Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Characterization of transverse beam emittance of electrons from a laser-plasma wakefield accelerator in the bubble regime using betatron x-ray radiation
AU - Kneip, S.
AU - McGuffey, C.
AU - Martins, J. L.
AU - Bloom, M. S.
AU - Chvykov, V.
AU - Dollar, F.
AU - Fonseca, R.
AU - Jolly, S.
AU - Kalintchenko, G.
AU - Krushelnick, K.
AU - Maksimchuk, A.
AU - Mangles, S. P. D.
AU - Najmudin, Z.
AU - Palmer, C. A. J.
AU - Phuoc, K. Ta
AU - Schumaker, W.
AU - Silva, L. O.
AU - Vieira, J.
AU - Yanovsky, V.
AU - Thomas, A. G. R.
PY - 2012/2/2
Y1 - 2012/2/2
N2 - We propose and use a technique to measure the transverse emittance of a laser-wakefield accelerated beam of relativistic electrons. The technique is based on the simultaneous measurements of the electron beam divergence given by v(perpendicular to)/v(parallel to), the measured spectrum gamma, and the transverse electron bunch size in the bubble r(perpendicular to). The latter is obtained via the measurement of the source size of the x rays emitted by the accelerating electron bunch in the bubble. We measure a normalized rms beam transverse emittance <0.5 pi mm mrad as an upper limit for a spatially Gaussian, spectrally quasimonoenergetic electron beam with 230 MeV energy in agreement with numerical modeling and analytic theory in the bubble regime.
AB - We propose and use a technique to measure the transverse emittance of a laser-wakefield accelerated beam of relativistic electrons. The technique is based on the simultaneous measurements of the electron beam divergence given by v(perpendicular to)/v(parallel to), the measured spectrum gamma, and the transverse electron bunch size in the bubble r(perpendicular to). The latter is obtained via the measurement of the source size of the x rays emitted by the accelerating electron bunch in the bubble. We measure a normalized rms beam transverse emittance <0.5 pi mm mrad as an upper limit for a spatially Gaussian, spectrally quasimonoenergetic electron beam with 230 MeV energy in agreement with numerical modeling and analytic theory in the bubble regime.
U2 - 10.1103/PhysRevSTAB.15.021302
DO - 10.1103/PhysRevSTAB.15.021302
M3 - Journal article
VL - 15
JO - Physical Review Special Topics: Accelerators and Beams
JF - Physical Review Special Topics: Accelerators and Beams
SN - 1098-4402
IS - 2
M1 - 021302
ER -