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Title: Efficient laser-driven proton acceleration from cylindrical and planar cryogenic hydrogen jets

We report on recent experimental results deploying a continuous cryogenic hydrogen jet as a debris-free, renewable laser-driven source of pure proton beams generated at the 150 TW ultrashort pulse laser Draco. Efficient proton acceleration reaching cut-off energies of up to 20 MeV with particle numbers exceeding 109 particles per MeV per steradian is demonstrated, showing for the first time that the acceleration performance is comparable to solid foil targets with thicknesses in the micrometer range. Two different target geometries are presented and their proton beam deliverance characterized: cylindrical (Ø 5 μm) and planar (20 μm × 2 μm). In both cases typical Target Normal Sheath Acceleration emission patterns with exponential proton energy spectra are detected. Significantly higher proton numbers in laser-forward direction are observed when deploying the planar jet as compared to the cylindrical jet case. As a result, this is confirmed by two-dimensional Particle-in-Cell (2D3V PIC) simulations, which demonstrate that the planar jet proves favorable as its geometry leads to more optimized acceleration conditions.
Authors:
ORCiD logo [1] ;  [2] ;  [1] ;  [3] ;  [3] ;  [1] ;  [1] ; ORCiD logo [3] ;  [4] ;  [5] ; ORCiD logo [5] ;  [1] ;  [1] ; ORCiD logo [3] ;  [6] ;  [1] ;  [7] ;  [5] ;  [1] ;  [1] more »;  [3] ;  [1] ;  [5] ;  [8] ; ORCiD logo [1] ;  [1] ;  [7] ;  [7] ;  [3] ; ORCiD logo [3] ;  [5] ;  [1] « less
  1. Helmholtz-Zentrum Dresden - Rossendorf, Dresden (Germany)
  2. European XFEL GmbH, Schenefeld (Germany); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Helmholtz-Zentrum Dresden - Rossendorf, Dresden (Germany); Technische Univ. Dresden, Dresden (Germany)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of Alberta, Edmonton, AB (Canada)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  6. Leibniz Institute of Photonic Technology e.V., Jena (Germany)
  7. Univ. Rostock, Rostock (Germany)
  8. SLAC National Accelerator Lab., Menlo Park, CA (United States); Friedrich-Schiller-Univ. Jena, Jena (Germany)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Laser-produced plasmas; Plasma-based accelerators
OSTI Identifier:
1394087