Helicons-the past decade

Chen, F.F.; Boswell, Rod

doi:10.1109/27.650899

Cited by 306 publications

(185 citation statements)

References 79 publications

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“…In another case, as shown on the Fig. 3 of Chen and Boswell (1997), where the magnetic field profile is characterized by one node located at some distance from the tube axis, the wave field region with ion sense of polarization (close to the walls) represents around 50% of the total tube volume (case of a radiating antenna with right-hand helicity).…”

Section: Discussionmentioning

confidence: 99%

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Ion sense of polarization of the electromagnetic wave field in the electron whistler frequency band

Lundin

Krafft

2002

Ann. Geophys.

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Abstract. It is shown that the left-hand (or ion-type) sense of polarization can appear in the field interference pattern of two plane electron whistler waves. Moreover, it is demonstrated that the ion-type polarized wave electric fields can be accompanied by the presence at the same observation point of electron-type polarized wave magnetic fields. The registration of ion-type polarized fields with frequencies between the highest ion gyrofrequency and the electron gyrofrequency in a cold, overdense plasma is a sufficient indication for the existence of an interference wave pattern, which can typically occur near artificial or natural reflecting magnetospheric plasma regions, inside waveguides (as in helicon discharges, for example), in fields resonantly emitted by beams of charged particles or, in principle, in some self-sustained, nonlinear wave field structures. A comparison with the conventional spectral matrix data processing approach is also presented in order to facilitate the calculations of the analyzed polarization parameters.

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Section: Discussionmentioning

confidence: 99%

“…Actually, both types of field polarizations have been evidenced in the interference pattern of guided whistler waves, even in the case when the helicity of the radiating antenna was adjusted for the excitation of electron-type polarized waves only (Chen and Boswell, 1997).…”

Section: Introductionmentioning

confidence: 99%

Ion sense of polarization of the electromagnetic wave field in the electron whistler frequency band

Lundin

Krafft

2002

Ann. Geophys.

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“…The concept is generally known to produce rare gas discharges with very high efficiency [5,6]. Another prominent feature is the enhancement of the coupling efficiency at a few mT external magnetic field strength, the so-called low-field peak [7], which could be enough improvement regarding the application at ion sources.…”

Section: Introductionmentioning

confidence: 99%

Alternative RF coupling configurations for H− ion sources

Briefi

Gutmann

Fantz

2015

AIP Conference Proceedings

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Abstract. RF heated sources for negative hydrogen ions both for fusion and accelerators require very high RF powers in order to achieve the required H − current what poses high demands on the RF generators and the RF circuit. Therefore it is highly desirable to improve the RF efficiency of the sources. This could be achieved by applying different RF coupling concepts than the currently used inductive coupling via a helical antenna, namely Helicon coupling or coupling via a planar ICP antenna enhanced with ferrites. In order to investigate the feasibility of these concepts, two small laboratory experiments have been set up. The PlanICE experiment, where the enhanced inductive coupling is going to be investigated, is currently under assembly. At the CHARLIE experiment systematic measurements concerning Helicon coupling in hydrogen and deuterium are carried out. The investigations show that a prominent feature of Helicon discharges occurs: the so-called low-field peak. This is a local improvement of the coupling efficiency at a magnetic field strength of a few mT which results in an increased electron density and dissociation degree. The full Helicon mode has not been achieved yet due to the limited available RF power and magnetic field strength but it might be sufficient for the application of the coupling concept to ion sources to operate the discharge in the low-field-peak region.

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“…On the one hand, the use of these values ensures the clarity of the forthcoming figures. On the other hand, the chosen parameters can easily be realized if, e.g., the plasma column is created by an RF discharge under laboratory conditions (see, e.g., [15][16][17]). 2(b) and, therefore, are not given here in the interests of brevity.…”

Section: Scattering At the Surface Plasmon Resonancesmentioning

confidence: 99%

Scattering of an Obliquely Incident Plane Electromagnetic Wave by a Magnetized Plasma Column: Energy Flow Patterns at Plasmon Resonances

Es'kin¹,

Ivoninsky²,

Kudrin³

2015

PIER B

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Abstract-The scattering of an obliquely incident H-polarized plane electromagnetic wave by a magnetized plasma column is studied. It is assumed that the column is located in free space and aligned with an external static magnetic field. The emphasis is placed on the case where the angular frequency of the incident wave coincides with one of the surface-or volume-plasmon resonance frequencies of the column. The spatial structures of the field and energy flow patterns in the near zone of the column are analyzed, and the location of the regions with a greatly enhanced magnitude of the timeaveraged Poynting vector is determined. It is shown that the sign reversal of the longitudinal energy-flow component that is parallel to the column axis can occur when passing across the boundary between the inner region of the column and the surrounding medium.

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Helicons-the past decade

Cited by 306 publications

References 79 publications

Ion sense of polarization of the electromagnetic wave field in the electron whistler frequency band

Ion sense of polarization of the electromagnetic wave field in the electron whistler frequency band

Alternative RF coupling configurations for H− ion sources

Scattering of an Obliquely Incident Plane Electromagnetic Wave by a Magnetized Plasma Column: Energy Flow Patterns at Plasmon Resonances

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