Journal
NEW JOURNAL OF PHYSICS
Volume 20, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/aad71a
Keywords
electron-positron plasmas; gamma-ray generation in plasmas; high intensity laser-plasma interactions; angular momentum transfer; radiation-dominated regime
Categories
Funding
- National Basic Research Program of China [2013CBA01504]
- National Key Research and Development Program of China [2018YFA0404802]
- National Natural Science Foundation of China [11721091, 11622547, 11655002]
- Science and Technology Commission of Shanghai Municipality [16DZ2260200]
- Ministry of Science and Technology of China [2014DFG02330]
- Hunan Provincial Natural Science Foundation of China [2017JJ1003]
- Fok Ying-Tong Education Foundation [161007]
- Leverhulme Trust
- China Scholarship Council (CSC)
- UK EPSRC [EP/G056803/1]
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Although several laser-plasma-based methods have been proposed for generating energetic electrons, positrons and gamma-photons, manipulation of their microstructures is still challenging, and their angular momentum control has not yet been achieved. Here, we present and numerically demonstrate an all-optical scheme to generate bright GeV gamma-photon and positron beams with controllable angular momentum by use of two counter-propagating circularly-polarized lasers in a near-critical-density plasma. The plasma acts as a 'switching medium', where the trapped electrons first obtain angular momentum from the drive laser pulse and then transfer it to the gamma-photons via nonlinear Compton scattering. Further through the multiphoton Breit-Wheeler process, dense energetic positron beams are efficiently generated, whose angular momentum can be well controlled by laser-plasma interactions. This opens up a promising and feasible way to produce ultra-bright GeV gamma-photons and positron beams with desirable angular momentum for a wide range of scientific research and applications.
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