The effect of density gradient on the growth rate of relativistic Weibel instability

Mahdavi, Mohammad; Azadboni, F. Khodadadi

doi:10.1063/1.4865829

Cited by 9 publications

(6 citation statements)

References 15 publications

(15 reference statements)

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“…Without considering degeneracy in relativistic plasma, as discussed in Ref. 16, near fuel corona, the Weibel instability growth rate increases. Then, near the fuel core, the Weibel instability growth rate decreases.…”

Section: Resultsmentioning

confidence: 95%

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The density gradient effect on quantum Weibel instability

Mahdavi

Azadboni

2015

Physics of Plasmas

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The Weibel instability plays an important role in stopping the hot electrons and energy deposition mechanism in the fast ignition of inertial fusion process. In this paper, the effects of the density gradient and degeneracy on Weibel instability growth rate are investigated. Calculations show that decreasing the density degenerate in the plasma corona, near the relativistic electron beam emitting region by 8.5% leads to a 92% reduction in the degeneracy parameter and about 90% reduction in Weibel instability growth rate. Also, decreasing the degenerate density near the fuel core by 8.5% leads to 1% reduction in the degeneracy parameter and about 8.5% reduction in Weibel instability growth rate. The Weibel instability growth rate shrinks to zero and the deposition condition of relativistic electron beam energy can be shifted to the fuel core for a suitable ignition by increasing the degeneracy parameter in the first layer of plasma corona. V C 2015 AIP Publishing LLC.

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Section: Resultsmentioning

confidence: 95%

“…The pellet core is denser than its side by four orders of magnitude so that the beam makes its way through an important density gradient. [15][16][17][18][19][20][21][22] The purpose of the present work is to investigate the influence of the density gradient of fuel dense and plasma degeneracy quantum effects on Weibel instability.…”

Section: Introductionmentioning

confidence: 99%

The density gradient effect on quantum Weibel instability

Mahdavi

Azadboni

2015

Physics of Plasmas

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“…The equilibrium between a fast electron beam and the return currents is unstable for the electromagnetic instabilities which will produce strong electromagnetic perturbation and filaments of a fast electron beam. [22][23][24][25] The electron beam is supposed to travel from the side of the fusion pellet to its core through plasma which is highly unstable.…”

Section: Introductionmentioning

confidence: 99%

The anisotropic plasma wave in the plasma turbulence

Azadboni

2022

Contributions to Plasma Physics

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In this paper, the influence of plasma turbulence due to the sheared and body stress flow on the dispersion characteristics of the transverse electromagnetic modes in strongly coupled plasma is analysed. Using kinetic theory and solving the scattering relationship for the Vlasov‐Maxwell system, the influence of plasma turbulence on the growth of the electromagnetic mode is investigated. The minimum value of the stress rate threshold for the growth rate of electromagnetic instability in the linear polarization is higher than that of circular polarization. It is shown that the instability growth rate maximum for the circular polarization is about 100 times higher than that of the linear polarization. In the circular polarization, the value minimum of the shear stress is 1.2 times the minimum volume of the body stress. For the linear polarization, the value minimum of the body stress is 1.5 times the minimum volume of the shear stress. Increasing the density gradient of plasma leads to a higher stress threshold rate, and the range of propagation angles of growing modes is limited. With increasing steps of the density gradient plasma in the low‐density corona, electromagnetic instability occurs at a higher stress flow.

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“…Excitation and presence of electromagnetic instabilities resulting from the anisotropy in the velocity space (Weibel‐like) can be introduced as one of the important mechanisms for generating these fields, and these have recently drawn attention for their role in generating magnetic fields in γ ‐ray burst and dark energy . This subject has always been interesting for researchers . Studies on electromagnetic instabilities show that the presence of quantum effects tends to weaken or suppress the instability compared to classic cases, where, in the astrophysical plasmas, the high densities tend to enhance quantum effects.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the particle spin properties on the velocity space instability in high‐density plasmas

Khanzadeh

Mahdavi

2017

Contrib. Plasma Phys

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The nonresonant electromagnetic instabilities of the anisotropic velocity space (Weibel-like) have always been one of the interesting subjects for researchers. These electromagnetic instabilities play an important role in generating strong magnetic fields in laboratory plasmas for applications such as inertial confinement fusion and space plasmas. In this paper, we investigate the quantum effects of the particle spin on the electromagnetic instabilities. In the case of the presence of a magnetic dipole force and an electron precession frequency like the Vlasov equation, we derive the full quantum equation. This study shows that, in the presence of the spin-polarized effects, the growth rate of the instabilities is reduced compared to the classical cases and will not arise for low fractions of the temperature anisotropy for different values of the magnetic field. Indeed, it is expected that the probability of electron capture in the background magnetic fields and the effective collision with the particle increase because of the spin effect, so that a high portion of the electron energy is transmitted to the background plasma, and the temperature anisotropy governing the electron distribution is reduced. KEYWORDS electron precession frequency, magnetic dipole force, nonresonant instability, temperature anisotropy INTRODUCTIONQuantum plasma physics has many applications, for example, in the fields of high-intensity laser-plasma interaction, [1,2] metal and semiconductor nanostructures, [3,4] and astrophysical plasmas. [5,6] The electron density in semiconductors is much smaller than that in metals but the de Broglie wavelength of the charge carriers is comparable to the spatial scale of the profile. Therefore, the quantum effects associated with quantum tunneling particle dispersive effects (delocalized wave functions) can become important. As is known, the spin motions of quantum systems and the magnetization related to the intrinsic spin can be important in semiconductors, in metal alloys, and, more generally, in magnetic nanostructures. [7][8][9][10] For example, it is known that magnetic moment motion allows the magnetoresistive read-heads to respond to the bits of hard disks for memory. In the field of laser plasmas, in particular inertial confinement fusion (ICF) plasmas, the spin-polarized fuel idea was proposed initially by More. [11] Investigations have shown that the thermonuclear cross-section can increase by 50% by using spin-polarized D-T fuel. Consequently, the ignition thresholds can be reduced and the fraction of the fuel burned can be increased before target disassembly. Also, the driver energy required can be reduced by the spin-polarized fuel. In addition, the use of spin-polarized fuel can lead to an anisotropic emission of -particles in the fusion reaction product. This anisotropy spatially concentrates the plasma self-heating and leads to the development of fuel ignition. [12][13][14] In ICF, a large portion of the driver energy must be converted to fusion energy of the nuclear fuel for reachin...

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The effect of density gradient on the growth rate of relativistic Weibel instability

Cited by 9 publications

References 15 publications

The density gradient effect on quantum Weibel instability

The density gradient effect on quantum Weibel instability

The anisotropic plasma wave in the plasma turbulence

Investigation of the particle spin properties on the velocity space instability in high‐density plasmas

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