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Proceedings Paper

laser guiding in plasma channels for high-rep-rate, low-plasma-density LWFAs (Conference Presentation)

Paper Abstract

Laser-driven plasma accelerators operating in a quasi-linear regime require external guiding of the laser driver. We describe our work to develop hydrodynamic optical-field-ionized (HOFI) channels with properties which are well suited to all types of laser-driven plasma accelerator. In this approach a plasma channel is formed by hydrodynamic expansion of a plasma column formed by OFI with elliptically-polarized laser pulses; since the electron energies generated with OFI are independent of the gas density, channels can be formed with much lower axial densities than is possible with collisional heating. An attractive feature of HOFI channels is that they are free-standing, and hence they could operate at high-repetition rates for extended periods. We present simulations which demonstrate the possibility of forming plasma channels 100s of millimetres long, with axial densities of order 10^{17} cm^{-3} and lowest-order modes of spot size of order 40 um. We also present recent experimental results which confirm the formation of HOFI channels with properties similar to those predicted by simulations.

Paper Details

Date Published: 14 May 2019
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Proc. SPIE 11037, Laser Acceleration of Electrons, Protons, and Ions V, 110370J (14 May 2019); doi: 10.1117/12.2522065
Show Author Affiliations
Simon M. Hooker, Univ. of Oxford (United Kingdom)
Christopher Arran, Univ. of Oxford (United Kingdom)
Alexander von Boetticher, Univ. of Oxford (United Kingdom)
Laura Corner, Univ. of Liverpool (United Kingdom)
George Hine, Univ. of Maryland, College Park (United States)
James Holloway, Univ. of Oxford (United Kingdom)
Jakob Jonnerby, Univ. of Oxford (United Kingdom)
Howard Milchberg, Univ. of Maryland, College Park (United States)
Alex Picksley, Univ. of Oxford (United Kingdom)
Robert Shalloo, Univ. of Oxford (United Kingdom)
Christopher Thornton, STFC Rutherford Appleton Lab. (United Kingdom)
Roman Walczak, Univ. of Oxford (United Kingdom)


Published in SPIE Proceedings Vol. 11037:
Laser Acceleration of Electrons, Protons, and Ions V
Eric Esarey; Carl B. Schroeder; Jörg Schreiber, Editor(s)

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