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TY - CONF
AU - Sahai, A. A.
AU - Katsouleas, T.C.
AU - Muggli, P.
ED - Petit-Jean-Genaz, Christine
ED - Arduini, Gianluigi
ED - Michel, Peter
ED - Schaa, Volker RW
TI - Self-Injection by Trapping of Plasma Electrons Oscillating in Rising Density Gradient at Vacuum-Plasma Interface
J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014
C1 - Dresden, Germany
T2 - International Particle Accelerator Conference
T3 - 5
LA - english
AB - We model the trapping of plasma electrons within the density structures excited by a propagating energy source in a rising plasma density gradient. Rising density gradient leads to spatially contiguous coupled up-chirped plasmons (d{ω²_{pe}(x)}/{dx}>0). Therefore phase mixing between plasmons can lead to trapping until the plasmon field is high enough such that e⁻ trajectories returning towards a longer wavelength see a trapping potential. Rising plasma density gradients are ubiquitous for confining the plasma within sources at the vacuum-plasma interfaces. Therefore trapping of plasma-e⁻ in a rising ramp is important for acceleration diagnostics and to understand the energy dissipation from the excited plasmon train [1]. Down-ramp in density [2][3] has been used for plasma-e⁻ trapping within the first bucket behind the driver. Here, in rising density gradient the trapping does not occur in the first plasmon bucket but in subsequent plasmon buckets behind the driver. Trapping reduces the Hamiltonian of each bucket where e⁻ are trapped, so it is a wakefield-decay probe. Preliminary computational results for beam and laser-driven wakefield are shown.
PB - JACoW
CP - Geneva, Switzerland
SP - 1479
EP - 1482
KW - plasma
KW - laser
KW - electron
KW - injection
KW - wakefield
DA - 2014/07
PY - 2014
SN - 978-3-95450-132-8
DO - 10.18429/JACoW-IPAC2014-TUPME051
UR - http://jacow.org/ipac2014/papers/tupme051.pdf
ER -