Sep 15 – 21, 2019
Hotel Hermitage, La Biodola Bay, Isola d'Elba, Italy
Europe/Rome timezone

Guiding of high-intensity laser pulses through long, low-density hydrodynamic optical-field-ionised (HOFI) plasma channels

Sep 18, 2019, 7:00 PM
Parking Area (Hotel Hermitage)

Parking Area

Hotel Hermitage

poster WG5 - Plasma devices, plasma and beam diagnostics Cheese and Wine Poster Session 2


Alex Picksley (University of Oxford)


To realise a 10 GeV laser plasma accelerator stage, high-intensity pulses must be guided through low-density ($\sim 1 \times 10^{17} \rm{cm^{-3}}$) plasma over distances of order 100s of millimeters.

We recently presented simulations which showed that plasma channels with these parameters could be generated by the hydrodynamic expansion of optical-field-ionised plasma columns formed with an axicon lens [1], and experiments using a spherical lens which demonstrated the generation of short (~ 4 mm long) low-density channels.

Here we report new experiments which demonstrate the formation of 16-mm-long channels with on axis densities as low as $1.5 \times 10^{17} cm^{-3}$ using an axicon lens [2]. Only 0.5 mJ of channel-forming laser energy was required per mm of channel. The hydrodynamic expansion of the plasma column and the properties of the resulting plasma channels are characterized by transverse interferometry. High-quality, highly reproducible guiding of pulses with peak axial intensities exceeding $4 \times 10^{17} \rm{W cm^{-2}}$ through these channels is demonstrated at a repetition rate of 5 Hz.

We also report progress in using reflective axicons to generate HOFI plasma channels with lengths greater than 100 mm.

[1] Shalloo, R. J., et al. (2018)

[2] Shalloo R. J., et al. (2019)

Primary author

Alex Picksley (University of Oxford)


Aaron Alejo (Queen's University of Belfast) Aimee Ross (University of Oxford) Rob Shalloo (Imperial College London) Simon Hooker (University of Oxford) Howard Milchberg (University of Maryland) James Holloway (The University of Oxford) Laura Corner (Cockcroft Institute, University of Liverpool) Christopher Thornton (STFC) Dr Harry Jones (University of Liverpool) Mr Linus Feder (University of Maryland) Dr George Hine (University of Maryland) Jakob Jonnerby (University of Oxford) Mr Alexander von Boetticher (University of Oxford) Mr James Cowley (University of Oxford) Christopher Arran (University of York) Roman Walczak (University of Oxford)

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