Halo Formation And Emittance Growth of Positron Beams in Plasmas

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An ultrarelativistic 28.5 GeV, 700-{micro}m-long positron bunch is focused near the entrance of a 1.4-m-long plasma with a density n{sub e} between {approx}10{sup 13} and {approx}5 x 10{sup 14} cm{sup -3}. Partial neutralization of the bunch space charge by the mobile plasma electrons results in a reduction in transverse size by a factor of {approx}3 in the high emittance plane of the beam {approx}1 m downstream from the plasma exit. As n{sub e} increases, the formation of a beam halo containing {approx}40% of the total charge is observed, indicating that the plasma focusing force is nonlinear. Numerical simulations confirm these ... continued below

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4 pages

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Muggli, P.; U., /Southern California; Blue, B.E.; Clayton, C.E.; /UCLA; Decker, F.J. et al. October 25, 2011.

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An ultrarelativistic 28.5 GeV, 700-{micro}m-long positron bunch is focused near the entrance of a 1.4-m-long plasma with a density n{sub e} between {approx}10{sup 13} and {approx}5 x 10{sup 14} cm{sup -3}. Partial neutralization of the bunch space charge by the mobile plasma electrons results in a reduction in transverse size by a factor of {approx}3 in the high emittance plane of the beam {approx}1 m downstream from the plasma exit. As n{sub e} increases, the formation of a beam halo containing {approx}40% of the total charge is observed, indicating that the plasma focusing force is nonlinear. Numerical simulations confirm these observations. The bunch with an incoming transverse size ratio of {approx}3 and emittance ratio of {approx}5 suffers emittance growth and exits the plasma with approximately equal sizes and emittances.

Physical Description

4 pages

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  • Journal Name: Phys.Rev.Lett.101:055001,2008; Journal Volume: 101; Journal Issue: 5

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  • Report No.: SLAC-PUB-14657
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 1028122
  • Archival Resource Key: ark:/67531/metadc835446

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  • October 25, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Nov. 28, 2016, 7:33 p.m.

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Muggli, P.; U., /Southern California; Blue, B.E.; Clayton, C.E.; /UCLA; Decker, F.J. et al. Halo Formation And Emittance Growth of Positron Beams in Plasmas, article, October 25, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc835446/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.