Reflection of intense laser light from microstructured targets as a potential diagnostic of laser focus and plasma temperature

Jarrett, J.H.; King, M.; Gray, R. J.; Neumann, Nico W.; Döhl, Leonard N. K.; Baird, C. D.; Ebert, Tina; Hesse, Markus C.; Tebartz, A.; Rusby, Dean; Woolsey, N. C.; Neely, D.; Roth, Markus; McKenna, P.

doi:10.1017/hpl.2018.63

Cited by 6 publications

(5 citation statements)

References 34 publications

(33 reference statements)

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“…He contributed to the study published in Ref. [10], in which diffraction and speckle patterns measured in the spatialintensity profile of laser light reflected during the interaction with a microstructured target are investigated experimentally, and the potential to apply this as a diagnostic of laser focus and plasma temperature is explored. Using modelling, the possibility of applying this as a diagnostic of the evolving plasma surface is discussed.…”

Section: Scientific Highlights Through Publications In Hplsementioning

confidence: 99%

“…He published two papers on this topic in HPLSE [12,13] . In an early work in 2014 [10] , the effects of target pre-heating and expansion on THz radiation production from intense laser-solid interactions were first explored. The total energy of the THz radiation is found to decrease by approximately a factor of two when preheating the target compared to a cold target reference, and is attributed to an increase in the scale length of the preformed plasma in the region in which the THz radiation is generated.…”

Section: Scientific Highlights Through Publications In Hplsementioning

confidence: 99%

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HPLSE editorial tribute to Professor David Neely

Danson

McKenna

2021

High Pow Laser Sci Eng

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David Neely was an internationally recognised scientist who formed collaborations and friendships across the world. His passion for his work always shone through. He always made time for early-career scientists and became a mentor and supervisor to many. He was an active Editorial Board Member of the international journal High Power Laser Science and Engineering. Sadly, David was taken from us much too early. In this Editorial we pay tribute to his work through his publications in the journal.

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Section: Scientific Highlights Through Publications In Hplsementioning

confidence: 99%

Section: Scientific Highlights Through Publications In Hplsementioning

confidence: 99%

HPLSE editorial tribute to Professor David Neely

Danson

McKenna

2021

High Pow Laser Sci Eng

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“…For the microstructured front, the spot size is slightly bigger and the profile is more homogeneous. Precisely these data and a detailed analysis can be found in the study by Jarrett et al 32…”

Section: A Reflected and Back-scattered Lightmentioning

confidence: 99%

Enhanced brightness of a laser-driven x-ray and particle source by microstructured surfaces of silicon targets

et al. 2020

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The production of intense x-ray and particle sources is one of the most remarkable aspects of high energy laser interaction with a solid target. Wide application of these laser-driven secondary sources requires a high yield, which is partially limited by the amount of laser energy absorbed by the target. Here, we report on the enhancement of laser absorption and x-ray and particle flux by target surface modifications. In comparison to targets with flat front surfaces, our experiments show exceptional laser-to-target performance for our novel cone-shaped silicon microstructures. The structures are manufactured via laser-induced surface structuring. Spectral and spatial studies of reflectance and x-ray generation reveal significant increases of the silicon K a line and a boost of the overall x-ray intensity, while the amount of reflected light decreases. Also, the proton and electron yields are enhanced, but both temperatures remain comparable to those of flat foil targets. We support the experimental findings with 2D particle in cell simulations to identify the mechanisms responsible for the strong enhancement. Our results demonstrate how custom surface structures can be used to engineer high power laser-plasma sources for future applications.

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“…David's work spanned the entire field of high power laser science, from laser technology to plasma physics, facility operation and diagnostic development [31,32]. He was interested in what could be learned from radiation and charged particles emitted from the laser focal spot [33][34][35] and reciprocally how laser and target properties could be manipulated to produce new radiation sources [36][37][38]. He also played a pivotal role in the development of proton deflectometry with RCF imaging [39], using them to measure electromagnetic fields in laser-plasmas [40,41] and discharge pulses propagating along conducting surfaces [42].…”

Section: Introductionmentioning

confidence: 99%

Measuring magnetic fields in laser-driven coils with dual-axis proton deflectometry

Bradford

Dearling

Ehret

et al. 2021

Plasma Phys. Control. Fusion

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By driving hot electrons between two metal plates connected by a wire loop, high power lasers can generate multi-tesla, quasi-static magnetic fields in miniature coil targets. Many experiments involving laser-coil targets rely on proton deflectometry directed perpendicular to the coil axis to extract a measurement of the magnetic field. In this paper, we show that quantitative measurements using perpendicular probing are complicated by the presence of GV m −1 electric fields in the target that develop on sub-ns timescales. Probing parallel to the coil axis with fiducial grids is shown to reliably separate the electric and magnetic field measurements, giving current estimates of I ≈ 5 kA in 1 mm-and 2 mm-diameter wire loops. An analytic model of proton deflection in electric and magnetic fields is used to benchmark results from the particle-in-cell code and help deconvolve the magnetic and electric field deflections. Results are used to motivate a new experimental scheme that combines a * Authors to whom any correspondence should be addressed.Original Content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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Reflection of intense laser light from microstructured targets as a potential diagnostic of laser focus and plasma temperature

Cited by 6 publications

References 34 publications

HPLSE editorial tribute to Professor David Neely

HPLSE editorial tribute to Professor David Neely

Enhanced brightness of a laser-driven x-ray and particle source by microstructured surfaces of silicon targets

Measuring magnetic fields in laser-driven coils with dual-axis proton deflectometry

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