Journal
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
Volume 175, Issue -, Pages 49-55Publisher
SPRINGER HEIDELBERG
DOI: 10.1140/epjst/e2009-01116-5
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Funding
- China NNSF [10425416, 1073413]
- National Basic Research Program of China [2007CB310406, 2007CB815105]
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Numerical studies are conducted on the electron injection into the first acceleration bucket of a laser wake field by a weak counter-propagating laser pulse. It is shown that there are two injection mechanisms involved during the colliding laser interaction, the collective injection and stochastic injection. They are caused by the time-averaged ponderomotive force push and stochastic acceleration in the interfering fields, respectively. The threshold amplitude of the injection laser pulse is estimated for the occurrence of electron injection, which is close to that for stochastic acceleration and depends weakly upon the plasma density. The trapping of a large number of injection electrons can result in significant decay of the laser wake field behind the first wave bucket.
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