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We present experiments and numerical simulations which demonstrate thatfully-ionized, low-density plasma channels could be formed by hydrodynamicexpansion of plasma columns produced by optical field ionization (OFI).Simulations of the hydrodynamic expansion of plasma columns formed in hydrogenby an axicon lens show the generation of \unit[200]{mm} long plasma channelswith axial densities of order $n_e(0) = 1 \times 10^{17} cm^{-3}$ andlowest-order modes of spot size $W_M \approx 40 \mu m$. These simulations showthat the laser energy required to generate the channels is modest: of order 1mJ per centimetre of channel. The simulations are confirmed by experiments witha spherical lens which show the formation of short plasma channels with $1.5\times 10^{17}cm^{-3} \lesssim n_e(0) \lesssim 1 \times 10^{18} cm^{-3}$ and$61 \mu m \gtrsim W_M \gtrsim 33 \mu m$. Low-density plasma channels of thistype would appear to be well-suited as multi-GeV laser-plasma acceleratorstages capable of long-term operation at high pulse repetition rates.

Hydrodynamic, Optically-Field-Ionized (HOFI) Plasma Channels