Abstract
We present three possible design options of laser plasma acceleration (LPA) for reaching a
100-GeV level energy by means of a multi-petawatt laser such as the 3.5-kJ, 500-fs PETawatt Aquitane
Laser (PETAL) at French Alternative Energies and Atomic Energy Commission (CEA). Based on scaling of
laser wakefield acceleration in the quasi-linear regime with the normalized vector potential
<i>a</i><sub>0</sub> = 1.4(1.6), acceleration to 100 (130) GeV requires a 30-m-long plasma waveguide
operated at the plasma density <i>n<sub>e</sub></i> ≅ 7 × 10<sup>15</sup> cm<sup>-3</sup> with a
channel depth Δ<i>n/ne</i> = 20%, while a nonlinear laser wakefield accelerator in the bubble regime
with <i>a</i><sub>0</sub> ≥ 2 can reach 100 GeV approximately in a 36/<i>a</i><sub>0</sub>-m-long plasma through self-guiding. The
third option is a hybrid concept that employs a ponderomotive channel created by a long leading
pulse for guiding a short trailing driving laser pulse. The detail parameters for three options are
evaluated, optimizing the operating plasma density at which a given energy gain is obtained over the
dephasing length and the matched conditions for propagation of relativistic laser pulses in plasma
channels, including the self-guiding. For the production of high-quality beams with 1%-level energy
spread and a 1π-mm-mrad level transverse normalized emittance at 100-MeV energy, a simple scheme
based on the ionization-induced injection mechanism may be conceived. We investigate electron beam
dynamics and effects of synchrotron radiation due to betatron motion by solving the beam dynamics
equations on energy and beam radius numerically. For the bubble regime case with <i>a</i><sub>0</sub> = 4, radiative
energy loss becomes 10% at the maximum energy of 90 GeV.
© 2013 Chinese Optics Letters
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