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Relevant bibliographies by topics / Electromagnetic ion temperature

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Journal articles

Academic literature on the topic 'Electromagnetic ion temperature'

Author: Grafiati

Published: 6 September 2023

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Journal articles on the topic "Electromagnetic ion temperature"

1

SHUKLA, NITIN, A. STOCKEM, F. FIÚZA, and L. O. SILVA. "Enhancement in the electromagnetic beam-plasma instability due to ion streaming." Journal of Plasma Physics 78, no. 2 (2011): 181–87. http://dx.doi.org/10.1017/s0022377811000559.

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AbstractWe investigate the Weibel instability in counter-propagating electron–ion plasmas with focus on the ion contribution, considering a realistic mass ratio. A generalized dispersion relation is derived from the relativistic theory by assuming an initially anisotropic temperature, which is represented by a waterbag distribution in momentum space, which shows an enhanced growth rate due to ion response. Two-dimensional particle-in-cell simulations support the theoretical analysis, showing a further amplification of magnetic field on ion time scale. The effect of an initial anisotropic temperature is investigated showing that the growth rate is monotonously decreased if the transverse spread is increased. Nevertheless, the presence of ions generates that the instability can develop for significantly higher electron temperatures. Suppression of oblique mode is also explored by introducing a parallel velocity spread.

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2

Kim, J. Y., W. Horton, and J. Q. Dong. "Electromagnetic effect on the toroidal ion temperature gradient mode." Physics of Fluids B: Plasma Physics 5, no. 11 (1993): 4030–39. http://dx.doi.org/10.1063/1.860623.

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3

Chong, T. H., M. Fukuda, T. Yorita, et al. "Development of ECR ion source with high-temperature superconducting REBCO coils." Journal of Physics: Conference Series 2244, no. 1 (2022): 012108. http://dx.doi.org/10.1088/1742-6596/2244/1/012108.

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Abstract A new High-Temperature Superconducting ECR (HTS-ECR) ion source is under development in Research Center for Nuclear Physics (RCNP), Osaka University. This ion source will be used for production of high intensity proton, deuteron and He ion beams. The HTS-ECR magnets are composed of three solenoid coils and a set of sextupole coils made of REBCO tapes, a high-temperature superconductor. The HTS-ECR ion source is designed to operate at frequency of 2.45 GHz and 10 GHz. Performance test of the HTS coils had been carried out at 31 K and 77 K. This HTS coil technology will be applied to development of a meter-size HTS coil system of a high intensity compact AVF cyclotron. This paper introduces the basic design of the HTS-ECR ion source. The performance test results showed that REBCO solenoids remain superconducting state with a current up to 400 A. Simulation results of the magnetic field and electromagnetic field distributions in a plasma chamber fulfilled the requirements of electron cyclotron resonance conditions at 2.45 GHz and 10 GHz. Simulation result of mirror ratios and electromagnetic field amplitudes are also presented in this paper.

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4

Barghouthi, I. A., N. M. Doudin, A. A. Saleh, and V. Pierrard. "High-altitude and high-latitude O<sup>+</sup> and H<sup>+</sup> outflows: the effect of finite electromagnetic turbulence wavelength." Annales Geophysicae 25, no. 10 (2007): 2195–202. http://dx.doi.org/10.5194/angeo-25-2195-2007.

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Abstract. The energization of ions, due to interaction with electromagnetic turbulence (i.e. wave-particle interactions), has an important influence on H+ and O+ ions outflows in the polar region. The effects of altitude and velocity dependent wave-particle interaction on H+ and O+ ions outflows in the auroral region were investigated by using Monte Carlo method. The Monte Carlo simulation included the effects of altitude and velocity dependent wave-particle interaction, gravity, polarization electrostatic field, and divergence of auroral geomagnetic field within the simulation tube (1.2–10 earth radii, RE). As the ions are heated due to wave-particle interactions (i.e. ion interactions with electromagnetic turbulence) and move to higher altitudes, the ion gyroradius ρi may become comparable to the electromagnetic turbulence wavelength λ⊥ and consequently (k⊥ρi) becomes larger than unity. This turns the heating rate to be negligible and the motion of the ions is described by using Liouville theorem. The main conclusions are as follows: (1) the formation of H+ and O+ conics at lower altitudes and for all values of λ⊥; (2) O+ toroids appear at 3.72 RE, 2.76 RE and 2 RE, for λ⊥=100, 10, and 1 km, respectively; however, H+ toroids appear at 6.6 RE, 4.4 RE and 3 RE, for λ⊥=100, 10, and 1 km, respectively; and H+ and O+ ion toroids did not appear for the case λ⊥ goes to infinity, i.e. when the effect of velocity dependent wave-particle interaction was not included; (3) As λ⊥ decreases, H+ and O+ ion drift velocity decreases, H+ and O+ ion density increases, H+ and O+ ion perpendicular temperature and H+ and O+ ion parallel temperature decrease; (4) Finally, including the effect of finite electromagnetic turbulence wavelength, i.e. the effect of velocity dependent diffusion coefficient and consequently, the velocity dependent wave-particle interactions produce realistic H+ and O+ ion temperatures and H+ and O+ toroids, and this is, qualitatively, consistent with the observations of H+ and O+ ions in the auroral region at high altitudes.

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5

Cremer, M., and M. Scholer. "On a nonlinear state of the electromagnetic ion/ion cyclotron instability." Nonlinear Processes in Geophysics 7, no. 3/4 (2000): 173–77. http://dx.doi.org/10.5194/npg-7-173-2000.

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Abstract. We have investigated the nonlinear properties of the electromagnetic ion/ion cyclotron instability (EMIIC) by means of hybrid simulations (macroparticle ions, massless electron fluid). The instability is driven by the relative (super-Alfvénic) streaming of two field-aligned ion beams in a low beta plasma (ion thermal pressure to magnetic field pressure) and may be of importance in the plasma sheet boundary layer. As shown in previously reported simulations the waves propagate obliquely to the magnetic field and heat the ions in the perpendicular direction as the relative beam velocity decreases. By running the simulation to large times it can be shown that the large temperature anisotropy leads to the ion cyclotron instability (IC) with parallel propagating Alfvén ion cyclotron waves. This is confirmed by numerically solving the electromagnetic dispersion relation. An application of this property to the plasma sheet boundary layer is discussed.

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6

Weiland, J., and A. Hirose. "Electromagnetic and kinetic effects on the ion temperature gradient mode." Nuclear Fusion 32, no. 1 (1992): 151–55. http://dx.doi.org/10.1088/0029-5515/32/1/i13.

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7

Peng, Shuitao, Lu Wang, and Yuan Pan. "Intrinsic parallel rotation drive by electromagnetic ion temperature gradient turbulence." Nuclear Fusion 57, no. 3 (2016): 036003. http://dx.doi.org/10.1088/1741-4326/aa4e57.

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8

Lashmore-Davies, C. N., R. O. Dendy, and K. F. Kam. "Electromagnetic ion cyclotron instability driven by a hot minority ion species with temperature anisotropy." Plasma Physics and Controlled Fusion 35, no. 11 (1993): 1529–40. http://dx.doi.org/10.1088/0741-3335/35/11/003.

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9

Lashmore-Davies, C. N., R. O. Dendy, and K. F. Kam. "Electromagnetic ion cyclotron instability driven by a hot minority ion species with temperature anisotropy." Plasma Physics and Controlled Fusion 36, no. 3 (1994): 581. http://dx.doi.org/10.1088/0741-3335/36/3/015.

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10

Kumar, Amit, Ruby Gupta, and Jyotsna Sharma. "Electromagnetic Weibel instability in spatial anisotropic electron–ion plasmas." AIP Advances 12, no. 6 (2022): 065013. http://dx.doi.org/10.1063/5.0092835.

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The Weibel instability due to temperature anisotropy of electrons and ions in a plasma in the presence of cold and warm ions is reported. Numerical calculations of the normalized growth rate are carried out when the frequency of electromagnetic waves is greater than or less than the thermal velocity of electrons for typical existing plasma parameters. The normalized growth rate increases with an increasing normalized wave number, and after attaining maxima, it decreases due to thermal effects. Therefore, a parabolic plot is obtained for the growth rate. The threshold values of the growth rate depend on the anisotropy parameters. On increasing the value of the temperature anisotropy ratio of either plasma component, the observed growth rate increases. There is a considerable and contrasting effect of the presence of cold and warm ions on the growth rate of the Weibel instability in the plasma. The addition of cold ions stabilizes the instability and reduces the maximum growth rate values, while the addition of warm ions to the plasma increases the instability with a considerable decrease in the domain of instability. Our theoretical investigations of the effect of temperature anisotropy on the growth rate of the Weibel instability are in good agreement with the existing experimental results.

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