Experimental investigation of radiation heat waves driven by laser-induced Planck radiation

Sigel, R.; Tsakiris, George D.; Lavarenne, F.; Massen, J.; Fedosejevs, R.; Eidmann, K.; Meyer‐ter‐Vehn, Jürgen; Murakami, M.; Witkowski, S.; Nishimura, Hiroaki; Kato, Yusuke; Takabe, H.; Endo, Tamio; Kondo, Kiminori; Shiraga, H.; Shimizu, Shuji; Jitsuno, Takahisa; Takagi, Masaru; Nakai, S.; Yamanaka, Chiyoe

doi:10.1103/physreva.45.3987

Cited by 29 publications

(9 citation statements)

References 17 publications

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“…The resulting velocity and depth of penetration of the radiatively driven ionization wave is 1 to 2 orders of magnitude greater than that observed at low intensity. Previous measurements of radiative transport effects have been largely composed of long pulse ͑ϳ1 ns͒ studies where the effects of radiative transport have been inferred by indirect means [7] or by direct measurement of radiative transport effects in thin foils [8,9] or foams [10] driven by a separate lasercreated x-ray source. In these experiments the drive laser pulse width was comparable to or longer than the time scale for the energy transport.…”

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confidence: 99%

Supersonic Ionization Wave Driven by Radiation Transport in a Short-Pulse Laser-Produced Plasma

et al. 1996

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Through the use of an ultrashort (2 ps) optical probe, we have time resolved the propagation of an ionization wave into solid fused silica. This ionization wave results when a plasma is created by the intense irradiation of a solid target with a 2 ps laser pulse. We find that the velocity of the ionization wave is consistent with radiation driven thermal transport, exceeding the velocity expected from simple electron thermal conduction by nearly an order of magnitude. [S0031-9007(96)00542-X] PACS numbers: 52.50.Jm, 52.25.Fi, 52.40.Nk, 52.70.Kz Progress in understanding the interaction of intense, ultrashort laser pulses with plasmas has been quite dramatic in the previous decade [1]. This progress has been fueled by a desire to study plasma conditions at very high temperatures and electron densities, a condition made possible by the development of intense picosecond lasers which can rapidly heat a plasma before significant hydrodynamic expansion can take place [2]. Understanding of the physics behind energy transport mechanisms in these plasmas is central to these studies. This is not only because of the fundamental nature of these mechanisms to the understanding of plasma physics in general, but also because a clear picture of energy transport is required to fully understand the dynamics of ultrashort pulse x-ray generation [3], a very important application of short-pulse produced plasmas [4].One important ultrafast process driven by energy transport is the formation of an ionization wave that propagates with a supersonic velocity into the solid after the target surface has been heated by an intense short pulse [5]. This process has been studied previously at intensities of ,5 3 10 14 W͞cm 2 where the plasmas formed exhibited temperatures of 50 eV or less [6]. In these studies the velocity of the ionization wave was inferred from the Doppler shift exhibited by a probe beam reflected off the expanding ionization front within the cold fused silica substrate. This experiment found that the velocity of the ionization wave could be well explained by standard electron thermal conduction in this low intensity regime.In this Letter we report the first time resolved measurements of the spatial extent of an ionization wave produced with high intensity (up to 10 17 W͞cm 2 ) picosecond pulses. At this intensity we find that the velocity of the ionization wave cannot be explained by simple electron thermal conduction. We find that our measurements are, instead, consistent with radiative thermal conduction. The resulting velocity and depth of penetration of the radiatively driven ionization wave is 1 to 2 orders of magnitude greater than that observed at low intensity. Previous measurements of radiative transport effects have been largely composed of long pulse ͑ϳ1 ns͒ studies where the effects of radiative transport have been inferred by indirect means [7] or by direct measurement of radiative transport effects in thin foils [8,9] or foams [10] driven by a separate lasercreated x-ray source. In these experiments the drive...

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confidence: 99%

Supersonic Ionization Wave Driven by Radiation Transport in a Short-Pulse Laser-Produced Plasma

et al. 1996

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“…The thick solid line represents a trajectory for a 1 ns square laser pulse drive, which is the "" standard ÏÏ implosion discussed in this paper. The X-ray Ñux created by this laser drive has been well characterized for inertial conÐnement fusion by X-ray diode and "" witness plate ÏÏ measurements which accurately measure temporal and spectral information of the Ñux (Kau †man et al 1994 ;Sigel et al 1990aSigel et al , 1990bSigel et al , 1992. The thin solid line is a curve for a shaped 1.7 ns laser drive often used in high convergence experiments similar to those described by Landen et al (1994).…”

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confidence: 93%

Implosions: An Experimental Testbed for High‐Energy Density Physics

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Woolsey

Mißalla

et al. 2000

ASTROPHYS J SUPPL S

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The Nova laser facility has been used to produce matter in extreme conditions in the laboratory. The plasmas are produced by imploding spherical capsules Ðlled with deuterium and trace amounts of Ar. A spectroscopic study of these indirectly driven, inertially conÐned plasmas provides measurements of the plasma parameters as a function of time. Multiple diagnostics measure peak cm~3 and n e D 1 ] 1024 eV. A series of experiments have demonstrated that the results are reliable and reproducible. T e D 1000 These experiments are designed to produce laboratory implosions that can serve as a "" testbed ÏÏ for high energy density matter. Measuring temperature gradients are the next step so that they can become sources suitable for studying physics such as high-density plasma e †ects or radiative cooling.

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“…There are various diffraction elements for dispersing soft X-rays, for example, crystal (Koenig et al, 1997;Arora et al, 2000), grazing grating (Chowdhury et al, 1999), or transmission grating (Fiedorowicz et al, 1996). In contrast, transmission grating spectrographs (TGS) operating at normal incidence are convenient to use and can be coupled to detectors such as microchannel plates (MCPs) and charge-coupled-device (CCD) cameras for online monitoring (Fiedorowicz et al, 1996;Alexandrov et al, 1988;Zeng et al, 1992) and streak cameras for temporally resolved measurements (Fiedorowicz et al, 1996;Bourgade et al, 1988;Sigel et al, 1992). In contrast, transmission grating spectrographs (TGS) operating at normal incidence are convenient to use and can be coupled to detectors such as microchannel plates (MCPs) and charge-coupled-device (CCD) cameras for online monitoring (Fiedorowicz et al, 1996;Alexandrov et al, 1988;Zeng et al, 1992) and streak cameras for temporally resolved measurements (Fiedorowicz et al, 1996;Bourgade et al, 1988;Sigel et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

“…Although crystal spectrographs based on Bragg reflection and flat field grating spectrographs based on Rowland circle geometry can be used to achieve high spectral resolution, these are quite cumbersome in operation and require critical alignment. As a matter of fact, TGS have been widely used in laser-plasma studies requiring a wide spectral range (0.5 nm-20 nm), and a moderate resolution (Fiedorowicz et al, 1996;Alexandrov et al, 1988;Eidmann et al, 1986;Bourgade et al, 1988;Zeng et al, 1992;Sigel et al, 1992). As a matter of fact, TGS have been widely used in laser-plasma studies requiring a wide spectral range (0.5 nm-20 nm), and a moderate resolution (Fiedorowicz et al, 1996;Alexandrov et al, 1988;Eidmann et al, 1986;Bourgade et al, 1988;Zeng et al, 1992;Sigel et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

Diagnosis of the soft X-ray spectrum emitted by laser-plasmas using a spectroscopic photon sieve

et al. 2012

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Laser plasma experiments, which demonstrated the single order diffraction property of spectroscopic photon sieve (a novel single-order diffraction grating), were performed on the SILEX-I femto-second laser facility. High-intensity laser radiation was focused onto a Cu target to generate plasma. The spectra of soft X-ray from copper plasmas have been measured with spectroscopic photon sieve based spectrograph. The results show that the spectroscopic photon sieve is able to provide soft X-ray spectrum free from higher-order diffraction components. The measured spectra obtained with such a spectroscopic photon sieve need no unfolding process to extract higher-order diffraction interference.

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Experimental investigation of radiation heat waves driven by laser-induced Planck radiation

Cited by 29 publications

References 17 publications

Supersonic Ionization Wave Driven by Radiation Transport in a Short-Pulse Laser-Produced Plasma

Supersonic Ionization Wave Driven by Radiation Transport in a Short-Pulse Laser-Produced Plasma

Implosions: An Experimental Testbed for High‐Energy Density Physics

Diagnosis of the soft X-ray spectrum emitted by laser-plasmas using a spectroscopic photon sieve

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