Interaction of a self-focused laser beam with a DT fusion target in a plasma-loaded cone-guided ICF scheme

Saedjalil, N.; Mehrangiz, Mahsa; Jafari, S.; Ghasemizad, A.

doi:10.1140/epjp/i2016-16188-1

Cited by 4 publications

(1 citation statement)

References 17 publications

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“…Kant et al [24] observed self-focusing of a Hermite Gaussian laser beam in the presence of an upward plasma density ramp which also led to stronger self-focusing. Saedajali et al [25] studied the interaction of a self-focused laser beam with a plasma-loaded cone in the context of cone-guided fast ignition. Here, we take the obvious further step of introducing an upward plasma density ramp into the cone in order to obtain stronger selffocusing.…”

Section: Introductionmentioning

confidence: 99%

Optimizing laser focal spot size using self-focusing in a cone-guided fast-ignition ICF target

et al. 2021

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This paper presents a scheme for strong self-focusing of a laser beam interacting with a cone-guided fast-ignition inertial confinement fusion target using cone pre-plasma filling as an optical medium for reducing the laser beam waist. The objective is to reduce the focal spot size at the interior of the tip of the re-entrant cone to that required for efficient coupling to the dense imploded fuel core. This is challenging to achieve in a large laser system using the standard optical components of a chirped-pulse-amplified (CPA) laser-beam chain where the spot sizes produced are often significantly larger than would be desirable for fast ignition. The approach described also makes use of the presence of pre-plasma in the cone. Such pre-plasma filling is difficult to avoid entirely when illuminating a cone with a high-energy CPA laser system due to the challenges of reducing laser pre-pulse to below the threshold for plasma production. For deriving the differential equation which governs the progress of the laser beam-width with propagation distance, paraxial theory in a WKB approximation has been used. A simulation is performed assuming strong self-focusing in accordance with the laser parameters and plasma density profile chosen.

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Section: Introductionmentioning

confidence: 99%

Optimizing laser focal spot size using self-focusing in a cone-guided fast-ignition ICF target

et al. 2021

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Relativistic self-focusing of an intense laser pulse with hot magnetized plasma in the presence of a helical magnetostatic wiggler

Abedi‐Varaki

Jafari

2017

Physics of Plasmas

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In this paper, we study the nonlinear interaction of a circularly polarized laser pulse propagating through a hot magnetized plasma in the presence of a helical magnetostatic wiggler. A non-linear equation that describes the spot-size of the laser beam for both left- and right-hand polarizations has been derived. Non-linear dispersion relation describing the evolution of the laser frequency propagating through the hot magnetized plasma has been obtained. The effect of the wiggler magnetic field strength on the evolution of the laser spot-size has been discussed. The results indicate that for the right-hand polarization with increasing wiggler magnetic field strength, the laser spot-size decreases and the laser pulse becomes more focused. On the contrary, for the left-hand polarization, the self-focusing decreases with increasing wiggler magnetic field strength. Besides, it was found that in the right-hand polarization, the laser spot-size increases with the increasing plasma temperature, and the laser beam becomes more defocused. Furthermore, for the left-hand polarization, the laser self-focusing increases with the decreasing plasma temperature. Further numerical results revealed that by increasing the wiggler field strength, the normalized laser power increases significantly.

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Strong self-focusing for laser interaction with DT fusion target

Kamboj

Thakur

Ghotra

et al. 2019

INTERNATIONAL CONFERENCE ON PHOTONICS, METAMATERIALS &Amp; PLASMONICS: PMP-2019

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Interaction of a self-focused laser beam with a DT fusion target in a plasma-loaded cone-guided ICF scheme

Cited by 4 publications

References 17 publications

Optimizing laser focal spot size using self-focusing in a cone-guided fast-ignition ICF target

Optimizing laser focal spot size using self-focusing in a cone-guided fast-ignition ICF target

Relativistic self-focusing of an intense laser pulse with hot magnetized plasma in the presence of a helical magnetostatic wiggler

Strong self-focusing for laser interaction with DT fusion target

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