Abstract:
:Plasma wakefield accelerators have been used to accelerate electron and positron particle beams with gradients that are orders of magnitude larger than those achieved in conventional accelerators. In addition to being accelerated by the plasma wakefield, the beam particles also experience strong transverse forces that may disrupt the beam quality. Hollow plasma channels have been proposed as a technique for generating accelerating fields without transverse forces. Here we demonstrate a method for creating an extended hollow plasma channel and measure the wakefields created by an ultrarelativistic positron beam as it propagates through the channel. The plasma channel is created by directing a high-intensity laser pulse with a spatially modulated profile into lithium vapour, which results in an annular region of ionization. A peak decelerating field of 230 MeV m(-1) is inferred from changes in the beam energy spectrum, in good agreement with theory and particle-in-cell simulations.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Gessner S,Adli E,Allen JM,An W,Clarke CI,Clayton CE,Corde S,Delahaye JP,Frederico J,Green SZ,Hast C,Hogan MJ,Joshi C,Lindstrøm CA,Lipkowitz N,Litos M,Lu W,Marsh KA,Mori WB,O'Shea B,Vafaei-Najafabadi N,Walz D,Ydoi
10.1038/ncomms11785subject
Has Abstractpub_date
2016-06-02 00:00:00pages
11785issn
2041-1723pii
ncomms11785journal_volume
7pub_type
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