Commissioning results of the narrow-band beam position monitor system upgrade in the APS storage ring.

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When using a low emittance storage ring as a high brightness synchrotron radiation source, it is critical to maintain a very high degree of orbit stability, both for the short term and for the duration of an operational fill. A fill-to-fill reproducibility is an additional important requirement. Recent developments in orbit correction algorithms have provided tools that are capable of achieving a high degree of orbit stability. However, the performance of these feedback systems can be severely limited if there are errors in the beam position monitors (BPMs). The present orbit measurement and correction system at the APS storage ring ... continued below

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5 p.

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Singh, O. April 20, 1999.

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When using a low emittance storage ring as a high brightness synchrotron radiation source, it is critical to maintain a very high degree of orbit stability, both for the short term and for the duration of an operational fill. A fill-to-fill reproducibility is an additional important requirement. Recent developments in orbit correction algorithms have provided tools that are capable of achieving a high degree of orbit stability. However, the performance of these feedback systems can be severely limited if there are errors in the beam position monitors (BPMs). The present orbit measurement and correction system at the APS storage ring utilizes 360 broad-band-type BPMs that provide turn-by-turn diagnostics and an ultra-stable orbit: < 1.8 micron rms vertically and 4.5 microns rms horizontally in a frequency band of 0.017 to 30 Hz. The effects of beam intensity and bunch pattern dependency on these BPMs have been significantly reduced by employing offset compensation correction. Recently, 40 narrow-band switching-type BPMs have been installed in the APS storage ring, two in each of 20 operational insertion device straight sections, bringing the total number of beam position monitors to 400. The use of narrow-band BPM electronics is expected to reduce sensitivity to beam intensity, bunch pattern dependence, and long-term drift. These beam position monitors are used for orbit correction/feedback and machine protection interlocks for the insertion device beamlines. The commissioning results and overall performance for orbit stability are provided.

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5 p.

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INIS; OSTI as DE00011144

Medium: P; Size: 5 pages

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  • 1999 Particle Accelerator Conference (PAC '99), New York, NY (US), 03/29/1999--04/02/1999

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  • Report No.: ANL/ASD/CP-97747
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 11144
  • Archival Resource Key: ark:/67531/metadc621672

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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.

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  • April 20, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 11, 2017, 12:16 p.m.

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Singh, O. Commissioning results of the narrow-band beam position monitor system upgrade in the APS storage ring., article, April 20, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc621672/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.