Hot surface ionic line emission and cold K-inner shell emission from petawatt-laser-irradiated Cu foil targets

Theobald, W.; Akli, K. U.; Clarke, R. J.; Delettrez, J. A.; Freeman, R. R.; Glenzer, S. H.; Green, J.; Gregori, G.; Heathcote, R.; Izumi, N.; King, J. A.; Koch, J. A.; Kuba, J.; Lancaster, Kate; Mackinnon, A. J.; Key, M. H.; Mileham, C.; Myatt, J. F.; Neely, D.; Norreys, P. A.; Park, H.-S.; Pasley, J.; Patel, P. K.; Regan, S. P.; Sawada, Hiroshi; Shepherd, R.; Snavely, R.; Stephens, R. B.; Stoeckl, C.; Storm, M.; Zhang, B.; Sangster, T. C.

doi:10.1063/1.2188912

Cited by 105 publications

(61 citation statements)

References 53 publications

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“…While the emission from ionized states (He α ) is dominant using the laser at fundamental wavelength, it shifts to K α radiation for frequency doubled light (see Figure 3) resulting in a narrower spectrum. This is even more surprising, as the laser intensity was higher, which should heat the sample and favorites emission from ionized states [6] . Thus frequency doubling reduces target heating.…”

Section: Resultsmentioning

confidence: 99%

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Short-pulse laser-driven x-ray radiography

Brambrink

Baton

Kœnig

et al. 2016

High Pow Laser Sci Eng

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We have developed a new radiography setup with a short-pulse laser-driven x-ray source. Using a radiography axis perpendicular to both long-and short-pulse lasers allowed optimizing the incident angle of the short-pulse laser on the x-ray source target. The setup has been tested with various x-ray source target materials and different laser wavelengths. Signal to noise ratios are presented as well as achieved spatial resolutions. The high quality of our technique is illustrated on a plasma flow radiograph obtained during a laboratory astrophysics experiment on POLARs.

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Section: Resultsmentioning

confidence: 99%

“…These electrons and the compensating return current will heat the material, which can ionize it. This can result in radiation from highly ionized states (He α ) [6] , but this effect is limited to photon energies of a few keV. The x-ray pulse duration is in the order of the laser pulse duration, thus a few ps in our case.…”

Section: Introductionmentioning

confidence: 99%

Short-pulse laser-driven x-ray radiography

Brambrink

Baton

Kœnig

et al. 2016

High Pow Laser Sci Eng

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“…Higher pulse energy should correspond to larger Kα yield but indeed the collected signal was smaller: more electrons imply a stronger heating of tracer atoms and therefore their emission was shifted outside the crystal spectral range [28]. As a result, this has also driven attention to the use of Kα spectroscopy, i.e., assessment of the temperature reached in the background target by looking at the Kα line shape and Kα wavelength shift as a results of thermally-induced heating [11][12][13]. Of course, this has attracted interest also to the use of Kβ emission as a complementary diagnostic [14].…”

Section: Importance Of Cu Tracer As a Test Casementioning

confidence: 99%

“…A more sophisticated variant of Kα diagnostics is Kα spectroscopy [11][12][13]. This is based on the fact that, when material is heated by the passage of fast electrons, atoms are ionized and subsequent Kα radiation has a shifted wavelength depending on the ionization state of the emitting ions.…”

Section: Introductionmentioning

confidence: 99%

Effects of target heating on experiments usingKαandKβdiagnostics

et al. 2015

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We describe the impact of heating and ionization on emission from the target of Kα and Kβ radiation induced by the propagation of hot electrons generated by laser-matter interaction. We consider copper as a test case and, starting from basic principles, we calculate the changes in emission wavelength, ionization cross section, and fluorescence yield as Cu is progressively ionized. We have finally considered the more realistic case when hot electrons have a distribution of energies with average energies of 50 and 500 keV (representative respectively of "shock ignition" and of "fast ignition" experiments) and in which the ions are distributed according to ionization equilibrium. In addition, by confronting our theoretical calculations with existing data, we demonstrate that this study offers a generic theoretical background for temperature diagnostics in laser-plasma interactions.

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“…These temperatures are consistent with previous observations of hot layers in short-pulse high-intensity laser plasma interaction with copper planar foils. 25 The temperature error is estimated from Fig. 7͑b͒ to be ±300 eV.…”

Section: Hot Layer Temperaturementioning

confidence: 99%

Creation of hot dense matter in short-pulse laser-plasma interaction with tamped titanium foils

et al. 2007

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Dense titanium plasma has been heated to an electron temperature up to 1300 eV with a 100 TW, high intensity short-pulse laser. The experiments were conducted using Ti foils ͑5 m thick͒ sandwiched between layers of either aluminum ͑1or2 m thick͒ or plastic ͑2 m thick͒ to prevent the effects of prepulse. Targets of two different sizes, i.e., 250ϫ 250 m 2 and 1 ϫ 1m m 2 were used. Spectral measurements of the Ti inner-shell emission, in the region between 4 and 5 keV, were taken from the front-side ͑i.e., the laser illuminated side͒ of the target. The data show large shifts in the K␣ emission from open-shell ions, suggesting bulk heating of the sample at near solid density, which was largest for reduced mass targets. Comparison with collisional radiative and 2D radiation hydrodynamics codes indicates a peak temperature of T e,peak = 1300 eV of solid titanium plasma in ϳ0.2 m thin layer. Higher bulk temperature ͑T e,bulk = 100 eV͒ for aluminum tamped compared to CH tamped targets ͑T e,bulk =40 eV͒ was observed. A possible explanation for this difference is described whereby scattering due to the nuclear charge of the tamping material leads to modified electron transport behavior.

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Hot surface ionic line emission and cold K-inner shell emission from petawatt-laser-irradiated Cu foil targets

Cited by 105 publications

References 53 publications

Short-pulse laser-driven x-ray radiography

Short-pulse laser-driven x-ray radiography

Effects of target heating on experiments usingKαandKβdiagnostics

Creation of hot dense matter in short-pulse laser-plasma interaction with tamped titanium foils

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