Progress in direct-drive fusion studies for the Laser Mégajoule

Autor:	C. Meyer, X. Fortin, B. Canaud, F. Garaude, F. Philippe
Rok vydání:	2004
Předmět:	Physics Fusion Thermonuclear fusion business.industry Context (language use) Condensed Matter Physics Laser Atomic and Molecular Physics and Optics law.invention Ignition system Optics law Irradiation Electrical and Electronic Engineering business Beam (structure) Laser Mégajoule
Zdroj:	Laser and Particle Beams. 22:109-114
ISSN:	1469-803X 0263-0346
DOI:	10.1017/s0263034604222042
Popis:	In the context of the French Laser Mégajoule (LMJ) fusion research program, direct drive is an alternate to indirect drive to reach ignition and thermonuclear burn. We present recent progress in the direct-drive fusion studies for LMJ. Calculations have shown that the LMJ irradiation uniformity is characterized by long wavelength asymmetries compatible with direct drive requirements. Calculations of the irradiation uniformity in the context of indirect drive beam positioning have been done. We show that non-uniformity can be minimized by repointing the beams. Unfortunately, a time analysis shows that this nonuniformity increases strongly in time above levels usually considered inconsistent for direct drive. Finally, a recent baseline target design is presented and consists of a DT ice shell surrounded by a low-density CH foam wicked with cryogenic DT. This design can potentially reach a gain of 90 with a 1-MJ on-target laser driver. Hydrodynamic stability is increased at the ablation front and the laser–target coupling efficiency achieves 85%.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6579a7a2e59fe8d7c69f584433fe9312 https://doi.org/10.1017/s0263034604222042 Zobrazit plný text záznamu