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Creators/Authors contains: "Sloss, A"

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  1. ; ; ; ; (, Review of Scientific Instruments)
    Pushing the high energy frontier of laser wakefield electron acceleration to 10 GeV and beyond requires extending the propagation of relativistic intensity pulses to ∼1 m in a low density (Ne ∼ 1017 cm−3) plasma waveguide. We present the development and characterization of two types of supersonic gas jets for meter-scale multi-GeV laser wakefield accelerators. The first type is a 30-cm long single-module gas jet, which demonstrates good axial uniformity using hydrogen. The second type is a modular jet composed of multiple 11-cm-long modules. Longitudinal density profile control is demonstrated with a 2-module (22 cm long) hydrogen jet using gas valve trigger timing. A 1.0-m-long jet is then assembled from nine modules, and generation of 1.0-m long hydrogen plasma is demonstrated using a femtosecond Bessel beam. To our knowledge, this is the longest gas jet laser plasma yet generated. 
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    Free, publicly-accessible full text available April 1, 2026
  2. ; ; ; ; ; ; ; ; ; ; et al (, Physics of Plasmas)
    Low-density meter-scale plasma waveguides produced in meter-scale supersonic gas jets have paved the way for recent demonstrations of all-optical multi-gigaelectronvolt laser wakefield acceleration (LWFA). This paper reviews recent advances by the University of Maryland, which have enabled these results, focusing on the development of elongated supersonic gas jets up to ∼1 m in length, experimental and simulation studies of plasma waveguide formation, and a new three-stage model for relativistic pulse propagation dynamics in these waveguides. We also present results from recent LWFA experiments conducted at the Laboratory for Advanced Lasers and Extreme Photonics at Colorado State University demonstrating high charge, low divergence electron bunches to ∼10 GeV, with laser-to-electron beam efficiency of at least ∼30%. 
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    Free, publicly-accessible full text available May 1, 2026