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Title: Probing the laser wakefield in underdense plasmas by induced terahertz emission

Terahertz (THz) radiation can be produced from a laser wakefield driven in underdense plasmas in the presence of a transverse DC magnetic field. It is shown that the radiation usually contains a component at the electron plasma frequency and its harmonics when the wakefield is excited at high amplitudes. In the highly nonlinear bubble/blowout regime, the radiation contains a smooth component peaked at the reduced electron plasma frequency and an irregular spectrum extending to tens of the electron plasma frequency. The latter is due to the broken-wave structure behind the bubble. A theoretical model is presented and validated via two-dimensional particle-in-cell simulations. The measurement of such THz emission may provide a diagnostic of the laser wakefield structure.
Authors:
; ; ;  [1] ; ;  [1] ;  [2]
  1. Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, CAS, Beijing 100190 (China)
  2. (Ministry of Education) and Department of Physics, Shanghai Jiao Tong University, Shanghai 200240 (China)
Publication Date:
OSTI Identifier:
22227853
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 8; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BUBBLES; ELECTRONS; HARMONICS; LANGMUIR FREQUENCY; LASER-PRODUCED PLASMA; LASERS; MAGNETIC FIELDS; MATHEMATICAL MODELS; NONLINEAR PROBLEMS; PLASMA DENSITY; PLASMA DIAGNOSTICS; PLASMA SIMULATION; PROBES; THZ RANGE; TWO-DIMENSIONAL CALCULATIONS