Lower hybrid plasma heating in a magnetic-mirror field

Rapozo, C. da C.; Assis, A. S. de; Serbêto, A.; Carneiro, L. T.

doi:10.1103/physreva.45.7469

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…Furthermore, since the present research on the lower hybrid heating in magnetic mirror devices was done a long time ago, in the relatively modest mirror devices LISA [15,16] and the Wisconsin canted-mirror [17], specific problems remain unclear in modern mirror devices where the plasma and source parameters are much more substantial. For example, as the increment of plasma temperature and source power, the nonlinear stochastic heating mechanism might be dominated.…”

Section: Introductionmentioning

confidence: 99%

Structure-preserving particle-in-cell simulation of lower hybrid wave propagation and heating in the magnetic mirror

et al. 2021

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This study presents the first-principle, structure-preserving electromagnetic particle-in-cell simulation of the lower hybrid wave (LHW) in magnetic mirror-confined plasmas. The behavior of LHW propagation and ion heating is studied and compared with the ray-tracing results. Two full-wave effects of LHW propagation in the mirror devices, the rotation of LHW and tunnel effects near the resonance, are revealed and discussed. Meanwhile, the ion heating near the resonance layer is presented. We first provide the spatial profile of energy deposition in 3D space and conduct a long-term simulation that shows an up to 150% ion temperature increment and a maximal ion temperature of over 1.5 keV in the hot spot at the end. In addition, we further discuss the heating mechanism and elucidate the stochastic ion heating behavior in such a regime. The onset and advantages of such a heating mechanism in terms of the magnetic mirror are also discussed. The results proved the reliability and effectiveness of lower hybrid stochastic heating in mirror devices.

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Section: Introductionmentioning

confidence: 99%

Structure-preserving particle-in-cell simulation of lower hybrid wave propagation and heating in the magnetic mirror

et al. 2021

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“…Within the broad range of available wave frequencies, waves in the lower hybrid range of frequency, i.e. lower hybrid waves (LHWs), have extensive applications in many devices [4][5][6][7][8]. They involve helicon wave, lower hybrid fast and slow wave, applied for the current drive, plasma heating and plasma rotation in toroidal devices [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Particle simulations on propagation and resonance of lower hybrid wave launched by phased array antenna in linear devices

Zhu¹,

Sun²,

Xiao³

et al. 2022

Plasma Sci. Technol.

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In this paper, we performed the first-principles electromagnetic-kinetic simulations to study the phased antenna array and its interactions with deuterium plasmas within the lower hybrid range of frequency. We first give the wave accessibility and resonance results which agree well with the theoretical prediction. Besides, we further investigated the antenna power spectrum with different antenna phases in the presence of the plasma and compared it with that in the vacuum, which directly indicates wave coupling and plasma absorption. In addition, for the case with zero phasing difference, our simulation results show that, albeit the launch is away from the accessibility region, the tunnelling effect and mode conversion occurred, which enhanced the coupling and absorption. Moreover, the consistent interactions between the injected wave and the plasma concerning various antenna phase differences are shown. We present the inchoate response of the plasma in terms of the launching directions. Our results could be favourable for the engineering design of wave heating experiments with a tunable phased antenna array in linear devices like simple magnetic mirrors or tandem mirrors.

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“…From the plasma potential profile, which presents maximum and minimum as a stationary wave, we chose two points of minimum (I = lO.Ocm), so I k , I = 2410 = 0.68cm-'. Another characteristic value was given by I kl I = n/d = 0.18 cm-', where d is the LISA diameter [8]. Thus, 0.18 < k , < 0.68cm-'.…”

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confidence: 99%

Lower hybrid resonant layer excitation and mode conversion in the linear LISA machine

Rapozo

Torres-Silva

1994

Phys. Scr.

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The radio frequency absorption near the lower hybrid resonance of an inhomogeneous plasma has been studied using Langmuir and magnetic probes and also a Faraday cup. The plasma was confined in the mirror linear device LISA, excited by a 28 MHz RF source. It has been shown that the absorption rate and the resonance region in space depends on the resonant volume created by the external magnetic field. Due to the collisional damping, the quality factor of the machine is comparable to a low-Q cavity resonator.

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Lower hybrid plasma heating in a magnetic-mirror field

Cited by 3 publications

References 7 publications

Structure-preserving particle-in-cell simulation of lower hybrid wave propagation and heating in the magnetic mirror

Structure-preserving particle-in-cell simulation of lower hybrid wave propagation and heating in the magnetic mirror

Particle simulations on propagation and resonance of lower hybrid wave launched by phased array antenna in linear devices

Lower hybrid resonant layer excitation and mode conversion in the linear LISA machine

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