Journal
PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS
Volume 12, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevSTAB.12.051302
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Funding
- Department of Energy [DE-AC02-76SF00515, DE-FG02-93ER40745, DE-FG03-92ER40727, DE-FG52-06NA26195, DE-FC02-07ER41500, DE-FG02-03ER54721, DE-FG02-92ER40727]
- National Science Foundation [NSF-Phy-0321345]
- FCT (Portugal)
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Multi-GeV trapped electron bunches in a plasma wakefield accelerator (PWFA) are observed with normalized transverse emittance divided by peak current, epsilon(N,x)/I-t, below the level of 0.2 mu m/kA. A theoretical model of the trapped electron emittance, developed here, indicates that emittance scales inversely with the square root of the plasma density in the nonlinear bubble'' regime of the PWFA. This model and simulations indicate that the observed values of epsilon(N,x)/I-t result from multi-GeV trapped electron bunches with emittances of a few mu m and multi-kA peak currents.
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