Study of Z-pinch dynamic hohlraum shadowgraphy

Chen Fa-Xin; Feng Jing-Hua; Li Lin-Bo; Yang Jian-Lun; Zhou Lin; Xu Rong-Kun; Xu Ze-Ping

doi:10.7498/aps.62.045204

Abstract

In order to obtain the dynamic evolution image of tungsten array for foam padding, and to research the form of interaction between tungsten plasma and foam column, a shadow imaging system of four-frame ultraviolet probe laser (266 nm) is designed on 1 MA pulse power device. The time resolution of the system is 2.5 ns, and static space resolution is superior to 70 μm. The radial shadowgraphy image reveals the whole process from the melting and expansion of solid wire to the interaction between the precursor plasma and the foam, from the pinch to rebound inflation. The image shows the continuous interaction between tungsten plasma and foam in the form of Raining within a time of about 50 ns, the plasma shell structure is not found in the whole period of pinch. The quantitative analysis indicates that the minimum pinching speed of the foam column is 1.0×106 cm/s, and maximum pinching speed is 6.0×106 cm/s, and the axial stagnation diameter is about 1 mm. Shadowgram mainly shows the inverse bremsstrunlung effect of interaction between laser and plasma through simulation calculating, and main tungsten plasma interacting with foam column image is shown through synchronizing radial power profile.

Keywords:

Authors and contacts

1.
Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11005095).

References

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Cited By

[1]	Apruzese J P, Clark R W, Kepple P C, Davis J 2005 Phys. Plasmas 12 012705
[2]	Sanford T W L, Lemke R W, Mock R C, Chandler G A 2004 Phys. Plasmas 9 3573
[3]	Sanford T W L, Nash T J, Mock R C 2005 Phys. Plasmas 12 022701
[4]	Sanford T W L, Nash T J, Mock R C 2006 Phys. Plasmas 13 012701
[5]	Hutchinson I H 2002 Principle of Plasma Diagnostics (Cambridge: Cambridge University Press) p129
[6]	Chang T Q 1991 Laser Plasma Interaction and Laser Fusion (Changsha: Hunan Science and Technology) p23 (in Chinese) [常铁强 1991 激光等离子体相互作用与激光聚变 (长沙: 湖南科学技术出版社) 第23页]

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Catalog

Vol. 62, Issue 4 - 2013-02-20

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