Measurements of Rayleigh–Taylor instability growth of laser-shocked iron–silicon alloy

Tatsuhiro Sakaiya; Hidenori Terasaki; Kosaku Akimoto; Hiroki Kato; Taichi Ueda; Ryota Hosogi; Takashi Fujikawa; Tadashi Kondo; Yoichiro Hironaka; Keisuke Shigemori

doi:10.1080/08957959.2019.1575966

Measurements of Rayleigh–Taylor instability growth of laser-shocked iron–silicon alloy

Tatsuhiro Sakaiya, Hidenori Terasaki, Kosaku Akimoto, Hiroki Kato, Taichi Ueda, Ryota Hosogi, Takashi Fujikawa, Tadashi Kondo, Yoichiro Hironaka, Keisuke Shigemori

Research output: Contribution to journal › Article › peer-review

Abstract

The Rayleigh–Taylor (RT) instability of liquid iron alloys is important for understanding the core formation mechanism in the Earth. Here we first report the measurement of RT instability growth for a liquid iron–silicon (Fe–Si) alloy, which is one of the major candidate for the material of the Earth’s core, using a high power laser. We optimized the measurement setup and analytical technique to observe the growth of perturbation on an Fe–Si sample surface. The growth of perturbation amplitude on the Fe–Si alloy under high pressure and temperature was successfully observed using in situ X-ray radiography. The growth rate of the RT instability for the Fe–Si alloy on about 1000 GPa was estimated to be 0.3 ns ⁻¹ .

Original language	English
Pages (from-to)	150-159
Number of pages	10
Journal	High Pressure Research
Volume	39
Issue number	1
DOIs	https://doi.org/10.1080/08957959.2019.1575966
Publication status	Published - Jan 2 2019
Externally published	Yes

Keywords

Earth’s core
Iron alloy
laser
Rayleigh–Taylor instability
X-ray radiography

ASJC Scopus subject areas

Condensed Matter Physics

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Measurements of Rayleigh–Taylor instability growth of laser-shocked iron–silicon alloy. / Sakaiya, Tatsuhiro; Terasaki, Hidenori; Akimoto, Kosaku; Kato, Hiroki; Ueda, Taichi; Hosogi, Ryota; Fujikawa, Takashi; Kondo, Tadashi; Hironaka, Yoichiro; Shigemori, Keisuke.

In: High Pressure Research, Vol. 39, No. 1, 02.01.2019, p. 150-159.

Research output: Contribution to journal › Article › peer-review

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abstract = " The Rayleigh–Taylor (RT) instability of liquid iron alloys is important for understanding the core formation mechanism in the Earth. Here we first report the measurement of RT instability growth for a liquid iron–silicon (Fe–Si) alloy, which is one of the major candidate for the material of the Earth{\textquoteright}s core, using a high power laser. We optimized the measurement setup and analytical technique to observe the growth of perturbation on an Fe–Si sample surface. The growth of perturbation amplitude on the Fe–Si alloy under high pressure and temperature was successfully observed using in situ X-ray radiography. The growth rate of the RT instability for the Fe–Si alloy on about 1000 GPa was estimated to be 0.3 ns −1 . ",

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author = "Tatsuhiro Sakaiya and Hidenori Terasaki and Kosaku Akimoto and Hiroki Kato and Taichi Ueda and Ryota Hosogi and Takashi Fujikawa and Tadashi Kondo and Yoichiro Hironaka and Keisuke Shigemori",

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AU - Sakaiya, Tatsuhiro

AU - Terasaki, Hidenori

AU - Akimoto, Kosaku

AU - Kato, Hiroki

AU - Ueda, Taichi

AU - Hosogi, Ryota

AU - Fujikawa, Takashi

AU - Kondo, Tadashi

AU - Hironaka, Yoichiro

AU - Shigemori, Keisuke

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N2 - The Rayleigh–Taylor (RT) instability of liquid iron alloys is important for understanding the core formation mechanism in the Earth. Here we first report the measurement of RT instability growth for a liquid iron–silicon (Fe–Si) alloy, which is one of the major candidate for the material of the Earth’s core, using a high power laser. We optimized the measurement setup and analytical technique to observe the growth of perturbation on an Fe–Si sample surface. The growth of perturbation amplitude on the Fe–Si alloy under high pressure and temperature was successfully observed using in situ X-ray radiography. The growth rate of the RT instability for the Fe–Si alloy on about 1000 GPa was estimated to be 0.3 ns −1 .

AB - The Rayleigh–Taylor (RT) instability of liquid iron alloys is important for understanding the core formation mechanism in the Earth. Here we first report the measurement of RT instability growth for a liquid iron–silicon (Fe–Si) alloy, which is one of the major candidate for the material of the Earth’s core, using a high power laser. We optimized the measurement setup and analytical technique to observe the growth of perturbation on an Fe–Si sample surface. The growth of perturbation amplitude on the Fe–Si alloy under high pressure and temperature was successfully observed using in situ X-ray radiography. The growth rate of the RT instability for the Fe–Si alloy on about 1000 GPa was estimated to be 0.3 ns −1 .

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KW - Rayleigh–Taylor instability

KW - X-ray radiography

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