so that the relative magnetic center change of a quadrupole is measured to an uncertainty smaller than 0.02 micrometers (=micron, {micro}m) for a single measurement. Furthermore, repeated measurements over about an hour vary by less than 0.1 {micro}m and by less than 1 {micro}m for periods of 24 hrs or longer. Correlation analyses of long data runs show that the magnet center measurement is sensitive to mechanical effects, such as vibration and rotating part wear, as well as to environmental effects, such as temperature and relative humidity. Evolving apparatus design has minimized mechanical noise and environmental isolation has reduced the effects of the surrounding environment so that sub-micron level measurement uncertainties and micron level stability have been achieved for multi-day measurement periods. Apparatus design evolution will be described in detail and correlation data taken on water-cooled electromagnet and adjustable permanent quadrupoles, which are about 350 mm in overall length, will be shown. These quads were prototypes for the linac quads of the Next Linear Collider (NLC) that had to meet the requirement that their magnetic centers change less than 1 micron during a 20% change in field strength. Thus it was necessary to develop an apparatus that could track the magnetic center with a fraction of a micron uncertainty.

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5 pages

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  • To appear in the proceedings of MT-19: 19th International Conference on Magnet Technology, Genova (Genoa), Italy, 18-23 Sep 2005

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  • Report No.: SLAC-PUB-11473
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 877531
  • Archival Resource Key: ark:/67531/metadc880205

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Office of Scientific & Technical Information Technical Reports

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

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • December 2, 2005

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 7, 2016, 8:46 p.m.

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Spencer, Cherrill M.; Anderson, Scott, D.; Jensen, David R.; Wolf, Zachary R. & /SLAC. A Rotating Coil Apparatus with Sub-Micrometer Magnetic Center Measurement Stability, article, December 2, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc880205/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.