Bulletin of the American Physical Society
65th Annual Meeting of the APS Division of Plasma Physics
Monday–Friday, October 30–November 3 2023; Denver, Colorado
Session JP11: Poster Session IV:
BEAMS: Laser- and beam-plasma interactions
Fundamental: Measurements and analysis in fundamental plasma physics; Plasma Sheaths, Sources, and Shocks
MFE: Turbulence and transport in fusion plasmas; High Field Tokamaks
2:00 PM - 5:00 PM
Tuesday, October 31, 2023
Room: Plaza ABC
Abstract: JP11.00025 : Plasma waveguide generation with diffractive logarithmic axicon*
Presenter:
Nishchal Tripathi
(University of Maryland, College Park)
Authors:
Nishchal Tripathi
(University of Maryland, College Park)
Jaron E Shrock
(University of Maryland, College Park)
Bo Miao
(University of Maryland, College Park)
Ela M Rockafellow
(University of Maryland, College Park)
Howard M Milchberg
(University of Maryland, College Park)
The use of plasma waveguides in Laser Wakefield Acceleration (LWFA) offers a compelling approach for achieving enhanced electron acceleration by enabling extended laser-plasma interaction lengths [1,2]. This poster explores the utilization of a logarithmic diffractive axicon in order to improve the longitudinal uniformity of the plasma and regularize the guiding and acceleration processes in LWFA.
Logarithmic axicons have logarithmically varying radial phase function, engineered based on radial to axial mapping of energy [3]. The spot size of the Bessel-like beam generated through this type of axicon stays nearly constant in an extended focal range but maintains a much more constant intensity than the Bessel beams formed with a classical axicon. We demonstrate fabrication and characterization of a diffractive logarithmic axicon as well as generation of a meter-scale plasma waveguide structure.
References:
1. Feder, L. et al. (2020). Self-waveguiding of relativistic laser pulses in neutral gas channels. Physical Review Research, 2(4).
2. Miao, B. et al. (2022). Multi-GeV Electron Bunches from an All-Optical Laser Wakefield Accelerator. Physical Review X, 12(3).
3. Sochacki, J. et al. (1992). Nonparaxial design of generalized axicons. Applied Optics, 31(25), 5326.
*This work was supported by the U.S. Department of Energy (DE-SC0015516), and the National Science Foundation (PHY1619582 and PHY2010511).
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