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An axicon lens is used to generate HOFI plasma channels with on-axis electron densities as low as $n_e(0) = 1.5\\times 10^{17}\\, \\mathrm{cm}^{-3}$ and matched spot sizes in the range $ 20 \\mu \\mathrm{m} \\lesssim W_M \\lesssim 40 \\mu \\mathrm{m}$. Control of these channel parameters via adjustment of the initial cell pressure and the delay after the arrival of the channel-forming pulse is demonstrated. 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Picksley, A. von Boetticher, C. Arran, C. Thornton, G. Hine, H. M. Milchberg, J. Holloway, J. Jonnerby, L. Corner, R. J. Shalloo, R. Walczak, S. M. Hooker","submitted_at":"2019-02-14T20:28:54Z","abstract_excerpt":"We demonstrate optical guiding of high-intensity laser pulses in long, low density hydrodynamic optical-field-ionized (HOFI) plasma channels. An axicon lens is used to generate HOFI plasma channels with on-axis electron densities as low as $n_e(0) = 1.5\\times 10^{17}\\, \\mathrm{cm}^{-3}$ and matched spot sizes in the range $ 20 \\mu \\mathrm{m} \\lesssim W_M \\lesssim 40 \\mu \\mathrm{m}$. Control of these channel parameters via adjustment of the initial cell pressure and the delay after the arrival of the channel-forming pulse is demonstrated. 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