Developing beam phasing on the Nova laser

Robert B. Ehrlich; Peter A. Amendt; Sham N. Dixit; Bruce A. Hammel; Daniel H. Kalantar; Deanna Marie Pennington; Timothy L. Weiland

doi:10.1117/12.294262

8 December 1997 Developing beam phasing on the Nova laser

Robert B. Ehrlich, Peter A. Amendt, Sham N. Dixit, Bruce A. Hammel, Daniel H. Kalantar, Deanna Marie Pennington, Timothy L. Weiland

Author Affiliations +

Proceedings Volume 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference; (1997) https://doi.org/10.1117/12.294262
Event: Second International Conference on Solid State Lasers for Application to ICF, 1996, Paris, France

Abstract

We are presently adding the capability to irradiate indirectly-driven Nova targets with two rings of illumination inside each end of the hohlraum for studies of time-dependent second Legendre (P₂) and time-integrated fourth Legendre (P₄) flux asymmetry control. The rings will be formed with specially designed kinoform phase plates, which will direct each half of each beam into two separate rings that are nearly uniform azimuthally. The timing and temporal pulse shape of the outer rings will be controlled independently from those of the inner rings, allowing for phasing of the pulse shapes to control time dependent asymmetry. Modifications to the incident beam diagnostics will enable us to verify that acceptable levels of power balance among the contributing segments of each ring have been achieved on each shot. Current techniques for precision beam pointing and timing are expected to be sufficiently accurate for these experiments. We present a design for an affordable retrofit to achieve beam phasing on Nova, results of a simplified demonstration, and calculations highlighting the anticipated benefits.

Citation Download Citation

Robert B. Ehrlich, Peter A. Amendt, Sham N. Dixit, Bruce A. Hammel, Daniel H. Kalantar, Deanna Marie Pennington, and Timothy L. Weiland "Developing beam phasing on the Nova laser", Proc. SPIE 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, (8 December 1997); https://doi.org/10.1117/12.294262

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