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1.
Investigation of ionization-induced electron injection in a wakefield driven by laser inside a gas cell. / Audet, T. L. (LPGP, Orsay) ; Hansson, M. (Lund U.) ; Lee, P. (LPGP, Orsay) ; Desforges, F. G. (LPGP, Orsay) ; Maynard, G. (LPGP, Orsay) ; Dobosz Dufrenoy, S. (Saclay) ; Lehe, R. (LBNL, Berkeley) ; Vay, J.-L. (LBNL, Berkeley) ; Aurand, B. (Lund U.) ; Persson, A. (Lund U.) et al.
Ionization-induced electron injection was investigated experimentally by focusing a driving laser pulse with a maximum normalized potential of 1.2 at different positions along the plasma density profile inside a gas cell, filled with a gas mixture composed of 99%H2 þ 1%N2. Changing the laser focus position relative to the gas cell entrance controls the accelerated electron bunch properties, such as the spectrum width, maximum energy, and accelerated charge. [...]
CERN-ACC-2016-0090.- Geneva : CERN, 2016 - Published in : Phys. Plasmas 23 (2016) 023110
2.
Localization of ionization-induced trapping in a laser wakefield accelerator using a density down-ramp / Hansson, M. (Lund U.) ; Audet, T. L. (LPGP, Orsay) ; Ekerfelt, H. (Lund U.) ; Aurand, B. (Lund U.) ; Gallardo Ganzalez, I. (Lund U.) ; Desforges, F. G. (LPGP, Orsay) ; Davoine, X. (CEA DAM) ; Maitrallain, A. (Saclay) ; Reymond, S. (Lund U. ; ENSTA, Paris) ; Monot, P. (Saclay) et al.
We report on a study on controlled trapping of electrons, by field ionization of nitrogen ions, in laser wakefield accelerators in variable length gas cells. In addition to ionization-induced trapping in the density plateau inside the cells, which results in wide, but stable, electron energy spectra, a regime of ionization-induced trapping localized in the density down-ramp at the exit of the gas cells, is found. [...]
CERN-ACC-2016-0050.- Geneva : CERN, 2016 - Published in : Plasma Phys. Control. Fusion 58 (2016) 055009 Fulltext: PDF;
3.
Enhanced stability of laser wakefield acceleration using dielectric capillary tubes / Hannson, M (Lund U.) ; Senje, L (Lund U.) ; Persson, A (Lund U.) ; Lundh, O (Lund U.) ; Wahlström, C-G (Lund U.) ; Desforges, F G (LPGP, Orsay) ; Ju, J (LPGP, Orsay) ; Audet, T L (LPGP, Orsay) ; Cros, B (LPGP, Orsay) ; Dobosz Dufrenoy, S (Saclay) et al.
The stability of beams of laser wakefield accelerated electrons in dielectric capillary tubes is experimentally investigated. These beams are found to be more stable in charge and pointing than the corresponding beams of electrons accelerated in a gas jet. [...]
CERN-ACC-2014-0048.- Geneva : CERN, 2014 - Published in : 10.1103/PhysRevSTAB.17.031303 Fulltext: PDF;

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