Measuring and Controlling Energy Spread in CEBAF

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As compared to the electron storage rings, one advantage of recirculating linacs is that the beam properties at a target are no longer dominated by the equilibrium between quantum radiative diffusion and radiation damping because new beam is continually injected into the accelerator. This allows the energy spread from a CEBAF-type machine to be relatively small; the measured energy spread from CEBAF at 4 GeV is less than 100 parts per million accumulated over times of order several days. In this paper, the various subsystems contributing to the energy spread of a CEBAF-type accelerators are reviewed, as well as the ... continued below

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146 Kilobytes pages

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Krafft, G.; Denard, J.-C.; Dickson, R.; Kazimi, R.; Lebedev, V. & M.Tiefenback August 1, 2000.

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As compared to the electron storage rings, one advantage of recirculating linacs is that the beam properties at a target are no longer dominated by the equilibrium between quantum radiative diffusion and radiation damping because new beam is continually injected into the accelerator. This allows the energy spread from a CEBAF-type machine to be relatively small; the measured energy spread from CEBAF at 4 GeV is less than 100 parts per million accumulated over times of order several days. In this paper, the various subsystems contributing to the energy spread of a CEBAF-type accelerators are reviewed, as well as the machine diagnostics and controls that are used in CEBAF to ensure that a small energy spread is provided during routine running. Examples of relevant developments are (1) stable short bunches emerging from the injector, (2) precision timing and phasing of the linacs with respect to the centroid of the beam bunches on all passes, (3) implementing 2 kHz sampling rate feedback systems for final energy stabilization, and (4) continuous beam energy spread monitoring with optical transition radiation devices. We present measurement results showing that small energy spreads are achieved over extended periods.

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146 Kilobytes pages

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  • Linac 2000, Monterey, CA (US), 08/21/2000--08/25/2000

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  • Report No.: JLAB-ACC-00-13
  • Report No.: JLAB-ACP-00-05
  • Report No.: physics/0009087
  • Report No.: DOE/ER/40150-1777
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 769168
  • Archival Resource Key: ark:/67531/metadc721636

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  • August 1, 2000

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  • Sept. 29, 2015, 5:31 a.m.

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  • Feb. 5, 2016, 8:17 p.m.

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Krafft, G.; Denard, J.-C.; Dickson, R.; Kazimi, R.; Lebedev, V. & M.Tiefenback. Measuring and Controlling Energy Spread in CEBAF, article, August 1, 2000; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc721636/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.