Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session TO08: Beams: X-Ray Sources and X-Ray Diagnostics
9:30 AM–12:30 PM,
Thursday, October 20, 2022
Room: 402 ABC
Chair: Matthew Edwards, Lawrence Livermore Natl Lab
Abstract: TO08.00005 : Bright and stable betatron beams from various injection schemes in laser-driven plasma wakefield*
10:18 AM–10:30 AM
Presenter:
Harsh Harsh
(Helmholtz Institute Jena, Germany)
Authors:
Harsh Harsh
(Helmholtz Institute Jena, Germany)
Daniel Ullman
(Helmholtz Institute Jena)
Felipe Cezar Salgado
(University of Jena, Germany)
Andreas Seidel
(University of Jena, Germany)
Alexander Sävert
(Helmholtz Institute Jena, Germany)
Georg Schaefer
(University of Jena, Germany)
Ingo Uschmann
(University of Jena, Germany)
Matt Zepf
(University of Jena, Germany)
By implementing shock-induced density down-ramp injection and by rotating this shockfront with respect to the laser axis simulations show a shift in the injection angle, which was anticipated to be observable in the Betatron radiation. We also produce quasi monoenergetic electron beams with ~40pC charge, <10 mrad divergence and ΔE/E <10% through this scheme. This was achieved by using Jet-Blade assembly (with He+N2 (95% + 5%) mixture) and by varying the shock profile, position, angle and the blade coverage of the 5mm gas jet.
In a second experiment, Betatron beams from ionisation injection in a gas cell were produced. We observe a peak brightness of ~1023 [Photons/(s.mm2.mrad2.0.1%BW)], with ~1 µm source size using the ionisation injection method, outweighing any advantages from the off-axis injection approach discussed above. A gas cell with a 10 mm acceleration length (H2+N2 (95% + 5%) mixture) was used. We compare the Betatron characteristics from different injection schemes (shock, ionisation and off-axis shock injection).
*The authors acknowledge the funding from ESF, EU and Freistaat Thüringen
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