Online Measurement and Tuning of Multipass Recirculation Time in the CEBAF Linac

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CEBAF is a recirculating electron accelerator with negligible synchrotron motion of the particles within each bunch. On-crest RF acceleration is used to minimize the time-averaged energy spread of the beam. Previously installed diagnostics** allow us to maintain the relative timing of the beam and the RF, noninvasively compensating for residual drifts of the RF timing system on the first acceleration pass. However, residual setup errors for the path length (recirculation time) and variable path length drift between passes result in relative drifts of beam energy at the 10-4 scale for some passes, even when the energy of any one of ... continued below

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90 Kilobytes pages

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Tiefenback, M.G. June 1, 2001.

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CEBAF is a recirculating electron accelerator with negligible synchrotron motion of the particles within each bunch. On-crest RF acceleration is used to minimize the time-averaged energy spread of the beam. Previously installed diagnostics** allow us to maintain the relative timing of the beam and the RF, noninvasively compensating for residual drifts of the RF timing system on the first acceleration pass. However, residual setup errors for the path length (recirculation time) and variable path length drift between passes result in relative drifts of beam energy at the 10-4 scale for some passes, even when the energy of any one of the recirculation passes is held fixed by adjusting the RF gradient. We have extended the diagnostic system to the higher acceleration passes and can correct the recirculation timing at the scale of hundreds of femtoseconds (tenths of a degree of 1497 MHz RF phase). Variation in the higher-pass beam to RF timing indicates drift in the beam recirculation time. The previous procedure for measuring and tuning the path length required suspension of beam delivery to the users. These actions can now be done without interruption of beam to the experimenters.

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90 Kilobytes pages

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  • PAC 2001, Chicago, IL (US), 06/18/2001--06/22/2001

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  • Report No.: JLAB-ACO-01-01
  • Report No.: DOE/ER/40150-1874
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 783621
  • Archival Resource Key: ark:/67531/metadc723774

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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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  • June 1, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • Feb. 5, 2016, 8:23 p.m.

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Tiefenback, M.G. Online Measurement and Tuning of Multipass Recirculation Time in the CEBAF Linac, article, June 1, 2001; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc723774/: accessed November 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.