Magnetic measurement data of the 0.8-m prototype quadrupole magnets for the APS storage ring

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From magnetic measurement data of the two 0.8-m prototype quadrupole magnets (P-SRQ-1 and P-SRQ-2) and the study of the geometries for the pole-end bevels and pole chamfers, the following conclusions have been made. Mechanical stability of the magnet poles has been achieved by modification of the weld procedures between two quadrants of the magnets. Stability of the magnet-pole positions was measured optically and was also concluded from the fact that the allowed coefficients, mainly sextupole and octupole terms, were independent of the magnet excitation currents. Unallowed multipole field coefficients for the second magnet, without correction of the magnet-pole positions, are ... continued below

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21 p.

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Kim, S.H. July 1, 1995.

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Description

From magnetic measurement data of the two 0.8-m prototype quadrupole magnets (P-SRQ-1 and P-SRQ-2) and the study of the geometries for the pole-end bevels and pole chamfers, the following conclusions have been made. Mechanical stability of the magnet poles has been achieved by modification of the weld procedures between two quadrants of the magnets. Stability of the magnet-pole positions was measured optically and was also concluded from the fact that the allowed coefficients, mainly sextupole and octupole terms, were independent of the magnet excitation currents. Unallowed multipole field coefficients for the second magnet, without correction of the magnet-pole positions, are smaller than for the first magnet. The field gradient integrals of the two magnets at 400A differ by less than 5 {times} 10{sup {minus}4} for r = 2.5 cm. This indicates that an acceptable magnet assembly procedure has been established. The 2-D calculations and ``body`` measurements for allowed coefficients after the main field, b{sub 5} and b{sub 9}, agree within 1.2 {times} 10{sup {minus}4} at r = 2.5 cm. This implies that the 2-D design geometry is basically correct and acceptable. As expected for a magnet with long and narrow poles, saturation effects of pole shims have been observed. In order to reduce fabrication cost for the end-plates, the geometries for the pole-end bevels and pole chamfers have been studied. By choosing a bevel angle of 61{degree}, instead of 45{degree}, it is possible to have acceptable allowed coefficients with dimensions of pole-chamfers up to 16.5 mm. This allows the design of the end-plate as one piece without removable pole-tip.

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21 p.

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INIS; OSTI as DE95015573

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  • Other Information: PBD: [1995]

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  • Other: DE95015573
  • Report No.: LS--175
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/105657 | External Link
  • Office of Scientific & Technical Information Report Number: 105657
  • Archival Resource Key: ark:/67531/metadc621802

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  • July 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • Dec. 14, 2015, 12:08 p.m.

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Kim, S.H. Magnetic measurement data of the 0.8-m prototype quadrupole magnets for the APS storage ring, report, July 1, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc621802/: accessed July 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.