The density gradient effect on quantum Weibel instability

Mahdavi, Mohammad; Azadboni, F. Khodadadi

doi:10.1063/1.4914840

Cited by 6 publications

(1 citation statement)

References 22 publications

(20 reference statements)

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“…When an ultrahigh intensity short-pulse (∼10 ps) laser interacts with the fusion fuel, the relativistic electron beams are produced at the critical density surface of the fuel plasma by the ponderomotive force associated with the intense electromagnetic fields of the laser and pushed out of the focal spot. [13,14] The relativistic electron beam then deposits most of their energy in a reasonably short-flat density region. The body stress and viscosity affect convective flow in heat losses that lead to increasing anisotropic temperatures.…”

Section: Introductionmentioning

confidence: 99%

The study of the weibel electromagnetic instability growth rate in the presence of the body stress

Amininasab

Sadighi‐Bonabi

Azadboni

2018

Contributions to Plasma Physics

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Body stress flow can be expected in the fast ignition imploding of the inertial fusion process that strongly damps small-scale velocity structures. The Weibel instability is one of the plasma instabilities that require anisotropy in the distribution function. The body stress effect was neglected in the calculation of the Weibel instability growth rate. In this article, the propagation condition of impinging waves and the growing modes of the Weibel instability on the plasma density gradient of the fuel fusion with the body stress flow are investigated. Calculations show that the minimum value of the body stress rate threshold in the linear polarization is about 2.96 times greater than that of the circular polarization. Increasing 10 times of the density gradient and decreasing 2 times of the wavelength in the linear polarization and the circular polarization, respectively, lead to about 1.78 × 10 6 times increment and 0.019 times decrement in the maximum of the Weibel instability growth rate. Also, the Weibel instability growth rate maximum in the circular polarization is about 10 7 times greater than that of the linear polarization. The body stress flow and the density gradient tend to stabilize the Weibel instability in the circular polarization and act as a destabilizing source in the linear polarization. Therefore, by increasing steps of the density gradient plasma near the relativistic electron beam-emitting region, in the circular polarization, the Weibel instability occurs at a higher stress flow. KEYWORDSbody stress, density gradient, weibel instability INTRODUCTIONFor the inertial confinement fusion, experiments seek to compress a capsule (1.11 mm radius), consisting of deuterium-tritium fuel and an outer plastic (CH) ablator, to sufficient temperatures and densities that a self-sustaining thermonuclear burn is achieved. The flow of the target plasma is induced, which causes the implosion of the target plasma up to high density and temperature. [1][2][3] The fast ignition scenario is a very promising approach to inertial fusion, because it can significantly reduce the required laser energy. The fast ignition is a two-step process implying two drivers. The deuterium tritium pellet is first precompressed by a laser without being ignited. The outer layers of the capsule ablate and launch a series of shocks inward. Then, ignition is performed through a petawatt laser shot on the side of the fuel pellet. Laser impact on the surface of the fuel pellet generates a few tens of mega bars of intense pressure that isentropically compresses the deuterium tritium material to a few eV and a density of the order of 1,000 times the liquid deuterium tritium density. At the time of ignition, the fuel should be assembled into the lower-density region (100 g/cm 3 ), high-temperature (>10 keV) central hot spot surrounded by higher-density region (1,000 g/cm 3 ) deuterium-tritium fuel. The electrons driven by the ponderomotive pressure form. With increasing pressure, the elements of a body are compressed. Such a compression c...

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Section: Introductionmentioning

confidence: 99%

The study of the weibel electromagnetic instability growth rate in the presence of the body stress

Amininasab

Sadighi‐Bonabi

Azadboni

2018

Contributions to Plasma Physics

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Effect of shear stress on collisional electromagnetic modes in the fast ignition

Azadboni

2022

Chinese Journal of Physics

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Generation of attosecond electron bunches by the relativistic Weibel instability

Azadboni

Sadighi‐Bonabi

2018

Physics of Plasmas

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The relativistic Weibel instability and temperature anisotropy can generate electron bunches of attosecond duration which makes it an attractive method for the generation and amplification of tunable ultrashort pulses. In this paper, the effect of the relativistic Weibel instability and temperature anisotropy on generating attosecond electron bunches is investigated. Calculations show that with the reduction relativistic parameter, γ, by a factor of 2, increasing 14.6% of the relativistic Weibel instability leads to about 62% reduction of the nanobunching gain saturation time and the density perturbation generated by the temperature anisotropy and the relativistic Weibel instability. The nanobunching density perturbation has a maximum value corresponding to 2.12 × 1037 for wavenumber kc/ωpe = 1.33 and γ = 3. Evidence of ultrashort electron bunches could be applied to attosecond electron and coherent x-ray production.

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The density gradient effect on quantum Weibel instability

Cited by 6 publications

References 22 publications

The study of the weibel electromagnetic instability growth rate in the presence of the body stress

The study of the weibel electromagnetic instability growth rate in the presence of the body stress

Effect of shear stress on collisional electromagnetic modes in the fast ignition

Generation of attosecond electron bunches by the relativistic Weibel instability

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