Heating of solid target in electron refluxing dominated regime with ultra-intense laser

Nakatsutsumi, M.; Kodama, R.; Aglitskiy, Y.; Akli, K. U.; Batani, D.; Baton, S. D.; Beg, F. N.; Benuzzi‐Mounaix, A.; Chen, S N; Clark, David; Davies, J. R.; Freeman, R. R.; Fuchs, Julien; Green, J S; Gregory, Christopher D.; Guillou, P.; Habara, H.; Heathcote, R.; Hey, D.; Highbarger, K.; Jaanimagi, P. A.; Key, M.H.; Kœnig, M.; Krushelnick, K.; Lancaster, Kate; Loupias, B.; Ma, T.; MacPhee, A. G.; Mackinonn, A J; Mima, K.; Morace, A.; Nakamura, Hirotaka; Norryes, P A; Piazza, Daniele; Rousseaux, C.; Stephans, R B; Storm, M.; Tampo, M.; Theobald, W.; Woerkom, Linn Van; Weber, R.; Wei, M. S.; Woolsey, N. C.

doi:10.1088/1742-6596/112/2/022063

Cited by 9 publications

(10 citation statements)

References 16 publications

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“…2(d)]. All of these results are consistent with previous reports of bulk target heating increase when reducing the target surface area [16,22]. We also observe that the hot electron sheath becomes more uniform when we reduce the target surface area.…”

supporting

confidence: 91%

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Hot Electrons Transverse Refluxing in Ultraintense Laser-Solid Interactions

Buffechoux¹,

Pšikal²,

Nakatsutsumi³

et al. 2010

Phys. Rev. Lett.

105

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We have analyzed the coupling of ultraintense lasers (at ∼2×10{19} W/cm{2}) with solid foils of limited transverse extent (∼10 s of μm) by monitoring the electrons and ions emitted from the target. We observe that reducing the target surface area allows electrons at the target surface to be reflected from the target edges during or shortly after the laser pulse. This transverse refluxing can maintain a hotter, denser and more homogeneous electron sheath around the target for a longer time. Consequently, when transverse refluxing takes places within the acceleration time of associated ions, we observe increased maximum proton energies (up to threefold), increased laser-to-ion conversion efficiency (up to a factor 30), and reduced divergence which bodes well for a number of applications.

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supporting

confidence: 91%

“…It is this hot tail that is measured by the stack. The third diagnostic records 2D time-resolved images of the thermal emission [16] from the bulk electrons at the target surface that are collisionally heated by the hot electrons.…”

mentioning

confidence: 99%

Hot Electrons Transverse Refluxing in Ultraintense Laser-Solid Interactions

Buffechoux¹,

Pšikal²,

Nakatsutsumi³

et al. 2010

Phys. Rev. Lett.

105

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“…At intensities of the order of 10 19 W/cm 2 , the laser drives a high current through the sample which heats the target (Figure 1) through Ohmic/resistive losses [4][5][6][7]. Laser-to-electron energy conversion efficiency is ∼10 -1 and the resulting heat deposition can be up to keV at target center down to 100eV at the target edges.…”

Section: Indirect Heating In Laser Targetmentioning

confidence: 99%

“…This measurement shows the temporal decay of the heated sample on one axis and the 1-D spatial extent of the heated sample on the other axis. Narrowband filters centered at 570nm [14] and 470nm [12] have been used to avoid excessive optical transition radiation (OTR) in 500-550nm range [7]. Attempts have been made to calibrate the transmissive optics and the streak camera in order to measure the absolute target emission at a single wavelength.…”

Section: Sample Temperature Diagnosticsmentioning

confidence: 99%

Feasibility study of measuring the temperature and pressure of warm dense matter.

Rambo¹,

Schwarz²

2008

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We have investigated the feasibility of making accurate measurements of the temperature and pressure of solid-density samples rapidly heated by the Z-Petawatt laser to warm dense matter (WDM) conditions, with temperatures approaching 100eV. The study focused specifically on the heating caused by laser generated proton beams. Based on an extensive literature search and numerical investigations, a WDM experiment is proposed which will accurately measure temperature and pressure based on optical emission from the surface and sample expansion velocity. 4 5

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“…As the beam propagates, a significant fraction of the laser energy is coupled into the targetʼs depth [1][2][3][4][5]. The transport of intense current (>1 MA) of REB into dense matter is of critical importance for various applications such as secondary sources of energetic particles [6] and radiation [7,8], and for isochoric heating of matter to temperatures relevant to the study of structural and dynamic properties of warm dense matter or high-energy-density (HED) matter [9][10][11][12][13][14]. This is also of interest in planetary science [15][16][17], astrophysics [18,19], or for the development of high-gain inertial confinement fusion schemes [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Transport of kJ-laser-driven relativistic electron beams in cold and shock-heated vitreous carbon and diamond

et al. 2020

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We report experimental results on relativistic electron beam (REB) transport in a set of cold and shock-heated carbon samples using the high-intensity kilojoule-class OMEGA EP laser. The REB energy distribution and transport were diagnosed using an electron spectrometer and x-ray fluorescence measurements from a Cu tracer buried at the rear side of the samples. The measured rear REB density shows brighter and narrower signals when the targets were shock-heated. Hybrid PIC simulations using advanced resistivity models in the target warm-dense-matter (WDM) conditions confirm this observation. We show that the resistivity response of the media, which governs the selfgenerated resistive fields, is of paramount importance to understand and correctly predict the REB transport.

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Heating of solid target in electron refluxing dominated regime with ultra-intense laser

Cited by 9 publications

References 16 publications

Hot Electrons Transverse Refluxing in Ultraintense Laser-Solid Interactions

Hot Electrons Transverse Refluxing in Ultraintense Laser-Solid Interactions

Feasibility study of measuring the temperature and pressure of warm dense matter.

Transport of kJ-laser-driven relativistic electron beams in cold and shock-heated vitreous carbon and diamond

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