de.mpg.escidoc.pubman.appbase.FacesBean
English
 
Help Guide Disclaimer Contact us Login
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Excitation of accelerating plasma waves by counter-propagating laser beams

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons60774

Pukhov,  Alexander
Theory, Max Planck Institute of Quantum Optics, Max Planck Society;

Locator
There are no locators available
Fulltext (public)
There are no public fulltexts available
Supplementary Material (public)
There is no public supplementary material available
Citation

Shvets, G., Fisch, N. J., & Pukhov, A. (2002). Excitation of accelerating plasma waves by counter-propagating laser beams. Physics of Plasmas, 9(5), 2383-2392. Retrieved from http://ojps.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PHPAEN000009000005002383000001&idtype=cvips&gifs=Yes.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-C21D-D
Abstract
The conventional approach to exciting high phase velocity waves in plasmas is to employ a laser pulse moving in the direction of the desired particle acceleration. Photon downshifting then causes momentum transfer to the plasma and wave excitation. Novel approaches to plasma wake excitation, colliding-beam accelerator (CBA), which involve photon exchange between the long and short counter-propagating laser beams, are described. Depending on the frequency detuning Δω between beams and duration τL of the short pulse, there are two approaches to CBA. First approach assumes (τL ≈ 2/ωp). Photons exchanged between the beams deposit their recoil momentum in the plasma driving the plasma wake. Frequency detuning between the beams determines the direction of the photon exchange, thereby controlling the phase of the plasma wake. This phase control can be used for reversing the slippage of the accelerated particles with respect to the wake. A variation on the same theme, super-beatwave accelerator, is also described. In the second approach, a short pulse with τL≫ omega(p)(-1) detuned by Deltaomegasimilar to2omega(p) from the counter-propagating beam is employed. While parametric excitation of plasma waves by the electromagnetic beatwave at 2omega(p) of two co-propagating lasers was first predicted by Rosenbluth and Liu [M. N. Rosenbluth and C. S. Liu, Phys. Rev. Lett. 29, 701 (1972)], it is demonstrated that the two excitation beams can be counter-propagating. The advantages of using this geometry (higher instability growth rate, insensitivity to plasma inhomogeneity) are explained, and supporting numerical simulations presented. (C) 2002 American Institute of Physics.