Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Laser-driven generation of collimated ultra-relativistic positron beams
AU - Sarri, G.
AU - Schumaker, W.
AU - Di Piazza, A.
AU - Poder, K.
AU - Cole, J. M.
AU - Vargas, M.
AU - Doria, D.
AU - Kushel, S.
AU - Dromey, B.
AU - Grittani, G.
AU - Gizzi, L.
AU - Dieckmann, M. E.
AU - Green, A.
AU - Chvykov, V.
AU - Maksimchuk, A.
AU - Yanovsky, V.
AU - He, Z. H.
AU - Hou, B. X.
AU - Nees, J. A.
AU - Kar, S.
AU - Najmudin, Z.
AU - Thomas, A. G. R.
AU - Keitel, C. H.
AU - Krushelnick, K.
AU - Zepf, M.
PY - 2013/12
Y1 - 2013/12
N2 - We report on recent experimental results concerning the generation of collimated (divergence of the order of a few mrad) ultra-relativistic positron beams using a fully optical system. The positron beams are generated exploiting a quantum-electrodynamic cascade initiated by the propagation of a laser-accelerated, ultra-relativistic electron beam through high-Z solid targets. As long as the target thickness is comparable to or smaller than the radiation length of the material, the divergence of the escaping positron beam is of the order of the inverse of its Lorentz factor. For thicker solid targets the divergence is seen to gradually increase, due to the increased number of fundamental steps in the cascade, but it is still kept of the order of few tens of mrad, depending on the spectral components in the beam. This high degree of collimation will be fundamental for further injection into plasma-wakefield afterburners.
AB - We report on recent experimental results concerning the generation of collimated (divergence of the order of a few mrad) ultra-relativistic positron beams using a fully optical system. The positron beams are generated exploiting a quantum-electrodynamic cascade initiated by the propagation of a laser-accelerated, ultra-relativistic electron beam through high-Z solid targets. As long as the target thickness is comparable to or smaller than the radiation length of the material, the divergence of the escaping positron beam is of the order of the inverse of its Lorentz factor. For thicker solid targets the divergence is seen to gradually increase, due to the increased number of fundamental steps in the cascade, but it is still kept of the order of few tens of mrad, depending on the spectral components in the beam. This high degree of collimation will be fundamental for further injection into plasma-wakefield afterburners.
KW - ACCELERATOR
KW - ELECTRONS
KW - PULSES
KW - ENERGY
KW - SYSTEM
U2 - 10.1088/0741-3335/55/12/124017
DO - 10.1088/0741-3335/55/12/124017
M3 - Journal article
VL - 55
JO - Plasma Physics and Controlled Fusion
JF - Plasma Physics and Controlled Fusion
SN - 0741-3335
IS - 12
M1 - 124017
T2 - 40th Conference of the European-Physical-Society on Plasma Physics
Y2 - 1 July 2013 through 5 July 2013
ER -