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14 May 2019 laser guiding in plasma channels for high-rep-rate, low-plasma-density LWFAs (Conference Presentation)
Simon M. Hooker, Christopher Arran, Alexander von Boetticher, Laura Corner, George Hine, James Holloway, Jakob Jonnerby, Howard Milchberg, Alex Picksley, Robert Shalloo, Christopher Thornton, Roman Walczak
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Proceedings Volume 11037, Laser Acceleration of Electrons, Protons, and Ions V; 110370J (2019) https://doi.org/10.1117/12.2522065
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic
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.
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Simon M. Hooker, Christopher Arran, Alexander von Boetticher, Laura Corner, George Hine, James Holloway, Jakob Jonnerby, Howard Milchberg, Alex Picksley, Robert Shalloo, Christopher Thornton, and Roman Walczak "laser guiding in plasma channels for high-rep-rate, low-plasma-density LWFAs (Conference Presentation)", Proc. SPIE 11037, Laser Acceleration of Electrons, Protons, and Ions V, 110370J (14 May 2019); https://doi.org/10.1117/12.2522065
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KEYWORDS
Plasma
Channel projecting optics
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