Sensitivity and offset calibration for the beam position monitors at the Advanced Photon Source

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The beam position monitors (BPMs) play a critically important role in commissioning and operation of accelerators. Accurate determination of the offsets relative to the magnetic axis and sensitivities of individual BPMs is thus needed. We will describe in this paper the schemes for calibrating all of the 360 BPMs for sensitivity and offset in the 7-GeV Advanced Photon Source (APS) storage ring and the results. For the sensitivity calibration, a 2-dimensional map of the BPM response in the aluminum vacuum chamber is obtained theoretically, which is combined with the measured nonlinear response of the BPM electronics. A set of 2-dimensional ... continued below

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4 p.

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Chung, Y.; Barr, D.; Decker, G.; Evans, K. Jr. & Kahana, E. July 1, 1995.

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Description

The beam position monitors (BPMs) play a critically important role in commissioning and operation of accelerators. Accurate determination of the offsets relative to the magnetic axis and sensitivities of individual BPMs is thus needed. We will describe in this paper the schemes for calibrating all of the 360 BPMs for sensitivity and offset in the 7-GeV Advanced Photon Source (APS) storage ring and the results. For the sensitivity calibration, a 2-dimensional map of the BPM response in the aluminum vacuum chamber is obtained theoretically, which is combined with the measured nonlinear response of the BPM electronics. A set of 2-dimensional polynomial coefficients is then obtained to approximate the result analytically. The offset calibration of the BPMs is done relative to the magnetic axis of the quadrupoles using the beam. This avoids the problem arising from various mechanical sources as well as the offset in the processing electronics. The measurement results for the resolution and long-term drift of the BPM electronics shows 0.06-{mu}m/{radical}Hz resolution and 2-{mu}m/hr drift over a period of 1.5 hrs.

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4 p.

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INIS; OSTI as DE95013732

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  • 16. Institute of Electrical and Electronic Engineers (IEEE) particle accelerator conference, Dallas, TX (United States), 1-5 May 1995

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  • Other: DE95013732
  • Report No.: ANL/ASD/CP--85066
  • Report No.: CONF-950512--274
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 97280
  • Archival Resource Key: ark:/67531/metadc793401

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  • July 1, 1995

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  • Dec. 19, 2015, 7:14 p.m.

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  • Feb. 1, 2016, 1:45 p.m.

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Chung, Y.; Barr, D.; Decker, G.; Evans, K. Jr. & Kahana, E. Sensitivity and offset calibration for the beam position monitors at the Advanced Photon Source, article, July 1, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc793401/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.