Multi-GeV trapped electron bunches in a plasma wakefield accelerator (PWFA) are observed with normalized transverse emittance divided by peak current, εN,x/It, below the level of 0.2μm/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 εN,x/It result from multi-GeV trapped electron bunches with emittances of a fewμm and multi-kA peak currents.
|Original language||English (US)|
|Journal||Physical Review Special Topics - Accelerators and Beams|
|State||Published - May 14 2009|
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)
- Surfaces and Interfaces