Observation of low-mode implosion nonuniformity of plastic-shell targets in the acceleration phase

Manabu Heya; Hiroyuki Shiraga; Masaharu Nishikino; Shinsuke Fujioka; Kazuhisa Fujita; Yoshihiro Ochi; Nobuhiko Izumi; Noriaki Miyanaga; Hiroaki Nishimura; Hiroshi Azechi; Hideaki Takabe; Kunioki Mima; Tatsuhiko Yamanaka

doi:10.1117/12.375139

11 January 2000 Observation of low-mode implosion nonuniformity of plastic-shell targets in the acceleration phase

Manabu Heya, Hiroyuki Shiraga, Masaharu Nishikino, Shinsuke Fujioka, Kazuhisa Fujita, Yoshihiro Ochi, Nobuhiko Izumi, Noriaki Miyanaga, Hiroaki Nishimura, Hiroshi Azechi, Hideaki Takabe, Kunioki Mima, Tatsuhiko Yamanaka

Author Affiliations +

Proceedings Volume 3886, High-Power Lasers in Energy Engineering; (2000) https://doi.org/10.1117/12.375139
Event: Advanced High-Power Lasers and Applications, 1999, Osaka, Japan

Abstract

IN order to directly observe low-mode implosion nonuniformities, especially of l equals 1, which prevents stable formation of a hot spark in the compressed core plasma at the final stage of the implosion, a series of direct-drive implosion experiments has been performed at the Gekko-XII glass laser facility by using gas-filled plastic- shell targets. Partially coherent light (PCL) was used as a drive laser to suppress middle- to higher-modes of the irradiation nonuniformity down to approximately 1 percent. A clear shift from the center of the chamber and a slight crosswise structure were seen in the time- and space- resolved shape of the shell in the accelerating phase with an x-ray framing camera and absorbed laser intensity were also estimated by using a rocket equation. In order to confirm the property of these results, separate experiments under similar laser conditions were performed by using Au- coated sapphire spheres as surrogate target. The x-ray intensity distribution on the circumference of the target in the XFCs image, which is strongly dependent on the drive nonuniformity in the accelerating shell resulted from the l equals 1 drive nonuniformity. In our experiments, the l equals 1 drive nonuniformity due to some reproducible factors was found to be of the order of approximately 10-20 percent.

Citation Download Citation

Manabu Heya, Hiroyuki Shiraga, Masaharu Nishikino, Shinsuke Fujioka, Kazuhisa Fujita, Yoshihiro Ochi, Nobuhiko Izumi, Noriaki Miyanaga, Hiroaki Nishimura, Hiroshi Azechi, Hideaki Takabe, Kunioki Mima, and Tatsuhiko Yamanaka "Observation of low-mode implosion nonuniformity of plastic-shell targets in the acceleration phase", Proc. SPIE 3886, High-Power Lasers in Energy Engineering, (11 January 2000); https://doi.org/10.1117/12.375139

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
8 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

X-rays

Laser ablation

Plasma

Optical spheres

Sapphire

X-ray imaging

Glasses

Show All Keywords

Keywords/Phrases

Search In:

Publication Years