Ideal Laser-Beam Propagation through High-Temperature Ignition Hohlraum Plasmas

Froula, D. H.; Divol, L.; Meezan, N. B.; Dixit, S.; Moody, J. D.; Neumayer, P.; Pollock, B.; Ross, J. S.; Glenzer, S. H.

doi:10.1103/physrevlett.98.085001

Cited by 65 publications

(20 citation statements)

References 17 publications

(11 reference statements)

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“…Figure 8 shows that the SBS peaks early in time when the plasma is cold and then, in the 2-mm long target, it drops below detection as the plasma temperature increases. For electron temperatures above 3 keV, the total backscatter is reduced below 1% for intensities less than 2.5 × 10 15 W-cm −2 [8]. When the plasma length, the SBS remains significant throughout the experiment despite the increasing electron temperature.…”

Section: Low-density Regimementioning

confidence: 81%

“…This design has been used to study laserplasma interaction at high temperatures (T e = 2−3 keV) and low densities (n e = 5−10% n cr ). At such conditions, stimulated Brillouin scattering (SBS) dominates the interactions, while stimulated Raman scattering (SRS) remains energetically insignificant [8]. Previous studies have used Thomson scattering to characterize the bulk hydrodynamics in this standard low-density platform along the interaction beam path [12,13].…”

Section: Standard Low-density Designmentioning

confidence: 99%

“…A 351 nm interaction beam propagates along the hohlraum axis and therefore interact with a long-scale under-dense plasma. This geometry allows the measurements of both the backscattered and forward scattered light and provides a complete accounting of the energy in the interaction beam [8,9].…”

Section: Standard Low-density Designmentioning

confidence: 99%

“…A standard design for gas-filled cylindrical cylinders ("hohlraums") has been developed over several years [6,7] for use at the OMEGA Laser Facility to study laserplasma instabilities [8][9][10][11]. A 351 nm interaction beam propagates along the hohlraum axis and therefore interact with a long-scale under-dense plasma.…”

Section: Standard Low-density Designmentioning

confidence: 99%

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Experimental basis for laser-plasma interactions in ignition hohlraums at the National Ignition Facility

et al. 2010

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A series of laser plasma interaction experiments at OMEGA (LLE, Rochester) using gas-filled hohlraums shed light on the behavior of stimulated Raman scattering and stimulated Brillouin scattering at various plasma conditions encountered in indirect drive ignition designs. We present detailed experimental results that quantify the density, temperature, and intensity thresholds for both of these instabilities. In addition to controlling plasma parameters, the National Ignition Campaign relies on optical beam smoothing techniques to mitigate backscatter. We show that polarization smoothing is effective at controlling backscatter. These results provide an experimental basis for forthcoming experiments on National Ignition Facility.

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Section: Low-density Regimementioning

confidence: 81%

Section: Standard Low-density Designmentioning

confidence: 99%

Section: Standard Low-density Designmentioning

confidence: 99%

Section: Standard Low-density Designmentioning

confidence: 99%

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Experimental basis for laser-plasma interactions in ignition hohlraums at the National Ignition Facility

et al. 2010

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“…Present laser facilities designed for ICF study almost all operate at blue light (3ω), such as the National Ignition Facility [2], the Shenguang series [3,4], the OAMEG [5] and the Laser Mégajoule facility [6], because 3ω has the advantages of a higher laser deposition [7,8] and a lower LPI [9] than green light (2ω). However, 3ω is generated via the frequency-tripling technique with a relatively low efficiency, and in addition, it has a relatively low damage threshold for the optic components in the final optic assembly [10].…”

Section: Introductionmentioning

confidence: 99%

Foam Au driven by 4ω–2ω ignition laser pulse for inertial confinement fusion

Lan

Song

2017

Physics of Plasmas

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Green light (2ω) has the potential to drive ignition target for laser fusion with significantly more energy than blue light (3ω) and a relatively higher damage threshold for the optic components in the final optic assembly, but it has issues of a relatively low laser to x-ray conversion efficiency and a hard x-ray spectrum as compared to 3ω. In this paper, we propose to drive a foam hohlraum wall with an ignition laser pulse by taking a 4ω laser at the pre-pulse and a 2ω laser at the main-pulse, called as 4ω -2ω ignition pulse. This novel design has the following advantages: (1) benefiting from 2ω of its relatively high energy output and low damage threshold during main-pulse; (2) benefiting from foam in its relatively high laser to x-ray conversion efficiency and relatively low M-band fraction in re-emission; (3) benefiting from 4ω of its low LPI during pre-pulse. From our 1D simulations with Au material, the laser to x-ray conversion in a foam driven by 4ω -2ω pulse has an increase of 28% as compared to a solid target driven by 3ω with the same pulse shape. The relatively thin optical depth of foam is one of the main reasons for the increase of laser to x-ray conversion efficiency inside a foam target.

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Optical Smoothing of High-Power Lasers and Implications for Laser–Plasma Instabilities

Michel

2023

Graduate Texts in Physics

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Ideal Laser-Beam Propagation through High-Temperature Ignition Hohlraum Plasmas

Cited by 65 publications

References 17 publications

Experimental basis for laser-plasma interactions in ignition hohlraums at the National Ignition Facility

Experimental basis for laser-plasma interactions in ignition hohlraums at the National Ignition Facility

Foam Au driven by 4ω–2ω ignition laser pulse for inertial confinement fusion

Optical Smoothing of High-Power Lasers and Implications for Laser–Plasma Instabilities

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