[Table of Contents]

Plasma and Fusion Research

Volume 10, 1404076 (2015)

Regular Articles


Measurements of Preformed Plasma Generation and Its Suppression Inside a Cone in a Cone-in-Shell Target for Fast Ignition
Shoji HATTORI, Keisuke SHIGEMORI, Yoichiro HIRONAKA, Takumi YAMAMOTO, Hiroki KATO, Shinsuke FUJIOKA, Hiroyuki SHIRAGA and Hiroshi AZECHI
Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka 565-0871, Japan
(Received 12 May 2015 / Accepted 30 July 2015 / Published 25 September 2015)

Abstract

We have investigated preformed plasma generation inside a cone on cone-in-shell targets for fast ignition scheme. We focused on the study of preformed plasma generation via irradiation by an implosion laser. In the GEKKO-XII laser system (Institute of Laser Engineering, Osaka University), a large fraction of laser energy is frequency-doubled to a 527 µm wavelength light with KDP crystals, but unconverted fundamental light (λ = 1.053 µm) is ultimately a possible heating source for the target. We measured the temperature at the inside tip of the cone in several experimental conditions to verify the effect of unconverted light. The experimental results indicated that the direct irradiation inside the cone with the unconverted fraction is the primary source of preheating effects. The results also suggest that preheating is suppressed by “long” cone targets whose sizes are typically larger than the focal points of incident unconverted light.


Keywords

fast ignition, cone-in-shell target, unconverted light, streaked optical pyrometer

DOI: 10.1585/pfr.10.1404076


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This paper may be cited as follows:

Shoji HATTORI, Keisuke SHIGEMORI, Yoichiro HIRONAKA, Takumi YAMAMOTO, Hiroki KATO, Shinsuke FUJIOKA, Hiroyuki SHIRAGA and Hiroshi AZECHI, Plasma Fusion Res. 10, 1404076 (2015).