TY - JOUR

T1 - Ionization injection effects in x-ray spectra generated by betatron oscillations in a laser wakefield accelerator

AU - Behm, K. T.

AU - Zhao, T. Z.

AU - Cole, J. M.

AU - Maksimchuk, A.

AU - Mangles, S. P. D.

AU - Nees, J.

AU - Wood, J. C.

AU - Yanovsky, V.

AU - Krushelnick, K.

AU - Thomas, A. G. R.

PY - 2016/5

Y1 - 2016/5

N2 - Single photon counting techniques were used with an x-ray CCD camera to measure features of synchrotron-like x-ray spectra generated by betatron oscillations of electrons in a laser wakefield accelerator (LWFA) with different injection techniques. Measurements were made using the Hercules laser system at the University of Michigan. With a single stage gas cell, we demonstrate that pure helium gas in our wakefield accelerator will produce spectra with higher critical energies than when helium mixed with nitrogen is used. This result was not evident when a two stage gas cell was used.

AB - Single photon counting techniques were used with an x-ray CCD camera to measure features of synchrotron-like x-ray spectra generated by betatron oscillations of electrons in a laser wakefield accelerator (LWFA) with different injection techniques. Measurements were made using the Hercules laser system at the University of Michigan. With a single stage gas cell, we demonstrate that pure helium gas in our wakefield accelerator will produce spectra with higher critical energies than when helium mixed with nitrogen is used. This result was not evident when a two stage gas cell was used.

KW - betatron

KW - x-ray

KW - laser wakefield acceleration

KW - ionization injection

KW - ELECTRON-BEAMS

U2 - 10.1088/0741-3335/58/5/055012

DO - 10.1088/0741-3335/58/5/055012

M3 - Journal article

VL - 58

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 5

M1 - 055012

ER -