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Autore: Grafiati

Pubblicato: 8 giugno 2024

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1

Lazar, M., R. Schlickeiser, R. Wielebinski e S. Poedts. "COSMOLOGICAL EFFECTS OF WEIBEL-TYPE INSTABILITIES". Astrophysical Journal 693, n. 2 (5 marzo 2009): 1133–41. http://dx.doi.org/10.1088/0004-637x/693/2/1133.

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2

SUGIE, M., K. OGAWA e T. OKADA. "DEVELOPMENT OF ELECTROMAGNETIC WEIBEL-TYPE INSTABILITIES IN ANISOTROPIC PLASMAS". International Journal of Modern Physics B 21, n. 03n04 (10 febbraio 2007): 637–41. http://dx.doi.org/10.1142/s0217979207042458.

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3

Lazar, M., R. Schlickeiser e T. Skoda. "Cosmological magnetic field seeds produced by the Weibel instabilities". Proceedings of the International Astronomical Union 6, S271 (giugno 2010): 387–88. http://dx.doi.org/10.1017/s1743921311017923.

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AbstractThe source of the cosmological magnetic field is still unknown because the widely invoked dynamo processes are only able to regenerate and amplify some initial magnetic field seeds. In the hot and highly ionized intergalactic matter such magnetic field seeds can easily be produced by the (electro-)magnetic instabilities of Weibel type. Here we discuss suplementary mechanisms that can make these Weibel created fields to evolve at large scales presently observed in galaxies and clusters and can also enhance these magnetic field seeds after the dissipation.

4

Inglebert, A., A. Ghizzo, T. Reveille, D. Del Sarto, P. Bertrand e F. Califano. "A multi-stream Vlasov modeling unifying relativistic Weibel-type instabilities". EPL (Europhysics Letters) 95, n. 4 (28 luglio 2011): 45002. http://dx.doi.org/10.1209/0295-5075/95/45002.

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5

LAZAR, M., A. SMOLYAKOV, R. SCHLICKEISER e P. K. SHUKLA. "A comparative study of the filamentation and Weibel instabilities and their cumulative effect. I. Non-relativistic theory". Journal of Plasma Physics 75, n. 1 (febbraio 2009): 19–33. http://dx.doi.org/10.1017/s0022377807007015.

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AbstractA comparative study of the electromagnetic instabilities in anisotropic unmagnetized plasmas is undertaken. The instabilities considered are the filamentation and Weibel instability, and their cumulative effect. Dispersion relations are derived and the growth rates are plotted systematically for the representative cases of non-relativistic counterstreaming plasmas with isotropic or anisotropic velocity distributions functions of Maxwellian type. The pure filamentation mode is attenuated by including an isotropic Maxwellian distribution function. Moreover, it is observed that counterstreaming plasmas can be fully stabilized by including bi-Maxellian distributions with a negative thermal anisotropy. This effect is relevant for fusion plasma experiments. Otherwise, for plasma streams with a positive anisotropy the filamentation and Weibel instabilities cumulate leading to a growth rate by orders of magnitude larger than that of a simple filamentation mode. This is noticeable for the quasistatic magnetic field generated in astrophysical sources, and which is expected to saturate at higher values and explain the non-thermal emission observed.

6

Skoutnev, V., A. Hakim, J. Juno e J. M. TenBarge. "Temperature-dependent Saturation of Weibel-type Instabilities in Counter-streaming Plasmas". Astrophysical Journal 872, n. 2 (21 febbraio 2019): L28. http://dx.doi.org/10.3847/2041-8213/ab0556.

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7

Sarrat, M., D. Del Sarto e A. Ghizzo. "Fluid description of Weibel-type instabilities via full pressure tensor dynamics". EPL (Europhysics Letters) 115, n. 4 (1 agosto 2016): 45001. http://dx.doi.org/10.1209/0295-5075/115/45001.

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8

STOCKEM, A., M. LAZAR, P. K. SHUKLA e A. SMOLYAKOV. "A comparative study of the filamentation and Weibel instabilities and their cumulative effect. II. Weakly relativistic beams". Journal of Plasma Physics 75, n. 4 (agosto 2009): 529–43. http://dx.doi.org/10.1017/s002237780800768x.

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AbstractCounterstreaming plasma systems with intrinsic temperature anisotropies are unstable against the excitation of Weibel-type instabilities, namely, filamentation and Weibel instabilities, and their cumulative effect. Here, the analysis is extended to counterstreaming plasmas with weakly relativistic bulk velocities, while the thermal velocities are still considered to be non-relativistic. Such plasma systems are relevant for fusion plasma experiments and the more violent astrophysical phenomena, such as jets in gamma-ray burst sources. Simple analytical forms of the dispersion relations are derived in the limit of a small transverse temperature or a large temperature anisotropy of the beams. The aperiodic growing solutions are plotted systematically for the representative cases chosen in Paper I (Lazar et al. 2009 J. Plasma Phys. 75, in press). In the limit of slow non-relativistic plasma flows, the numerical solutions fit well with those obtained in Paper I, but for weakly relativistic streams an important deviation is found.

9

OKADA, T., I. SAJIKI e K. SATOU. "Weibel instability by ultraintense laser pulses". Laser and Particle Beams 17, n. 3 (luglio 1999): 515–18. http://dx.doi.org/10.1017/s0263034699173191.

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Particle-in-cell (PIC) simulations show that an anisotropic electron velocity distribution is demonstrated by ultraintense laser pulses in underdense plasmas. Recently, it is reported that the anisotropy has been experimentally demonstrated in laser-produced plasmas. It is also pointed out that gigagauss magnetic fields are generated by ultraintense laser pulses. We have already published that the Weibel-type electromagnetic instabilities can be theoretically excited by electrons in a velocity distribution with anisotropic temperature. If these electromagnetic waves are excited, the target may have a possibility not only to give rise to a new type of energy loss mechanism but also to influence the implosion characteristics. In this work, we present PIC simulation of the interaction of ultraintense laser pulses with plasmas. Intense self-generated magnetic fields is produced by the mechanism of Weibel instability in underdense plasmas.

10

Inglebert, A., A. Ghizzo, T. Reveille, D. Del Sarto, P. Bertrand e F. Califano. "Multi-stream Vlasov model for the study of relativistic Weibel-type instabilities". Plasma Physics and Controlled Fusion 54, n. 8 (30 maggio 2012): 085004. http://dx.doi.org/10.1088/0741-3335/54/8/085004.

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11

Lazar, M., R. Schlickeiser e P. K. Shukla. "Cumulative effect of the Weibel-type instabilities in symmetric counterstreaming plasmas with kappa anisotropies". Physics of Plasmas 15, n. 4 (2008): 042103. http://dx.doi.org/10.1063/1.2896232.

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12

Doğan, Mustafa, e Kazım Yavuz Ekşi. "Stimulated emission–based model of fast radio bursts". Monthly Notices of the Royal Astronomical Society 494, n. 1 (13 marzo 2020): 876–84. http://dx.doi.org/10.1093/mnras/staa708.

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ABSTRACT Fast radio bursts (FRBs) are bright, short-duration radio transients with very high brightness temperatures implying highly coherent emission. We suggest that the FRBs are caused by the self-focusing of an electron beam interacting with an ambient plasma right beyond the light cylinder radius of a neutron star. The magnetic field at the light cylinder radius is relatively high that can accommodate both young Crab-like systems and old millisecond pulsars addressing the diverse environments of FRBs. At the first stage, the intense pulsed-beam passing through the background plasma causes instabilities such that the trapped particles in local Buneman-type cavitons saturate the local field. The beam is then radially self-focused due to the circular electric field developed by the two-stream instability that leads to Weibel instability in the transverse direction. Finally, the non-linear saturation of the Weibel instability results in the self-modulational formation of solitons due to plasmoid instability. The resonant solitary waves are the breather-type solitons hosting relativistic particles with self-excited oscillations. The analytical solutions obtained for non-linear dispersion and solitons suggest that, near the current sheets, the relativistic bunches are accelerated/amplified by klystron-like structures due to self-excited oscillations by the induced local electric field. Boosted coherent radio emission propagates through a narrow cone with strong focusing due to radial electric field and magnetic pinching. The non-linear evolution of solitons and the stimulated emission are associated with the Buneman instability and the possibility of the presence of nanosecond shots in FRBs are investigated.

13

Mirón-Granese, Nahuel, Esteban Calzetta e Alejandra Kandus. "Primordial Weibel instability". Journal of Cosmology and Astroparticle Physics 2022, n. 01 (1 gennaio 2022): 028. http://dx.doi.org/10.1088/1475-7516/2022/01/028.

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Abstract We study the onset of vector instabilities in the post-inflationary epoch of the Universe as a mechanism for primordial magnetic fields amplification. We assume the presence of a charged spectator scalar field arbitrarily coupled to gravity during Inflation in its vacuum de Sitter state. Gravitational particle creation takes place at the transition from Inflation to the subsequent Reheating stage and thus the vacuum field state becomes an excited many particles one. Consequently this state can be described as a real fluid, and we build out the hydrodynamic framework using second order theories for relativistic fluids with a relaxation time prescription for the collision integral. Given the high-temperature regime and the vanishing scalar curvature of the Universe during Reheating (radiation-dominated-type era), the fluid can be regarded as a conformal one. The large quantum fluctuations induced by the rapid transition from inflationary to effectively radiation dominated expansion become statistical fluctuations whereby both a charge excess and anisotropic pressures are produced in any finite domain. The precise magnitude of the effect for each scale is determined by the size of the averaging domain and the coupling to curvature. We look at domains which are larger than the horizon at the beginning of Reheating, but much smaller than our own horizon, and show that in a finite fraction of them the anisotropy and charge excess provide suitable conditions for a Weibel instability. If moreover the duration of reheating is shorter than the relaxation time of the fluid, then this instability can compensate or even overcome the conformal dilution of a primordial magnetic field. We show that the non-trivial topology of the magnetic field encoded in its magnetic helicity is also amplified if present.

14

Lazar, M., R. Schlickeiser e P. K. Shukla. "Erratum: “Cumulative effect of the Weibel-type instabilities in symmetric counterstreaming plasmas with kappa anisotropies” [Phys. Plasmas 15, 042103 (2008)]". Physics of Plasmas 15, n. 7 (luglio 2008): 079901. http://dx.doi.org/10.1063/1.2953799.

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15

Garasev, M. A., Vl V. Kocharovsky, A. A. Nechaev, A. N. Stepanov e V. V. Kocharovsky. "The Coexistence of Orthogonal Current Structures and the Development of Different-Type Weibel Instabilities in Adjacent Regions of a Plasma Transition Layer with a Hot Electron Flow". Геомагнетизм и аэрономия 63, n. 1 (1 gennaio 2023): 12–27. http://dx.doi.org/10.31857/s0016794022060050.

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Abstract—By means of particle-in-cell numerical simulations, we find the possibility of the formation andlong-term coexistence of orthogonal current structures in adjacent layers of an inhomogeneous cold plasmapenetrated by a hot electron flow. The formationof these structures is shown to occur in a wide range ofparameters specifying collisionless expansion of high-energy electrons out of a dense plasma into a rarefiedplasma. These structures originate due to the development of Weibel instabilities of two different types thatare associated with qualitatively different anisotropic electron velocity distributions. Experiments with a laserplasma produced in the course of target ablation by means of quasi-cylindrical focusing of a high-power femtosecond-laser radiation beam are proposed in order to observe the predicted phenomenon

16

Garasev, M. A., Vl V. Kocharovsky, A. A. Nechaev, A. N. Stepanov e V. V. Kocharovsky. "The Coexistence of Orthogonal Current Structures and the Development of Different-Type Weibel Instabilities in Adjacent Regions of a Plasma Transition Layer with a Hot Electron Flow". Geomagnetism and Aeronomy 62, S1 (dicembre 2022): S10—S24. http://dx.doi.org/10.1134/s0016793222600436.

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17

Ghizzo, A., M. Sarrat e D. Del Sarto. "Vlasov models for kinetic Weibel-type instabilities". Journal of Plasma Physics 83, n. 1 (5 gennaio 2017). http://dx.doi.org/10.1017/s0022377816001215.

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The Weibel instability, driven by a temperature anisotropy, is investigated within different kinetic descriptions based on the semi-Lagrangian full kinetic and relativistic Vlasov–Maxwell model, on the multi-stream approach, which is based on a Hamiltonian reduction technique, and finally, with the full pressure tensor fluid-type description. Dispersion relations of the Weibel instability are derived using the three different models. A qualitatively different regime is observed in Vlasov numerical experiments depending on the excitation of a longitudinal plasma electric field driven initially by the combined action of the stream symmetry breaking and weak relativistic effects, in contrast with the existing theories of the Weibel instability based on their purely transverse characters. The multi-stream model offers an alternate way to simulate easily the coupling with the longitudinal electric field and particularly the nonlinear regime of saturation, making numerical experiments more tractable, when only a few moments of the distribution are considered. Thus a numerical comparison between the reduced Hamiltonian model (the multi-stream model) and full kinetic (relativistic) Vlasov simulations has been investigated in that regime. Although nonlinear simulations of the fluid model, including the dynamics of the pressure tensor, have not been carried out here, the model is strongly relevant even in the three-dimensional case.

18

Sarrat, M., D. Del Sarto e A. Ghizzo. "A pressure tensor description for the time-resonant Weibel instability". Journal of Plasma Physics 83, n. 1 (17 gennaio 2017). http://dx.doi.org/10.1017/s0022377816001264.

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We discuss a fluid model with inclusion of the complete pressure tensor dynamics for the description of Weibel-type instabilities in a counterstreaming beam configuration. Differently from the case recently studied in Sarrat et al. (Europhys. Lett., vol. 115, 2016, 45001), where perturbations perpendicular to the beams were considered, here we focus only on modes propagating along the beams. Such a configuration is responsible for the growth of two kinds of instabilities, the two-stream instability and the Weibel instability, which in this geometry becomes ‘time resonant’, i.e. propagating. This fluid description agrees with the kinetic one and makes it possible e.g. to identify the transition between non-propagating and propagating Weibel modes, already evidenced by Lazar et al. (J. Plasma Phys., vol. 76 (1), 2010, p. 49) as a ‘slope breaking’ of the growth rate, in terms of a merger of two non-propagating Weibel modes.

19

Tsai, Hsiang-Ming, e Chungpin Liao. "A preliminary study on air-borne lightwave amplification using Weibel-type instabilities". Optical and Quantum Electronics 48, n. 2 (13 gennaio 2016). http://dx.doi.org/10.1007/s11082-016-0388-2.

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20

Yuan, Dawei, Huigang Wei, Guiyun Liang, Feilu Wang, Yutong Li, Zhe Zhang, Baojun Zhu et al. "Laboratory study of astrophysical collisionless shock at SG-II laser facility". High Power Laser Science and Engineering 6 (2018). http://dx.doi.org/10.1017/hpl.2018.40.

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Astrophysical collisionless shocks are amazing phenomena in space and astrophysical plasmas, where supersonic flows generate electromagnetic fields through instabilities and particles can be accelerated to high energy cosmic rays. Until now, understanding these micro-processes is still a challenge despite rich astrophysical observation data have been obtained. Laboratory astrophysics, a new route to study the astrophysics, allows us to investigate them at similar extreme physical conditions in laboratory. Here we will review the recent progress of the collisionless shock experiments performed at SG-II laser facility in China. The evolution of the electrostatic shocks and Weibel-type/filamentation instabilities are observed. Inspired by the configurations of the counter-streaming plasma flows, we also carry out a novel plasma collider to generate energetic neutrons relevant to the astrophysical nuclear reactions.

21

Dieckmann, Mark Eric, Lopamudra Palodhi, Conor Fegan e Marco Borghesi. "Weibel- and non-resonant Whistler wave growth in an expanding plasma in a 1D simulation geometry". Physica Scripta, 2 marzo 2024. http://dx.doi.org/10.1088/1402-4896/ad2f8a.

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Abstract Ablating a target with an ultraintense laser pulse can create a cloud of collisionless plasma. A density ramp forms, in which the plasma density decreases and the ion's mean speed increases with distance from the plasma source. Its width increases with time. Electrons lose energy in the ion's expansion direction, which gives them a temperature anisotropy. We study with one-dimensional particle-in-cell simulations the expansion of a dense plasma into a dilute one, yielding a density ramp similar to that in laser-plasma experiments and a thermal-anisotropy-driven instability. Non-propagating Weibel-type wave modes grow in the simulation with no initial magnetic field. Their magnetic field diffuses across the shock and expands upstream. Circularly polarized propagating Whistler waves grow in a second simulation, in which a magnetic field is aligned with the ion expansion direction. Both wave modes are driven by non-resonant instabilities, they have similar exponential growth rates, and they can leave the density ramp and expand into the dilute plasma. Their large magnetic amplitude should make them detectable in experimental settings.