Halo Formation And Emittance Growth of Positron Beams in Plasmas [electronic resource]
Astrophysics,astro.
Saved in:
| Online Access: |
Online Access |
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| Corporate Author: | |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C : Oak Ridge, Tenn. :
United States. Dept. of Energy ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
2011.
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| Subjects: |
| Summary: | Astrophysics,astro. |
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| Abstract: | An ultrarelativistic 28.5 GeV, 700-μm-long positron bunch is focused near the entrance of a 1.4-m-long plasma with a density n{sub e} between ≈10¹³ and ≈5 x 10¹⁴ cm⁻³. Partial neutralization of the bunch space charge by the mobile plasma electrons results in a reduction in transverse size by a factor of ≈3 in the high emittance plane of the beam ≈1 m downstream from the plasma exit. As n{sub e} increases, the formation of a beam halo containing ≈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 ≈3 and emittance ratio of ≈5 suffers emittance growth and exits the plasma with approximately equal sizes and emittances. |
| Item Description: | Published through the Information Bridge: DOE Scientific and Technical Information. 10/25/2011. "slac-pub-14657" Phys.Rev.Lett.101:055001,2008 101 5 ISSN 0031-9007; PRLTAO FT. Walz, D.; Huang, C.; Zhou, M.; Lu, W.; Joshi, C.; Siemann, R.H.; Decker, F.J.; Mori, W.B.; Muggli, P.; Hogan, M.J.; Blue, B.E.; Clayton, C.E.; Katsouleas, Thomas C.; O'Connell, C.L. |
| Physical Description: | 4 pages : digital, PDF file. |