Laboratory measurement of opacity for stellar envelopes

Springer, P. T.; Wong, K. L.; Iglesias, Carlos A.; Hammer, J. H.; Porter, J. L.; Toor, A.; Goldstein, W. H.; Wilson, B. G.; Rogers, F. J.; Deeney, C.; Dearborn, David S. P.; Brüns, C.; Emig, J.; Stewart, Richard E.

doi:10.1016/s0022-4073(97)00099-x

Cited by 98 publications

(32 citation statements)

References 14 publications

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“…This experiment, which is discussed further in Sec. III, measured the opacity of iron under conditions relevant to stellar envelopes, and was directly relevant to reducing uncertainties in the models of pulsating stars, the so-called Cepheid variables ͑Rogers and Springer et al, 1997͒. The Z pinch at the Saturn pulsed power facility at SNLA drove concentric primary and secondary cylindrical hohlraums. An iron sample placed in the secondary hohlraum was heated to equilibrium temperatures of ϳ20 eV at a density of ϳ10 −4 g/cm 3 .…”

Section: Astrophysics Experimentsmentioning

confidence: 99%

“…The Z pinch implodes on the axis of a primary hohlraum which is used as a source of a thermal x-ray radiation for probing an iron plasma and measuring its opacity under conditions relevant to the physics of Cepheid variable stars. Adapted from Springer et al, 1997. ͑b͒ Measurement of the Fe sample transmission spectrum from the experiment sketched in ͑a͒.…”

Section: Fig 2 Examples Of Laboratory Astrophysics Experiments Donementioning

confidence: 99%

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Experimental astrophysics with high power lasers andZpinches

2006

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With the advent of high-energy-density ͑HED͒ experimental facilities, such as high-energy lasers and fast Z-pinch, pulsed-power facilities, millimeter-scale quantities of matter can be placed in extreme states of density, temperature, and/or velocity. This has enabled the emergence of a new class of experimental science, HED laboratory astrophysics, wherein the properties of matter and the processes that occur under extreme astrophysical conditions can be examined in the laboratory. Areas particularly suitable to this class of experimental astrophysics include the study of opacities relevant to stellar interiors, equations of state relevant to planetary interiors, strong shock-driven nonlinear hydrodynamics and radiative dynamics relevant to supernova explosions and subsequent evolution, protostellar jets and high Mach number flows, radiatively driven molecular clouds and nonlinear photoevaporation front dynamics, and photoionized plasmas relevant to accretion disks around compact objects such as black holes and neutron stars.

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Section: Astrophysics Experimentsmentioning

confidence: 99%

Section: Fig 2 Examples Of Laboratory Astrophysics Experiments Donementioning

confidence: 99%

Experimental astrophysics with high power lasers andZpinches

2006

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“…In particular, by using intense radiation to cause ablation from one side of a sample under study, one can excite a strong shock wave in the sample and obtain information about the equation of state (Branitski et al, 1996;Olson et al, 1997). Extreme states of matter achievable in fast Z pinches can be used to obtain information about opacities for astrophysics (Springer et al, 1997); they are also of interest for pulsed V W or x-ray lasers (Spielman et al, 1985a;Dangor, 1986;Porter et al, 1992a). One more application is based on the compression of the initial bias magnetic field by a conducting shell.…”

Section: F Applicationsmentioning

confidence: 99%

“…Very encouraging results have been achieved in the studies of the opacities of the iron plasma (Springer, 1997). Interesting possibilities exist for simulating various high-energydensity astrophysical phenomena -for example, the formation of high-energy intergalactic jets.…”

Section: Ivd4)mentioning

confidence: 99%

The physics of fast Z pinches

Ryutov¹,

Derzon²,

Matzen³

1998

101

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“…Soft X-ray (SXR) sources in the wavelength range above 20 Å attract considerable recent interest due to their possible scientific and technological applications including nanolithography, investigations of the inner structure of biological objects, astrophysical studies, etc. [4][5][6][7]. At present, as sources of such pulsed radiation, laser plasmas are mainly used.…”

mentioning

confidence: 99%

Emission of a low-power laser-induced vacuum discharge plasma in the EUV and SXR spectral ranges

Rupasov

Romanov

Kologrivov

et al. 2018

EPJ Web of Conferences

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Abstract. X-ray spectral characteristics of a vacuum discharge plasma with the storage energy lower than 30 J initiated on an Al or a Fe cathode by a 10 12 W/cm 2 neodymium laser were studied in the 30 -300 Å wavelength range. It is shown that both the spectral composition and intensity of radiation of a micropinch plasma produced in the cathode jet of the discharge are determined by parameters of the discharge and laser pulse. These parameters were optimized to achieve a regime in which a considerable part of radiation energy was concentrated in the long-wavelength band of the quasi-continuum (230 -270 Å and 160 -200 Å for Al and Fe, respectively), which makes this discharge a source of narrowband X-ray radiation.It is known that local regions of a hot micron-scale plasma produced in a high-current vacuum discharge plasma due pinching (micropinches) are sources of intense electromagnetic radiation in a broad spectral range. The emission spectra of micropinches in the hard X-ray range at wavelengths λ < 2 Å were studied in many works (see, for example, [1-3]). Soft X-ray (SXR) sources in the wavelength range above 20 Å attract considerable recent interest due to their possible scientific and technological applications including nanolithography, investigations of the inner structure of biological objects, astrophysical studies, etc. [4][5][6][7]. At present, as sources of such pulsed radiation, laser plasmas are mainly used. An important parameter for applications of radiation sources is the SXR conversion efficiency from a storage electric energy. From this point of view, it is interesting to use micropinch radiation sources. It was shown earlier that in vacuum discharge plasma with the storage energy about 10 J initiated on a cathode by a low-power laser pulse, micropinches emitting SXRs in the wavelength region > 40 Å are formed. The plasma pinching process stability and micropinch parameters were controlled by the laser pulse parameters [8,9]. These results suggest the possibility of making a local source of intense SXR with a comparatively low energy deposition based on the laserinduced vacuum discharge.

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Laboratory measurement of opacity for stellar envelopes

Cited by 98 publications

References 14 publications

Experimental astrophysics with high power lasers andZpinches

Experimental astrophysics with high power lasers andZpinches

The physics of fast Z pinches

Emission of a low-power laser-induced vacuum discharge plasma in the EUV and SXR spectral ranges

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