Two-plasmon decay instability’s signature in spectral lines and spectroscopic measurements of charge exchange rate in a femtosecond laser-driven cluster-based plasma

Oks, Eugene; Dalimier, E.; Faenov, A. Ya.; Pikuz, T. A.; Fukuda, Yuji; Jinno, S.; Sakaki, H.; Kotaki, Hajime; Pirozhkov, Alexander S.; Hayashi, Yukio; Skobelev, I. Yu.; Kawachi, Tetsuya; Kando, M.; Kondo, Kotaro

doi:10.1088/0953-4075/47/22/221001

Cited by 9 publications

(11 citation statements)

References 42 publications

(49 reference statements)

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“…The nonlinear phenomena caused by the strong coupling of the electromagnetic wave "t 1 " of the laser at frequency ω L (and eventually its second harmonic "t 2 " at 2ω L ) with the created plasma may involve the Langmuir turbulence "l" at the electron plasma frequency ω pe equal to ω L (or ω L /2) and the ion acoustic turbulence "s" at the ion plasma frequency ω pi . The processes discovered in the present work, due to high-resolution X-ray spectroscopy, are the Two Plasmon Decay instability TPD [1], the Parametric Decay Instability PDI and the Second Harmonic Generation SHG [2]. For TPD the nonlinear process is summarized by the balance equation t 1 → l + l. For PDI the process involved is t 1 → l + s and as for SHG it can be explained either by the process l+l → t 2 or l + t 1 → t 2 .…”

Section: Introductionmentioning

confidence: 73%

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X-ray spectroscopy of super-intense laser-produced plasmas for the study of nonlinear processes. Comparison with PIC simulations

Dalimier

Faenov

Oks

et al. 2017

J. Phys.: Conf. Ser.

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Review of the phenomenon of dips in spectral lines emitted from plasmas and their applications E Oks, E Dalimier, A Faenov et al.Evolution of the frequency spectrum of a relativistically strong laser pulse in a plasma S V Bulanov, N M Naumova, T Zh Esirkepov et al. Abstract. We present X-ray spectroscopic diagnostics in femto-second laser-driven experiments revealing nonlinear phenomena caused by the strong coupling of the laser radiation with the created plasma. Among those nonlinear phenomena, we found the signatures of the Two Plasmon Decay (TPD) instability in a laser-driven CO 2 cluster-based plasma by analyzing the Langmuir dips in the profile of the O VIII Lyε line, caused by the Langmuir waves created at the high laser intensity 3 10 18 Wcm -2 . With similar laser intensities, we reveal also the nonlinear phenomenon of the Second Harmonic Generation (SHG) of the laser frequency by analyzing the nonlinear phenomenon of satellites of Lyman δ and ε lines of Ar XVII. In the case of relativistic laser-plasma interaction we discovered the Parametric Decay Instability (PDI)-induced ion acoustic turbulence produced simultaneously with Langmuir waves via irradiation of thin Si foils by laser intensities of 10 21 Wcm -2 .

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Section: Introductionmentioning

confidence: 73%

“…At KPSI, the spectroscopic analysis of the Langmuir dips of O VIII Lyε line revealed the instability process TPD and its characteristics [1]. Let us first recall the mechanism of Langmuir dips formation adding some improvements in their spectral line shape characteristics.…”

Section: Discovery Of the Two Plasmon Decay Tpd Instabilitymentioning

confidence: 99%

X-ray spectroscopy of super-intense laser-produced plasmas for the study of nonlinear processes. Comparison with PIC simulations

Dalimier

Faenov

Oks

et al. 2017

J. Phys.: Conf. Ser.

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“…The electric quantum number labels Stark components of Ly-lines. Equation (29) shows that for a given electron density N e , the locations of L-dips are controlled by the product qk.…”

Section: Analytical Results and Applications To Magnetic Fusionmentioning

confidence: 99%

Stark broadening of hydrogen/deuterium spectral lines by a relativistic electron beam: analytical results and possible applications to magnetic fusion edge plasmas

Oks

Sanders

2018

J. Phys. Commun.

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We present a theory of the Stark broadening of hydrogen/deuterium spectral lines by a relativistic electron beam (REB). The theory is developed analytically by using an advanced formalism. We discuss the possible application of these analytical results to magnetic fusion edge plasmas, taking into account also the major outcome of the interaction of a REB with plasmas: the development of strong Langmuir waves.

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“…The separation between the experimental L-dips was found to scale with the electron density N e as N 1/2 e -just as it was expected from the theory of the L-dips. Another experimental example deals with a femtosecond laserdriven cluster-based plasma [35]. The experiments have been performed at Kansai Photon Science Institute, Japan Atomic Energy Agency (KPSI, JAEA, Japan) where two Ti:sapphire laser facilities (wavelength approximately 800 nm) were used.…”

Section: Using Langmuir-waves-cause Dips In Hydrogenic Line Profiles mentioning

confidence: 99%

“…The spatially resolved X-ray spectra have been obtained by employing a focusing spectrometer with spatial resolution FSSR-1D. Figure 1.5 shows a typical experimental spectrum of the O VIII Ly-epsilon line obtained at the laser intensity 3 × 10 18 W/cm 2 [35]. Two solid vertical lines correspond to the positions of two L-dips: one dip in the blue wing at -20 mA from the slightly shifted center of the line, another L-dip in the red wing at 37 mA from the slightly shifted position of the center line, as shown in Fig.…”

Section: Using Langmuir-waves-cause Dips In Hydrogenic Line Profiles mentioning

confidence: 99%

Electron Density

2017

Diagnostics of Laboratory and Astrophysical Plasmas Using Spectral Lineshapes of One-, Two-, and Three-Electron Systems

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The electron density N e is the primary plasma parameter. In laboratory and astrophysical plasmas, it varies over 20 orders of magnitude (in distinction to any other plasma parameter): from N e ∼ (10 3 -10 4 ) cm −3 in astrophysical objects called H II regions to N e ∼ (10 23 -10 24 ) cm −3 in plasmas produced by very powerful lasers. (For comparison, the electron temperature T e of these two extreme types of plasmas varies only by about three orders of magnitude: from ∼1 eV in H II regions to ∼1 keV in plasmas produced by very powerful lasers.) Obviously, there is no single universal method for measuring N e that can be applied over 20 orders of magnitude. The overwhelming majority of method for measuring N e are based on Stark broadening (SB) of various spectral lines by ion and electron microfields in plasmas.SB of spectral lines in plasmas is controlled by the electron density N e and to some extent by the electron (T e ) and ion (T i ) temperatures. Therefore, it was used for measuring the electron density in a very broad range by choosing appropriate spectral lines. The experimental determination of the electron density relies mostly on measuring the Stark width because it is typically by an order of magnitude greater than the Stark shift.Hydrogenic radiators are the most appropriate for this purpose. The overwhelming majority of the states of hydrogenic radiators 3 Diagnostics of Laboratory and Astrophysical Plasmas Using Spectral Lineshapes of One-, Two-, and Three-Electron Systems Downloaded from www.worldscientific.com by 34.215.51.103 on 05/10/18. For personal use only. Diagnostics of Laboratory and Astrophysical Plasmaspossess permanent dipole moments, thus, making these radiators more sensitive to ion and electron microfields in plasmas than non-hydrogenic radiators. The underlying theories are presented in Appendices A-E, G-I, and L. In practice, there could be competing broadening mechanisms, such as, Doppler, instrumental and Zeeman broadenings, as well as a self-absorption. Therefore, the task is to find practical methods for extracting the Stark width despite the competing broadening effects, some of which could actually exceed the SB in certain situations. These methods are the focus of the subsequent sections. Using the Intense (low-n) Lines of Hydrogenic Spectral SeriesIn hydrogen atoms and hydrogenlike ions (hereafter, hydrogenic atoms, for brevity), in spectral series, i.e., in radiative transitions between the upper states of various principal quantum number n and the fixed lower state of the principal quantum number n 0 , the most intense are the lines, corresponding to n = n 0 + 1 (α-line), n 0 + 2 (β-line), n 0 +3 (γ-line), n 0 +4 (δ-line) -in order of diminishing intensity. So, on the first glance, it seems that one should use the most intense lines, like the α-line or the β-line. However, there is a trade-off. The SB of the α-line is the smallest out of the spectral series. The SB increases along the spectral series: roughly speaking, as ∼n 2 for the ion broadening and ∼n 4 for the e...

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Two-plasmon decay instability’s signature in spectral lines and spectroscopic measurements of charge exchange rate in a femtosecond laser-driven cluster-based plasma

Cited by 9 publications

References 42 publications

X-ray spectroscopy of super-intense laser-produced plasmas for the study of nonlinear processes. Comparison with PIC simulations

X-ray spectroscopy of super-intense laser-produced plasmas for the study of nonlinear processes. Comparison with PIC simulations

Stark broadening of hydrogen/deuterium spectral lines by a relativistic electron beam: analytical results and possible applications to magnetic fusion edge plasmas

Electron Density

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