Time-Resolved Measurements of Hot-Electron Equilibration Dynamics in High-Intensity Laser Interactions with Thin-Foil Solid Targets

Nilson, P. M.; Davies, J. R.; Theobald, W.; Jaanimagi, P. A.; Mileham, C.; Jungquist, R.; Stoeckl, C.; Begishev, I. A.; Solodov, A. A.; Myatt, J. F.; Zuegel, J. D.; Sangster, T.C.; Betti, R.; Meyerhofer, D. D.

doi:10.1103/physrevlett.108.085002

Cited by 63 publications

(71 citation statements)

References 37 publications

(16 reference statements)

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“…The study of fast electrons generated in these experiments is of interest, for instance, in shock [2] and fast [3] ignitions in inertial confinement fusion (ICF) and in energetic secondary particle production [4]. The Kα emission generated by the EII process is analyzed by either imagers which provide spatial and temporal information of relativistic electrons [5] or spectrometers which provide bulk electron temperatures [6]. In addition, copper is a material that has been often used in those experiments because it has a maximum total K-shell emission yield [1].…”

Section: Introductionmentioning

confidence: 99%

Copper fine-structure K-shell electron impact ionization cross sections for fast-electron diagnostic in laser-solid experiments

Palmeri

Quinet

Batani

2015

Atomic Data and Nuclear Data Tables

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a b s t r a c tThe K-shell electron impact ionization (EII) cross section, along with the K-shell fluorescence yield, is one of the key atomic parameters for fast-electron diagnostic in laser-solid experiments through the K-shell emission cross section. In addition, copper is a material that has been often used in those experiments because it has a maximum total K-shell emission yield. Furthermore, in a campaign dedicated to the modeling of the K lines of astrophysical interest (Palmeri et al., 2012), the K-shell fluorescence yields for the K-vacancy fine-structure atomic levels of all the copper isonuclear ions have been calculated.In this study, the K-shell EII cross sections connecting the ground and the metastable levels of the parent copper ions to the daughter ions K-vacancy levels considered in Palmeri et al. (2012) have been determined. The relativistic distorted-wave (DW) approximation implemented in the FAC atomic code has been used for the incident electron kinetic energies up to 10 times the K-shell threshold energies. Moreover, the resulting DW cross sections have been extrapolated at higher energies using the asymptotic form proposed by Davies et al. (2013).

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Section: Introductionmentioning

confidence: 99%

Copper fine-structure K-shell electron impact ionization cross sections for fast-electron diagnostic in laser-solid experiments

Palmeri

Quinet

Batani

2015

Atomic Data and Nuclear Data Tables

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“…This important effect, seen in thin targets [27], had not been realized before for mm thick targets at high intensities. Note that as the laser energy at fixed intensity decreases, positron production would move from the analytical model with η=1 to the GEANT4 calculation as less and less electrons reflux through the target.…”

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confidence: 73%

Scaling the Yield of Laser-Driven Electron-Positron Jets to Laboratory Astrophysical Applications

et al. 2015

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We report new experimental results obtained on three different laser facilities that show directed laser-driven relativistic electron-positron jets with up to 30 times larger yields than previously obtained and a quadratic (~ E L 2 ) dependence of the positron yield on the laser energy. This favorable scaling stems from a combination of higher energy electrons due to increased laser intensity and the recirculation of MeV electrons in the mm-thick target. Based on this scaling, first principles simulations predict the possibility of using such electron-positron jets, produced at upcoming high-energy laser facilities, to probe the physics of relativistic collisionless shocks in the laboratory.

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“…Another important parameter for this technique is the emission time of the backlighter, which determines the time resolution, because a time-integrating detector was used. Figure 2d shows a time-resolved measurement of the K a flash 23 by coupling an ultrafast X-ray streak camera to the Bragg crystal imager. A K a emission time of 12 ps was quantified, which is short enough to prevent any spatial blurring from the hydrodynamic motion.…”

Section: Resultsmentioning

confidence: 99%

“…The OMEGA EP laser was defocused to an B200-mm spot that provided an intensity of B5 Â 10 17 W cm À 2 and generated fast electrons with a kinetic energy in the range of several 100 keV to BMeV (ref. 23). Strong electrostatic sheath fields at the target boundary retain most of the fast electrons in the B1-mm foil.…”

Section: Resultsmentioning

confidence: 99%

Time-resolved compression of a capsule with a cone to high density for fast-ignition laser fusion

et al. 2014

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The advent of high-intensity lasers enables us to recreate and study the behaviour of matter under the extreme densities and pressures that exist in many astrophysical objects. It may also enable us to develop a power source based on laser-driven nuclear fusion. Achieving such conditions usually requires a target that is highly uniform and spherically symmetric. Here we show that it is possible to generate high densities in a so-called fast-ignition target that consists of a thin shell whose spherical symmetry is interrupted by the inclusion of a metal cone. Using picosecond-time-resolved X-ray radiography, we show that we can achieve areal densities in excess of 300 mg cm À 2 with a nanosecond-duration compression pulsethe highest areal density ever reported for a cone-in-shell target. Such densities are high enough to stop MeV electrons, which is necessary for igniting the fuel with a subsequent picosecond pulse focused into the resulting plasma.

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Time-Resolved Measurements of Hot-Electron Equilibration Dynamics in High-Intensity Laser Interactions with Thin-Foil Solid Targets

Cited by 63 publications

References 37 publications

Copper fine-structure K-shell electron impact ionization cross sections for fast-electron diagnostic in laser-solid experiments

Copper fine-structure K-shell electron impact ionization cross sections for fast-electron diagnostic in laser-solid experiments

Scaling the Yield of Laser-Driven Electron-Positron Jets to Laboratory Astrophysical Applications

Time-resolved compression of a capsule with a cone to high density for fast-ignition laser fusion

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