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Method of Beam Steering with FWM in ICF: Compensation and Generation of a PC Beam for a Foam Target

Nobukazu KAMEYAMA and Hiroki YOSHIDA

Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan

(Received 28 June 2013 / Accepted 18 September 2013 / Published 27 June 2014)

Abstract

In beam steering with a phase conjugate (PC) mirror in inertial fusion energy (ICF), the path of the PC beam has to be compensated since the target moves several hundred micrometers during beam propagation. In this paper we show that compensation can be achieved by adjusting the angle between two pump beams in four-wave mixing (FWM) used as a PC mirror. The compensation angle depends on the target position along the optical axis, focal point of the final optics, and angle adjusted with FWM. For the parameter values of GEKKO XII and an accuracy of laser irradiation of ±10 µm, the compensation angle is 4.5 mrad and the margin of error for target injection is ±0.3 mm. We also show that a PC beam can be generated from the beam scattered by a foam target rotating at ∼ 43 m/s is confirmed.

Copyright (c) 2014 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

beam steering, inertial fusion energy, four-wave mixing, phase conjugate mirror, foam target

DOI: 10.1585/pfr.9.4404102

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References

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This paper may be cited as follows:

Nobukazu KAMEYAMA and Hiroki YOSHIDA, Plasma Fusion Res. 9, 4404102 (2014).