Optimization of four-button BPM configuration for small-gap beam chambers.

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Configuration of four-button beam position monitors (BPMs) employed in small-gap beam chambers is optimized from 2-D electrostatic calculation of induced charges on the button electrodes. The calculation shows that for a narrow chamber of width/height (2w/2h) >> 1, over 90% of the induced charges are distributed within a distance of 2h from the charged beam position in the direction of the chamber width. The most efficient configuration for a four-button BPM is to have a button diameter of (2-2.5) h with no button offset from the beam. The button sensitivities in this case are maximized and have good linearity with ... continued below

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10 p.

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Kim, S. H. May 27, 1998.

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Configuration of four-button beam position monitors (BPMs) employed in small-gap beam chambers is optimized from 2-D electrostatic calculation of induced charges on the button electrodes. The calculation shows that for a narrow chamber of width/height (2w/2h) >> 1, over 90% of the induced charges are distributed within a distance of 2h from the charged beam position in the direction of the chamber width. The most efficient configuration for a four-button BPM is to have a button diameter of (2-2.5) h with no button offset from the beam. The button sensitivities in this case are maximized and have good linearity with respect to the beam positions in the horizontal and vertical directions. The button sensitivities and beam coefficients are also calculated for the 8-mm and 5-mm chambers used in the insertion device straight sections of the 7-GeV Advanced Photon Source.

Physical Description

10 p.

Notes

INIS; OSTI as DE00010699

Medium: P; Size: 10 pages

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  • Beam Instrumentation Workshop (BIW'98), Palo Alto, CA (US), 05/04/1998--05/07/1998

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  • Report No.: ANL/ASD/CP-95936
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 10699
  • Archival Resource Key: ark:/67531/metadc623420

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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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  • May 27, 1998

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 6, 2017, 6:49 p.m.

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Kim, S. H. Optimization of four-button BPM configuration for small-gap beam chambers., article, May 27, 1998; Illinois. (digital.library.unt.edu/ark:/67531/metadc623420/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.