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Abstract
Nonthermal acceleration of relativistic electrons due to the wakefield induced by an intense light pulse is investigated. The spectra of the cosmic rays are well represented by powerlaw. Wakefield acceleration has been considered as a candidate for the origins of cosmic rays. The wakefield can be excited by an intense laser pulse as largeamplitude precursor waves in collisionless shocks in the universe. National Central University (NCU) 100TW laser facility in Taiwan is able to provide highrepetition rate and short intense laser. To experimentally study the wakefield acceleration for the spectrum of the cosmic rays, particleincell simulations are performed to calculate the energy distribution functions of electrons in fixed laser conditions with various plasma densities. The transitions of wakefields from coherent to inherent are observed as the plasma density increases. The distribution functions indicate that the smooth nonthermal powerlaw spectra with an index of −2 appear when the incoherent wakefields are excited. In contrast, the monopeak appear in the spectra when the coherent wakefields are excited. The incoherent wakefields yielding the powerlaw spectra imply the stochastic accelerating of electrons. To explain the universal nonthermal powerlaw spectra with an index of −2, we described and extended the stochastic acceleration model based on Fokker–Planck equation by assuming the transition rate as an exponential function.
Original language  English 

Pages (fromto)  4650 
Number of pages  5 
Journal  High Energy Density Physics 
Volume  22 
DOIs  
State  Published  1 Mar 2017 
Keywords
 Cosmic rays
 High intense laser
 Laboratory astrophysics
 Nonthermal acceleration
 Particleincell simulation
 Wakefield acceleration
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Dive into the research topics of 'Transition from coherent to incoherent acceleration of nonthermal relativistic electron induced by an intense light pulse'. Together they form a unique fingerprint.Projects
 2 Finished

Experimental Investigations of Shock Surface Perturbations in Laser Produced Plasmas(1/3)
Chu, H.H. (PI)
1/08/16 → 31/07/17
Project: Research

Theoretical and Computational Study of Collisional Plasmas(2/3)
Chen, S.H. (PI)
1/08/16 → 31/07/17
Project: Research