Electromagnetic Emission from Laser Wakefields in Magnetized Underdense Plasmas

HU Zhidan(胡志丹); SHENG Zhengming (盛政明); Ding Wenjun (丁文君); WANG Weimin (王伟民); DONG Quanli (董全力); ZHANG Jie(张杰); et al

doi:10.1088/1009-0630/14/10/04

Plasma Science and Technology > 2012 > 14(10): 874-879. > DOI: 10.1088/1009-0630/14/10/04

HU Zhidan(胡志丹), SHENG Zhengming (盛政明), Ding Wenjun (丁文君), WANG Weimin (王伟民), DONG Quanli (董全力), ZHANG Jie(张杰), et al. Electromagnetic Emission from Laser Wakefields in Magnetized Underdense Plasmas[J]. Plasma Science and Technology, 2012, 14(10): 874-879. DOI: 10.1088/1009-0630/14/10/04

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Electromagnetic Emission from Laser Wakefields in Magnetized Underdense Plasmas

1 Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, CAS, Beijing 100190, China 2 Key Laboratory for Laser Plasmas (Ministry of Education) and Department of Physics, Shanghai Jiaotong University, Shanghai 200240, China

Funds: supported in part by the NSFC (Nos. 10734130, 10925421, and 11075105), the National Basic Research Program of China (Nos. 2007CB310406, 2009GB105002).

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Received Date: June 14, 2011

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Abstract

Abstract

A wakefield driven by a short intense laser pulse in a perpendicularly magnetized underdense plasma is studied analytically and numerically for both weakly relativistic and highly relativistic situations. Owing to the DC magnetic field, a transverse component of the electric fields associated with the wakefield appears, while the longitudinal wave is not greatly affected by the magnetic field up to 22 Tesla. Moreover, the scaling law of the transverse field versus the longitudinal field is derived. One-dimensional particle-in-cell simulation results confirm the analytical results. Wakefield transmission through the plasma-vacuum boundary, where electromagnetic emission into vacuum occurs, is also investigated numerically. These results are useful for the generation of terahertz radiation and the diagnosis of laser wakefields.
- laser wakefield,
- magnetized plasma,
- terahertz radiation,
- particle-in-cell simulation

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