&lt;title&gt;Focal spot smoothing and tailoring for high-power laser applications&lt;/title&gt;

Pepler, D.A.; Danson, C.; Bann, R.; Ross, I. N.; Stevenson, R. M.; Norman, Michael; Desselberger, M.; Willi, O.

doi:10.1117/12.154491

Cited by 4 publications

(2 citation statements)

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“…The beams have a pulse duration of 7 ns (FWHM) and their energy was measured to be 28±4 J. They are spatially smoothed using random phase plates (RPP) 31 , manufactured by Scitech Precision Ltd., a spin-off from Rutherford Appleton Laboratory, Didcot, UK. The RPP create a top-hat focus profile with a 1 mm diameter on the target, resulting in a laser intensity on target I ≈5 × 10 11 W cm −2 and in transversally uniform plasma parameters within this area.…”

Section: Methodsmentioning

confidence: 99%

Experimental discrimination of ion stopping models near the Bragg peak in highly ionized matter

et al. 2017

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The energy deposition of ions in dense plasmas is a key process in inertial confinement fusion that determines the α-particle heating expected to trigger a burn wave in the hydrogen pellet and resulting in high thermonuclear gain. However, measurements of ion stopping in plasmas are scarce and mostly restricted to high ion velocities where theory agrees with the data. Here, we report experimental data at low projectile velocities near the Bragg peak, where the stopping force reaches its maximum. This parameter range features the largest theoretical uncertainties and conclusive data are missing until today. The precision of our measurements, combined with a reliable knowledge of the plasma parameters, allows to disprove several standard models for the stopping power for beam velocities typically encountered in inertial fusion. On the other hand, our data support theories that include a detailed treatment of strong ion-electron collisions.

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Section: Methodsmentioning

confidence: 99%

Experimental discrimination of ion stopping models near the Bragg peak in highly ionized matter

et al. 2017

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“…Both beams are frequency doubled (2ω) with wavelengths of 527 nm and 532 nm, an energy of 30 J, and a pulse length of 7 ns at full width at half maximum (FWHM). The beams are spatially smoothed by using random phase plates (RPP) [48], which create a top-hat focus profile with a 1-mm diameter on the target. The plasma parameters are obtained from hydrodynamic-simulation data with the twodimensional radiative RALEF2D code [49,50].…”

Section: A Plasma Targetmentioning

confidence: 99%

Predictions for the energy loss of light ions in laser-generated plasmas at low and medium velocities

et al. 2015

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The energy loss of light ions in dense plasmas is investigated with special focus on low to medium projectile energies, i.e., at velocities where the maximum of the stopping power occurs. In this region, exceptionally large theoretical uncertainties remain and no conclusive experimental data are available. We perform simulations of beam-plasma configurations well suited for an experimental test of ion energy loss in highly ionized, laser-generated carbon plasmas. The plasma parameters are extracted from two-dimensional hydrodynamic simulations, and a Monte Carlo calculation of the charge-state distribution of the projectile ion beam determines the dynamics of the ion charge state over the whole plasma profile. We show that the discrepancies in the energy loss predicted by different theoretical models are as high as 20-30%, making these theories well distinguishable in suitable experiments.

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Electron number density measurements in magnesium laser produced plumes

Doyle

Martin

Al‐Khateeb

et al. 1998

Applied Surface Science

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<title>Focal spot smoothing and tailoring for high-power laser applications</title>

Cited by 4 publications

References 0 publications

Experimental discrimination of ion stopping models near the Bragg peak in highly ionized matter

Experimental discrimination of ion stopping models near the Bragg peak in highly ionized matter

Predictions for the energy loss of light ions in laser-generated plasmas at low and medium velocities

Electron number density measurements in magnesium laser produced plumes

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