Estimates of energy fluence at the focal plane in beams undergoing neutralized drift compression

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The authors estimate the energy fluence (energy per unit area) at the focal plane of a beam undergoing neutralized drift compression and neutralized solenoidal final focus, as is being carried out in the Neutralized Drift Compression Experiment (NDCX) at LBNL. In these experiments, in order to reach high beam intensity, the beam is compressed longitudinally by ramping the beam velocity (i.e. introducing a velocity tilt) over the course of the pulse, and the beam is transversely focused in a high field solenoid just before the target. To remove the effects of space charge, the beam drifts in a plasma. The ... continued below

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Barnard, J.J.; Seidl, P.A.; Coleman, J.E.; Ogata, D. & Welch, D.R. September 2, 2008.

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The authors estimate the energy fluence (energy per unit area) at the focal plane of a beam undergoing neutralized drift compression and neutralized solenoidal final focus, as is being carried out in the Neutralized Drift Compression Experiment (NDCX) at LBNL. In these experiments, in order to reach high beam intensity, the beam is compressed longitudinally by ramping the beam velocity (i.e. introducing a velocity tilt) over the course of the pulse, and the beam is transversely focused in a high field solenoid just before the target. To remove the effects of space charge, the beam drifts in a plasma. The tilt introduces chromatic aberrations, with different slices of the original beam having different radii at the focal plane. The fluence can be calculated by summing the contribution from the various slices. They develop analytic formulae for the energy fluence for beams that have current profiles that are initially constant in time. They compare with envelope and particle-in-cell calculations. The expressions derived are useful for predicting how the fluence scales with accelerator and beam parameters.

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  • 2008 International Linear Accelerator Conference, LINAC08, Victoria, Canada

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  • Report No.: LBNL-1406E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 946464
  • Archival Resource Key: ark:/67531/metadc893561

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • September 2, 2008

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 18, 2016, 4:26 p.m.

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Barnard, J.J.; Seidl, P.A.; Coleman, J.E.; Ogata, D. & Welch, D.R. Estimates of energy fluence at the focal plane in beams undergoing neutralized drift compression, article, September 2, 2008; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc893561/: accessed January 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.