LASER-driven fast electron dynamics in gaseous media under the influence of large electric fields

Batani, D.; Baton, S. D.; Manclossi, M.; Piazza, Daniele; Kœnig, M.; Benuzzi‐Mounaix, A.; Popescu, Horia; Rousseaux, C.; Borghesi, M.; Cecchetti, C. A.; Schiavi, A.

doi:10.1063/1.3080746

Cited by 14 publications

(5 citation statements)

References 33 publications

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“…4 is based on the usual approach to proton imaging in which the proton energy loss during the target penetration is neglected assuming a direct correspondence between time-of-flight and stopping range of proton inside the detector. This approach has proven to be very successful in the detection of electric and magnetic fields in plasmas, 14,15 but, as we will show in the following, it falls if applied to a the typical ICF. Starting from this point of view, in Ref.…”

Section: Many Diagnosticsmentioning

confidence: 99%

Proton radiography of laser-driven imploding target in cylindrical geometry

et al. 2011

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An experiment was done at the Rutherford Appleton Laboratory ͑Vulcan laser petawatt laser͒ to study fast electron propagation in cylindrically compressed targets, a subject of interest for fast ignition. This was performed in the framework of the experimental road map of HiPER ͑the European high power laser energy research facility project͒. In the experiment, protons accelerated by a picosecond-laser pulse were used to radiograph a 220 m diameter cylinder ͑20 m wall, filled with low density foam͒, imploded with ϳ200 J of green laser light in four symmetrically incident beams of pulse length 1 ns. Point projection proton backlighting was used to get the compression history and the stagnation time. Results are also compared to those from hard x-ray radiography. Detailed comparison with two-dimensional numerical hydrosimulations has been done using a Monte Carlo code adapted to describe multiple scattering and plasma effects. Finally we develop a simple analytical model to estimate the performance of proton radiography for given implosion conditions.

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Section: Many Diagnosticsmentioning

confidence: 99%

Proton radiography of laser-driven imploding target in cylindrical geometry

et al. 2011

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“…Also, in such a situation both the background electrons are accelerated to velocities similar to the fast electrons and a number of fast electrons are 'rejected' back effectively contributing to the return current. In such conditions very strong electric fields associated to fast electron propagation inside the gas medium have been evidenced by using proton radiography [53].…”

Section: Fast Electron Beam Energy Transport In Solid Matter and Mech...mentioning

confidence: 99%

Fast electron energy transport in solid density and compressed plasma

et al. 2014

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We provide a review of selected experiments on fast electron transport in solids and plasmas following laser-matter interaction at relativistic intensities. Particular attention is given to precise measurements of intense laser pulses, fast electron energy transfer and the mean kinetic energy of the fast electrons. We discuss in detail mechanism of fast electron energy loss in solid and warm dense targets. We show that stopping due to resistive electric field and collimation due to resistive magnetic field play significant roles in fast electron dynamics. It has also been shown that reducing the size of the target can significantly affect the Kα production from the targets. The use of reduced-mass target can also increase temperature up to 1 keV level, which provides an excellent platform for fast electron transport without assembling the fuel. The pre-pulse is a significant issue in fast ignition for fast electron coupling to the compressed core. Indeed, we have shown using a variety of targets that the laser pre-pulse can significantly reduce transfer of energy farther into the target. In this article, we show that a significant progress has been made in understanding the critical issues of fast electron transport pertinent to fast ignition (FI). This understanding will facilitate a better target design for large scale FI integrated experiments when laser facilities become available.

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“…After a detailed characterization of particle emission from PETAL targets, the diagnostics will be used for plasma experiments. As an example, we mention the proton radiography to determine the magnetic [14] or electric field [1] structure at the plasma scale or to measure the density of the LMJ plasmas [22,26]. Stacks of radiochromic films and/or IPs will be used for the X-ray or proton radiography of targets irradiated with LMJ beams.…”

Section: No /mentioning

confidence: 99%

Development of the PETAL Laser Facility and its Diagnostic Tools

Batani¹,

Hulin²,

Ducret³

et al. 2013

Acta Polytech

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The PETAL system (PETawatt Aquitaine Laser) is a high-energy short-pulse laser, currently in an advanced construction phase, to be combined with the French Mega-Joule Laser (LMJ). In a first operational phase (beginning in 2015 and 2016) PETAL will provide 1 kJ in 1 ps and will be coupled to the first four LMJ quads. The ultimate performance goal to reach 7PW (3.5 kJ with 0.5 ps pulses). Once in operation, LMJ and PETAL will form a unique facility in Europe for High Energy Density Physics (HEDP). PETAL is aiming at providing secondary sources of particles and radiation to diagnose the HED plasmas generated by the LMJ beams. It also will be used to create HED states by short-pulse heating of matter. Petal+ is an auxiliary project addressed to design and build diagnostics for experiments with PETAL. Within this project, three types of diagnostics are planned: a proton spectrometer, an electronspectrometer and a large-range X-ray spectrometer.

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LASER-driven fast electron dynamics in gaseous media under the influence of large electric fields

Cited by 14 publications

References 33 publications

Proton radiography of laser-driven imploding target in cylindrical geometry

Proton radiography of laser-driven imploding target in cylindrical geometry

Fast electron energy transport in solid density and compressed plasma

Development of the PETAL Laser Facility and its Diagnostic Tools

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