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We demonstrate optical guiding of high-intensity laser pulses in long, lowdensity hydrodynamic optical-field-ionized (HOFI) plasma channels. An axiconlens is used to generate HOFI plasma channels with on-axis electron densitiesas low as $n_e(0) = 1.5\times 10^{17}\, \mathrm{cm}^{-3}$ and matched spotsizes in the range $ 20 \mu \mathrm{m} \lesssim W_M \lesssim 40 \mu\mathrm{m}$. Control of these channel parameters via adjustment of the initialcell pressure and the delay after the arrival of the channel-forming pulse isdemonstrated. For laser pulses with a peak axial intensity of $4 \times10^{17}\, \mathrm{W\,cm}^{-2}$, highly reproducible, high-quality guiding overmore than 14 Rayleigh ranges is achieved at a pulse repetition rate of 5 Hz,limited by the available channel-forming laser and vacuum pumping system.Plasma channels of this type would seem to be well suited to multi-GeV laserwakefield accelerators operating in the quasi-linear regime.

Low-Density Hydrodynamic Optical-Field-Ionized Plasma Channels Generated With An Axicon Lens