학술논문
Spatio-temporal focal spot characterization and modeling of the NIF ARC kilojoule picosecond laser.
Document Type
Academic Journal
Author
Williams WH; Crane JK; Alessi DA; Boley CD; Bowers MW; Conder AD; Di Nicola JG; Di Nicola P; Haefner C; Halpin JM; Hamamoto MY; Heebner JE; Hermann MR; Herriot SI; Homoelle DC; Kalantar DH; Lanier TE; LaFortune KN; Lawson JK; Lowe-Webb RR; Morrissey FX; Nguyen H; Orth CD; Pelz LJ; Prantil MA; Rushford MC; Sacks RA; Salmon JT; Seppala LG; Shaw MJ; Sigurdsson RJ; Wegner PJ; Widmayer CC; Yang ST; Zobrist TL
Source
Publisher: Optica Publishing Group Country of Publication: United States NLM ID: 0247660 Publication Model: Print Cited Medium: Internet ISSN: 1539-4522 (Electronic) Linking ISSN: 1559128X NLM ISO Abbreviation: Appl Opt Subsets: PubMed not MEDLINE; MEDLINE
Subject
Language
English
Abstract
The advanced radiographic capability (ARC) laser system, part of the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory, is a short-pulse laser capability integrated into the NIF. The ARC is designed to provide adjustable pulse lengths of ∼1-38 p s in four independent beamlets, each with energies up to 1 kJ (depending on pulse duration). A detailed model of the ARC lasers has been developed that predicts the time- and space-resolved focal spots on target for each shot. Measurements made to characterize static and dynamic wavefront characteristics of the ARC are important inputs to the code. Modeling has been validated with measurements of the time-integrated focal spot at the target chamber center (TCC) at low power, and the space-integrated pulse duration at high power, using currently available diagnostics. These simulations indicate that each of the four ARC beamlets achieves a peak intensity on target of up to a few 10 18 W / c m 2 .