Plasma Production by Helicon and Slow Waves

Sakawa, Y.; Kunimatsu, Hiroyuki; Kikuchi, H.; Fukui, Yasuaki; Shoji, T.

doi:10.1103/physrevlett.90.105001

Cited by 20 publications

(15 citation statements)

References 19 publications

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“…It should be mentioned that the boundary conditions in laboratory plasmas result in the finite parallel and perpendicular wavenumbers and the dispersion relation is modified. Studies on the helicon wave have shown the high-density plasma production in the density range of 10 12 -10 13 cm −3 under a low gas pressure (typically a few mTorr) Degeling et al 1996;Chen and Hershkowitz 1998;Franck et al 2003;Sakawa et al 2003;Shinohara et al 2010). Since the helicon wave has no strict resonance condition as seen in Fig.…”

Section: Radiofrequency Magnetic Nozzle Plasma Thrustersmentioning

confidence: 99%

Helicon-type radiofrequency plasma thrusters and magnetic plasma nozzles

Takahashi

2019

Rev. Mod. Plasma Phys.

181

111

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Development of electrodeless radiofrequency plasma thrusters, e.g., a helicon thruster, has been one the of challenging topics for future high-power and longlived electric propulsion systems. The concept simply has a radiofrequency plasma production/heating source and a magnetic nozzle, while it seems to include many aspects of physics and engineering issues. The plasma produced inside the source is transported along the magnetic field lines and expands in the magnetic nozzle, where the plasma is spontaneously accelerated into the axial direction along the magnetic nozzle, yielding a generation of the thrust force. Hence, the plasma transport and spontaneous acceleration phenomena in the magnetic nozzle are key issues to improve the performance of the thrusters. Since the thrust is equal in magnitude and opposite in direction to momentum flux exhausted from the system, the direct measurement of the thrust can reveal not only the thruster performance but also fundamental physical quantity of plasma momentum flux. Here studies on fundamental physics relating to the thruster development and the technology for the compact and efficient system are reviewed; the current status of the thruster performance is shown. Finally, a recently proposed future new application of the thruster is also discussed.

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Section: Radiofrequency Magnetic Nozzle Plasma Thrustersmentioning

confidence: 99%

Helicon-type radiofrequency plasma thrusters and magnetic plasma nozzles

Takahashi

2019

Rev. Mod. Plasma Phys.

181

111

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“…Various HW studies have been executed in a large-volume helicon source HE-L [35] [37], and a tube of D = 4 cm and L = 130-160 cm [93] for various helicon studies. The Shoji and Sakawa group studied many basic HW studies using a Pyrex source with D ~ 5 cm and L = 60-90 cm, connected to a stainless steel chamber with D = 150 cm and L = 36.5 cm [94,95].…”

Section: Various Hp Sources With Different Sizes and Machine Geometriesmentioning

confidence: 99%

Helicon high-density plasma sources: physics and applications

Shinohara

2018

Advances in Physics: X

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Helicon high-density (up to ~10 13 cm −3) plasma sources using a radio frequency wave in the presence of a magnetic field under a low pressure are very promising for various application fields owing to the flexibility of external operational parameters. In addition, these sources have interesting inherent characteristics. Herein, the basic features of helicon wave plasmas including production mechanisms are briefly described, focusing on some similarities to other fields. Examples of specific helicon sources are also introduced. Then, an extensive variety of applications ranging from fundamental to practical applications, which are very influential for further development in each field, are introduced, emphasizing crucial points.

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“…When the finite magnetic field is applied, the ICP mode is precluded, which could be a low-density TG wave-sustained mode. Indeed, the low-density plasmas sustained by the TG waves are observed in a low magnetic field [92] and at a very high drive frequency range [107]. The induction fields observed at a low density in the experiments [47,48,57,59] are evanescent helicon waves, which oscillate near the antenna (within their skin depth).…”

Section: Discussionmentioning

confidence: 83%

“…The observed wave fields at the first harmonic (drive frequency is f = 13.56 MHz) are identified as TG waves (pseudosurface waves) at a low-density (n ∼ 9.0 × 10 10 cm −3 ) and high B field (ω ce /ω > 2.5 ∼ B 0 = 12 G), while waves at the second harmonic (drive frequency is f = 27.12 MHz) behave as helicon waves at a low B field (ω ce /ω < 2.5 ∼ B 0 = 24 G). By using high-frequency f = 50 MHz and very-high-frequency f = 144 MHz, Sakawa et al [107] also observed low-density (∼ 10 10 cm −3 ) discharge being sustained by the TG wave.…”

Section: Mode Jumps In Helicon Dischargementioning

confidence: 98%

“…Therefore, which wave is responsible for RF absorption should be investigated. Indeed, the low-density plasmas sustained by the TG waves are observed in a low magnetic field [92] and very high drive frequency range [107], where the wavelength of the TG wave becomes comparable to the plasma radius. The difference between the ICP mode and the helicon mode should be investigated in more detail from the perspective of the power balance.…”

Section: Remaining Critical Issuesmentioning

confidence: 99%

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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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Plasma Production by Helicon and Slow Waves

Cited by 20 publications

References 19 publications

Helicon-type radiofrequency plasma thrusters and magnetic plasma nozzles

Helicon-type radiofrequency plasma thrusters and magnetic plasma nozzles

Helicon high-density plasma sources: physics and applications

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

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