Ion Heating by the Current-Driven Electrostatic Ion-Cyclotron Instability.

Rynn, N.; Dakin, D. R.; Correll, D.L.; Benford, Gregory

doi:10.1103/physrevlett.33.1250

Cited by 6 publications

(7 citation statements)

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“…The effects of ion temperature anisotropy on the current‐driven electrostatic ion cyclotron (CDEIC) instability [ Drummond and Rosenbluth , 1962; Motley and D'Angelo , 1963], the electromagnetic ion cyclotron instability [ Wu and Davidson , 1972], and the inhomogeneous energy‐density driven (IEDD) instability [ Ganguli et al , 1989, Ganguli et al , 1994; Gavrishchaka et al , 1996; Koepke et al , 1994; Amatucci et al , 1996] have been investigated theoretically by Lee [1972] and Okuda and Ashour‐Abdalla [1981], by Cornwall [1966] and Kennel and Petschek [1966], and by Gavrishchaka [1996], respectively. Whereas the experimental literature abounds with reports of ion cyclotron–wave effects on ion temperature anisotropy [ Rynn et al , 1974; Correll et al , 1977; Dakin et al , 1976; Stern et al , 1976, 1981; Hatakeyama et al , 1977; Koslover and McWilliams , 1987; Zintl et al , 1995], there are few experimental reports of anisotropy effects on ion cyclotron–wave growth and propagation [ Böhmer , 1976].…”

Section: Introductionmentioning

confidence: 99%

On the role of ion temperature anisotropy in the growth and propagation of shear‐modified ion‐acoustic waves

2003

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[1] Oblique ion-acoustic waves, excited by the combination of magnetic field-aligned (parallel) electron drift and sheared parallel ion flow, are investigated in magnetized laboratory plasma that is characterized by ion temperature anisotropy. Direct measurements of the parallel and perpendicular ion temperatures, parallel and perpendicular ion drift velocities, electron temperature and parallel electron drift velocity, parallel and perpendicular wave vector components, and mode frequency and growth rate are used to elucidate the shear-modified ion-acoustic (SMIA) instability mechanism and document an observed correlation between ion temperature anisotropy and wave propagation angle. Experimental measurements show that anisotropy significantly influences the growth rate and propagation angle of oblique ion-acoustic waves. These results support the ion-acoustic wave interpretation of broadband waves in the auroral energization region where shear and anisotropy are known to exist and may have ramifications for many space plasmas in which anisotropy exists in the electron temperature or ion temperature.

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Section: Introductionmentioning

confidence: 99%

On the role of ion temperature anisotropy in the growth and propagation of shear‐modified ion‐acoustic waves

2003

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“…The oscillation amplitude maximized inside the current channel and beyond the current channel edge fell rapidly [ Motley and D'Angelo , 1963]. Electrostatic ion‐cyclotron waves are efficient at gyroresonantly heating ions [ Rynn et al , 1974]. As shown in Figure 28, Correll et al [1977] validate the theory of ion‐perpendicular energization by these waves.…”

Section: Benefits Of Laboratory Experiments To the Understanding Of Smentioning

confidence: 77%

“… Ungstrup et al [1979] cite theory and laboratory experiments [ Rynn et al , 1974; Dakin et al , 1976] that are directly related to large heating efficiency and heating rate associated with gyroresonant wave‐particle interactions with current‐driven electrostatic ion‐cyclotron waves. Especially in the more dynamic regions of space, the collisionless, plasma distribution function is non‐Maxwellian.…”

Section: Laboratory Results Cited By Space Researchersmentioning

confidence: 99%

Interrelated laboratory and space plasma experiments

Koepke

2008

Reviews of Geophysics

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[1] Many advances in understanding space plasma phenomena have been linked to insight derived from theoretical modeling and/or laboratory experiments. Advances for which laboratory experiments played an important role are reviewed here. How the interpretation of the space plasma data was influenced by one or more laboratory experiments is described. The space physics motivation of laboratory investigations and the scaling of laboratory plasma parameters to space plasma conditions are discussed. Examples demonstrating how laboratory experiments develop physical insight, validate or invalidate theoretical models, discover unexpected behavior, establish observational signatures, and pioneer diagnostic methods for the space community are presented. The various device configurations found in space-related laboratory investigations are outlined. A primary objective of this review is to articulate the overlapping scientific issues that are addressable in space and laboratory experiments. A secondary objective is to convey the wide range of laboratory and space plasma experiments involved in this interdisciplinary alliance. Over time the degree to which the interrelated experiments can be compared has increased, thanks to improved diagnostic techniques in space and closer attention to matching dimensionless space parameters in the laboratory.

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“…Presented were measurements taken both parallel and perpendicular to the magnetic field applied in the device used, which was a low-pressure hotcathode dc discharge in argon. Previously, Rynn et al [1974] had used a single-mode argon laser to calibrate a pressure-swept Fabry-Perot interferometer in order to measure the BaII ion temperature in the presence of a current-driven electrostatic ion-cyclotron (CDEIC) wave.…”

Section: Ivc Laser Induced Fluorescence Diagnosticsmentioning

confidence: 99%

“…As mentioned before, no structure in the radial profile of ion-temperature is observed, indicating that no significant localized ion heating results of these ion-acoustic waves. Ioncyclotron waves, in contrast, induce significant localized ion heating [Rynn et al, 1974;Correll et al, 1977;Dakin et al, 1976, Stern et al, 19761981;Hatakeyama et al, 1977;Koepke et al, 1998;Amatucci et al, 1998]. Ion energization by ion-acoustic waves is not expected unless the ion drifts exceed by more than an order of magnitude the ion thermal speed [Vaivads et al, 1998].…”

Section: Smia Wavesmentioning

confidence: 99%

Laboratory investigation of electrostatic ion waves modified by parallel -ion -velocity shear

Teodorescu¹

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The objective of this work is the experimental study of the effect of parallel-ionvelocity shear on the destabilization and propagation of electrostatic ion waves. Shear in the magnetic-field-aligned (parallel) ion drift velocity of a single-drifting Maxwellian ion velocity distribution is created in the cylindrical barium plasma column produced in a Q machine. Standard, emissive, and single-sided Langmuir probes are used to measure plasma parameters and their fluctuations. Direct, noninvasive, measurements of the ion velocity distribution (yielding ion drift velocity and ion temperature) are performed using the laser-induced fluorescence technique. The use of laser-induced fluorescence to determine the radial profile of parallel ion drift velocity permits the measurement of the ion parallel-velocity shear without the weighting by the ion density contributions that are inherent in particle-fluxaveraged measurements. Using an almost isotropic-temperature plasma, multi-harmonic ioncyclotron waves are identified, characterized, and compared with theoretical predictions. Experimental evidence is presented that ion cyclotron damping can become inverted to result in net growth for sufficiently small values of the wavevector components ratio, k // /k ⊥ , in the presence of shear in the parallel ion flow. Cases where, for larger values of k // /k ⊥ , the damping reduces without changing sign are presented. For other experimental conditions, lowfrequency ion acoustic waves are identified, characterized and compared with theory. Their growth and propagation are measured in anisotropic plasma. Evidence is presented that shear in the parallel ion flow increases the wave frequency, that this increase is responsible for reducing ion Landau damping, and that increasing ion-temperature anisotropy both increases the growth rate and decreases the preferred propagation angle of these ion-acoustic waves. These experimental results serve to benchmark a theoretical model that predicts both shearmodified ion cyclotron and shear-modified ion acoustic waves. In the experiments reported here, the value of parallel-ion-velocity shear ranges from-0.65 ω ci to 0.24 ω ci , the value of ion-temperature anisotropy ranges from 1.2 to 2.5, the electron-to-ion (parallel) temperature ratio ranges from 1.4 to 2.9, the perpendicular wavevector component k ⊥ ρ i ranges from 0.03 to 1.25, the parallel wavevector component k || ρ i ranges from 6x10-3 to 2x10-1 and the growth rate ranges from 2.2x10-3 ω ci to 3.9x10-3 ω ci. The results of this work provide experimental support for the inhomogeneous-parallel-ion-flow-model interpretation of multi-harmonic electrostatic ion-cyclotron waves and ion-acoustic waves observed in the auroral region. The results also broaden fundamental plasma physics concepts such as ion-cyclotron damping to include the possibility of inverse ion-cyclotron damping. It is my pleasure to acknowledge the constant and fruitful support I received during my research activity from Prof. Mark Koepke. I am indebted to him for all aspects...

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Ion Heating by the Current-Driven Electrostatic Ion-Cyclotron Instability.

Cited by 6 publications

References 0 publications

On the role of ion temperature anisotropy in the growth and propagation of shear‐modified ion‐acoustic waves

On the role of ion temperature anisotropy in the growth and propagation of shear‐modified ion‐acoustic waves

Interrelated laboratory and space plasma experiments

Laboratory investigation of electrostatic ion waves modified by parallel -ion -velocity shear

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