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APS » Journals » Phys. Rev. Lett. » Volume 94 » Issue 11
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Phys. Rev. Lett. 94, 115003 (2005) [4 pages]

Spatially Localized Self-Injection of Electrons in a Self-Modulated Laser-Wakefield Accelerator by Using a Laser-Induced Transient Density Ramp

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T.-Y. Chien1,2, C.-L. Chang1, C.-H. Lee3, J.-Y. Lin4, J. Wang1,2,5, and S.-Y. Chen1
1Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan
2Graduate Institute of Electro-Optical Engineering, National Taiwan University, Taipei 106, Taiwan
3Research Center for Applied Sciences, Academia Sinica, Taipei 115, Taiwan
4Department of Physics, National Chung Cheng University, Chia-Yi 621, Taiwan
5Department of Electrical Engineering, National Taiwan University, Taipei 106, Taiwan

Received 16 August 2004; published 24 March 2005

By using a laser-induced transient density ramp, we demonstrate self-injection of electrons in a self-modulated laser-wakefield accelerator with spatial localization. The number of injected electrons reaches 1.7×108. The transient density ramp is produced by a prepulse propagating transversely to drill a density depression channel via ionization and expansion. The same mechanism of injection with comparable efficiency is also demonstrated with a transverse plasma waveguide driven by Coulomb explosion.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.115003
DOI:
10.1103/PhysRevLett.94.115003
PACS:
52.38.Kd, 52.35.Mw, 52.38.Mf
 
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