Correction of dispersion and the betatron functions in the CEBAF accelerator

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During the commissioning of the CEBAF accelerator, correction of dispersion and momentum compaction, and, to a lesser extent, transverse transfer matrices were essential for robust operation. With changing machine conditions, repeated correction was found necessary. To speed the diagnostic process the authors developed a method which allows one to rapidly track the machine optics. The method is based on measuring the propagation of 30 Hz modulated betatron oscillations downstream of a point of perturbation. Compared to the usual methods of dispersion or difference orbit measurement, synchronous detection of the beam displacement, as measured by beam position monitors, offers significantly improved ... continued below

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485 KILOBYTES pages

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Lebedev, V. A.; Bickley, M.; Schaffner, S.; van Zeijts, J.; Krafft, G. A. & Watson, C. October 1, 1996.

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Description

During the commissioning of the CEBAF accelerator, correction of dispersion and momentum compaction, and, to a lesser extent, transverse transfer matrices were essential for robust operation. With changing machine conditions, repeated correction was found necessary. To speed the diagnostic process the authors developed a method which allows one to rapidly track the machine optics. The method is based on measuring the propagation of 30 Hz modulated betatron oscillations downstream of a point of perturbation. Compared to the usual methods of dispersion or difference orbit measurement, synchronous detection of the beam displacement, as measured by beam position monitors, offers significantly improved speed and accuracy of the measurements. The beam optics of the accelerator was altered to decrease lattice sensitivity at critical points and to simplify control of the betatron function match. The calculation of the Courant-Snyder invariant from signals of each pair of nearby beam position monitors has allowed one to perform on-line measurement and correction of the lattice properties.

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485 KILOBYTES pages

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INIS; OSTI as DE96015328

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  • Other Information: Supercedes report DE96015328; PBD: 1 Oct 1996

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  • Other: DE96015328
  • Report No.: DOE/ER/40150--378
  • Report No.: JLAB-ACC--96-02
  • Report No.: ON:DE96015328
  • Grant Number: AC05-84ER40150
  • DOI: 10.2172/378904 | External Link
  • Office of Scientific & Technical Information Report Number: 378904
  • Archival Resource Key: ark:/67531/metadc681723

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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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  • October 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 17, 2017, 6:29 p.m.

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Lebedev, V. A.; Bickley, M.; Schaffner, S.; van Zeijts, J.; Krafft, G. A. & Watson, C. Correction of dispersion and the betatron functions in the CEBAF accelerator, report, October 1, 1996; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc681723/: accessed November 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.