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kalal_icc2010_poster.pdf2010-03-12 06:52:36Milan Kalal
icc2010_kalal_abstract.pdf2009-12-04 16:01:42Milan Kalal

Recent results of the SBS PCM approach to self-navigation of lasers on direct drive IFE pellets

Author: Milan Kalal
Requested Type: Consider for Invited
Submitted: 2009-12-04 15:57:59

Co-authors: H.J.Kong, O.Slezak, J.W.Yoon, J.S.Shin

Contact Info:
Czech Technical University in Prague
Brehova 7
Prague 1, Not releva   11519
Czech Republic

Abstract Text:
Recent progress achieved in the stimulated Brillouin scattering (SBS) phase conjugating mirror (PCM) based inertial fusion energy (IFE) approach proposed recently as an alternative to the IFE classical approach is presented. This technology is of particular importance to the direct drive scheme taking care of automatic self-navigation of every individual laser beam on injected pellets with no need for any final optics adjustment. Conceptual design of one typical laser driver is shown and its features discussed. In comparison with the earlier design [1,2] an upgraded scheme was developed with the low energy illumination laser beam (glint) entering the reactor chamber through the same entrance window as used by the corresponding high energy irradiation laser beam. Results of experimental verification of this improved design are reported. In these experiments for the fist time a complete setup including the pellet (realized by the static steel ball) was employed.
Three distinct stages of this process can be identified.
A) at the right moment (determined by careful tracking) when the injected pellet is approaching its best interaction position a low energy seeding laser pulse (glint - red line) is sent to illuminate the pellet; B) reflected seeding laser pulse is collected by the focusing optics and amplified on its way to the SBS PCM cell; C) amplified pulse is reflected by the SBS PCM cell, amplified once again, converted to higher harmonic (blue line) and automatically aimed at the moving pellet by the target displacement compensation system (TDC) for its final high power irradiation. TDC is a completely passive system having its optical components appropriately designed for every individual channel taking advantage of their index of refraction dependence on the wavelength.

[1] M. Kalal, M. Martinkova, O. Slezak, et al., J. Phys.: Conf. Ser. 112, 032049 (2008) (IFSA 2007)
[2] M. Kalal, H.J. Kong, O. Slezak, J.W. Yoon and M. Martinkova, J. Kor. Phys. Soc. (in print)

Characterization: B2,B5


Princeton University

Innovative Confinement Concepts Workshop
February 16-19, 2010
Princeton, New Jersey

ICC 2010