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Title: Demonstration of passive plasma lensing of a laser wakefield accelerated electron bunch

We report on the first demonstration of passive all-optical plasma lensing using a two-stage setup. An intense femtosecond laser accelerates electrons in a laser wakefield accelerator (LWFA) to 100 MeV over millimeter length scales. By adding a second gas target behind the initial LWFA stage we introduce a robust and independently tunable plasma lens. We observe a density dependent reduction of the LWFA electron beam divergence from an initial value of 2.3 mrad, down to 1.4 mrad (rms), when the plasma lens is in operation. Such a plasma lens provides a simple and compact approach for divergence reduction well matched to the mm-scale length of the LWFA accelerator. The focusing forces are provided solely by the plasma and driven by the bunch itself only, making this a highly useful and conceptually new approach to electron beam focusing. Possible applications of this lens are not limited to laser plasma accelerators. Since no active driver is needed the passive plasma lens is also suited for high repetition rate focusing of electron bunches. As a result, its understanding is also required for modeling the evolution of the driving particle bunch in particle driven wake field acceleration.
 [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [3] ;  [2] ;  [3] ;  [4] ;  [5] ;  [3] ;  [6] ;  [7] ;  [7] ;  [8] ;  [3] ;  [7] ;  [1] ;  [9] ;  [10]
  1. Friedrich-Schiller-Univ. of Jena, Jena (Germany); Helmholtz Institute Jena, Jena (Germany)
  2. Univ. of Hamburg, Hamburg (Germany)
  3. Friedrich-Schiller-Univ. of Jena, Jena (Germany)
  4. Friedrich-Schiller-Univ. of Jena, Jena (Germany); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  5. Helmholtz Institute Jena, Jena (Germany)
  6. Helmholtz Institute Jena, Jena (Germany); Univ. of Jena, Jena (Germany)
  7. Ludwig-Maximilians-Univ. Munchen, Garching (Germany)
  8. Queens Univ., Belfast (United Kingdom)
  9. Univ. of Hamburg, Hamburg (Germany); Univ. of Strathclyde, Glasgow (United Kingdom)
  10. Friedrich-Schiller-Univ. of Jena, Jena (Germany); Helmholtz Institute Jena, Jena (Germany); Queens Univ., Belfast (United Kingdom)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 2469-9888; PRABFM
Grant/Contract Number:
TR18-B9; KA 2869/2-1; 05K10SJ2; 03ZIK052; 05K16SJC; AC02-76SF00515
Accepted Manuscript
Journal Name:
Physical Review Accelerators and Beams (Online)
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams (Online); Journal Volume: 19; Journal Issue: 7; Journal ID: ISSN 2469-9888
American Physical Society (APS)
Research Org:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States