Electromagnetic Waves and Instabilities in Magnetoplasmas: Ion and Electron Dynamics of Whistler, Alfvén and Drift Waves

Grulke, O.; Franck, Christian M.; Klinger, T.; Schröder, C.; Stark, A.; Windisch, T.; Zalach, J.

doi:10.1002/ctpp.200510044

Cited by 7 publications

(7 citation statements)

References 42 publications

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“…The experiments were done in the linear magnetized plasma of the helicon device VINETA [16]. It consists of a 4.5 m long cylindrical chamber with a diameter of 0.4 m. A linear homogeneous magnetic field of B 0 ≤ 100 mT is generated by a set of 36 magnetic field coils.…”

Section: A the Experimental Devicementioning

confidence: 99%

Nonlinear interaction of drift waves with driven plasma currents

2010

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In a cylindrical magnetized plasma, coherent drift wave modes are synchronized by a mode selective drive of plasma currents. Nonlinear effects of the synchronization are investigated in detail. Frequency pulling is observed over a certain frequency range. The dependence of the width of this synchronization range on the amplitude of the driven plasma currents forms Arnold tongues. The transition between complete and incomplete synchronization is indicated by the onset of periodic pulling and phase slippage. Synchronization is observed for driven current amplitudes, that are some percent of the typical value of parallel currents generated by drift waves.

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Section: A the Experimental Devicementioning

confidence: 99%

Nonlinear interaction of drift waves with driven plasma currents

2010

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“…In the linear Versatile Instrument for studies on Nonlinearity, Electromagnetism, Turbulence, and Applications (VINETA) [191], Grulke et al [20,[192][193][194][195][196] identified the resistive drift-wave instability by comparing the drift mode density fluctuation characteristics with a linear model proposed by Ellis et al [75], which reproduced the experimentally observed bent eigenmode structures due to the radial gradients of the collisionality (electron-ion collision frequency) profile. Figure 18 [20] compares the azimuthal mode structure of an m = 5 drift mode as obtained from the linear dispersion relation calculation with the experimental measurement.…”

Section: Instabilities In Helicon Dischargementioning

confidence: 99%

“…Chen et al [6,152,168] insist that the shortcircuit effect plays a crucial role in the centrally peaked density profile. On the other hand, the drift-wave turbulences observed in the helicon source [19][20][21][192][193][194][195][196] can also be a candidate for anomalous diffusion. There is no consensus on which plays a dominant role in plasma transport across the magnetic field.…”

Section: Remaining Critical Issuesmentioning

confidence: 99%

Review of Helicon High-Density Plasma: Production Mechanism and Plasma/Wave Characteristics

Isayama

Shinohara

Hada

2018

Plasma and Fusion Research

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Helicon plasma is one of the radio frequency plasma source that can generate high-density and lowtemperature plasmas by utilizing the helicon wave, i.e., the electromagnetic whistler wave in a bounded geometry. Helicon plasma is very useful for various applications due to its extremely efficient production of high-density plasma. Conversely, many unsolved physical issues remain regarding how an efficient production of the helicon plasma is realized in laboratories and what determines the density maximum. The past decades of the helicon studies have revealed that the "Trivelpiece-Gould" wave is responsible for the efficient power absorption. In recent years, the drift-wave type and the parametric-decay instabilities have been extensively studied, by using the linear magnetized helicon plasma sources. The present helicon study considers these non-linear effects. Consequently, it includes many interests for both industry and research fields. The mechanism of the helicon production is discussed, based on the several critical physical issues. In addition, some recent topics and the efforts to build a more refined physical model of the helicon plasma are highlighted.

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“…The experiments were conducted in the linear, magnetized, low-β plasma device VINETA [20]. The vacuum chamber, schematically depicted in Fig.…”

Section: Drift Waves In the Experimental Device Vinetamentioning

confidence: 99%

Comparison of electrostatic and electromagnetic synchronization of drift waves and suppression of drift wave turbulence in a linear device

Brandt

Grulke

Klinger

2010

Plasma Phys. Control. Fusion

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Abstract. Experiments in a cylindrical magnetized plasma on the control of drift waves by means of two different spatiotemporal open-loop control systems -an electrostatic and an electromagnetic exciter -are reported. The drift wave dynamics is controlled by a mode-selective signal created with azimuthal arrangements of eight electrodes and eight saddle coils, respectively. Nonlinear interaction between the control signals and drift waves is observed, leading to synchronization of coherent drift waves and suppression of broadband drift wave turbulence. The cross-phase between density and potential fluctuations reduces from ≈ π/2 in turbulence to ≈ 0 in controlled turbulence. Hence, the cross-field transport is reduced to the level of coherent drift waves. For both control systems the coupling to the drift wave can be ascribed to the drive of parallel currents, on the one hand via direct electric contact and on the other hand via electromagnetic induction.

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Electromagnetic Waves and Instabilities in Magnetoplasmas: Ion and Electron Dynamics of Whistler, Alfvén and Drift Waves

Cited by 7 publications

References 42 publications

Nonlinear interaction of drift waves with driven plasma currents

Nonlinear interaction of drift waves with driven plasma currents

Review of Helicon High-Density Plasma: Production Mechanism and Plasma/Wave Characteristics

Comparison of electrostatic and electromagnetic synchronization of drift waves and suppression of drift wave turbulence in a linear device

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