Magnetic measurements of the elliptical multipole wiggler prototype

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Description

A prototype of the elliptical multipole wiggler (EMW) has been assembled, tested, and magnetically tuned at the APS. This prototype has a period of 160 mm with seven poles for the hybrid structure (antisymmetric configuration) and ten poles for the electromagnetic part of the EMW (symmetric configuration). The hybrid structure of the EMW produces a vertical magnetic field of 0.83 T (K{sub y} = 12) for a gap of 27 mm, and the electromagnet structure provides a maximum horizontal field of 0.12 T (K{sub x} = 1.6) with AC frequency up to 100 Hz. The alternation time is about 3 ... continued below

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7 p.

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Frachon, D.; Vasserman, I.; Ivanov, P.M.; Medvedko, E.A.; Gluskin, E. & Vinokurov, N.A. March 1, 1995.

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Description

A prototype of the elliptical multipole wiggler (EMW) has been assembled, tested, and magnetically tuned at the APS. This prototype has a period of 160 mm with seven poles for the hybrid structure (antisymmetric configuration) and ten poles for the electromagnetic part of the EMW (symmetric configuration). The hybrid structure of the EMW produces a vertical magnetic field of 0.83 T (K{sub y} = 12) for a gap of 27 mm, and the electromagnet structure provides a maximum horizontal field of 0.12 T (K{sub x} = 1.6) with AC frequency up to 100 Hz. The alternation time is about 3 ms. The requirements for electromagnetic field quality are very tight because the EMW introduces orbit perturbations in the vertical plane, where the emittance is smallest. Also the storage ring correction system cannot respond to perturbations of more than 10 Hz frequency. Thus the main effort during the magnetic tuning of the EMW was directed toward establishing time independence of the magnetic field integrals to better than 2 G-cm while the current was alternating through the electromagnet. This time independence has been achieved by implementing a special field integral compensation system and novel fast magnetic measurement techniques. Magnetic measurements of the EMW prototype have been performed at the APS insertion device magnetic measurement facility. A new fast acquisition system with a maximum sampling rate of 1 MHz has been developed and used for these measurements. Also a novel ``twisted coil`` technique has been used in order to make fast measurements of the second field integral. The field integral compensation on the order of 1 G-cm and 1,000 G-cm{sup 2} for the first and second integrals, respectively, has been achieved at electromagnet AC frequencies up to 100 Hz.

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7 p.

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INIS; OSTI as DE95010313

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  • Other Information: PBD: Mar 1995

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  • Other: DE95010313
  • Report No.: ANL/APS/TB--22
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/67450 | External Link
  • Office of Scientific & Technical Information Report Number: 67450
  • Archival Resource Key: ark:/67531/metadc703558

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Creation Date

  • March 1, 1995

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

Description Last Updated

  • Dec. 16, 2015, 5:32 p.m.

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Frachon, D.; Vasserman, I.; Ivanov, P.M.; Medvedko, E.A.; Gluskin, E. & Vinokurov, N.A. Magnetic measurements of the elliptical multipole wiggler prototype, report, March 1, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc703558/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.