Impact of zero order unconverted light on beam pointing

Technical Report · Tue Aug 24 04:00:00 EDT 1999

DOI:https://doi.org/10.2172/13900· OSTI ID:13900

Dixit, S ^[1]; Kalantar, D; Lyons, R

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1. LLNL

There is a significant amount of unconverted light incident in the NIF target chamber. The baseline plan for managing this light is to use a sub-aperture CSG design. This CSG selection impacts the target chamber and near-opposing FOAs due to: (1) zero order unconverted light footprint, and (2) high order dispersed unconverted light. In this memo we describe the impact of the zero order light on the range of beam pointing for individual beams. We show that zero order footprint for 1w light enters into the near-opposite FOAs for several ports if the beams are pointed away from the target chamber center. Additionally, for the case where 3w is allowed to propagate past target chamber center, the converted light may enter into the near-opposite FOAs. The second aperture in the PAM is required to protect the FOAs and still accommodate offset beam pointing on NIF. We present details on the aperture requirements to accommodate a range of beam pointing.

• Research Organization: Lawrence Livermore National Lab., CA (US)
• Sponsoring Organization: USDOE Office of Defense Programs (DP) (US)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 13900
• Report Number(s): UCRL-ID-135816; DP0210000; DP0210000
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
APERTURES
BEAM POSITION
DESIGN
LASER RADIATION
TARGET CHAMBERS
US NATIONAL IGNITION FACILITY