1. Measurement of Forward Raman Scattering and Electron Acceleration from High-Intensity Laser--Plasma Interactions at 527 nm
- Author
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Najmudin, Z., Allott, R., Amiranoff, F., Clark, E. L., Danson, C. N., Gordon, Daniel F., Joshi, C., Krushelnick, K., Malka, V., Neely, D., Salvati, M. R., Santala, M. I. K., Tatarakis, M., and Dangor, A. E.
- Subjects
Laser-plasma interactions -- Measurement ,Raman effect -- Measurement ,Electron accelerators -- Usage ,Plasma waves -- Analysis ,Business ,Chemistry ,Electronics ,Electronics and electrical industries - Abstract
High-intensity laser-plasma interaction experiments were performed using high-power laser pulses (greater than 8 TW) at a wavelength of 527 nm. These pulses were focused to intensity greater than [10.sup.18] W/[cm.sup.2] into underdense helium plasma at a density of [n.sub.e] [is less than or equal to] 5 x [10.sup.19] [cm.sup.-3]. Systematic examination of the forward Raman scattering instability was performed by measuring the spectrum of the forward scattered light. It was found that the three-wave instability occurs first, which then proceeds to a nonlinear regime involving four-wave processes. Measurements of the accelerated electron spectrum suggest that higher phase velocity plasma waves are generated than when using lower frequency light. Index Terms--Electron accelerator, electromagnetic scattering by plasma media, plasma waves.
- Published
- 2000