Axial propagation of helicon waves

Light, Max; Sudit, Isaac D.; Chen, Francis F.; Arnush, Donald

doi:10.1063/1.871032

Cited by 81 publications

(109 citation statements)

References 13 publications

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“…Figure 5 shows the wave amplitude versus z. The characteristic beating [23] of various radial modes with different k is seen, and the major peaks are in approximate agreement for all cases. The phase of the dominant spectral component versus z was measured 2 , and from this the local wavelength λ was derived and is shown in figure 6.…”

Section: Apparatusmentioning

confidence: 75%

Superiority of half-wavelength helicon antennae

Porte

Yun

Arnush³

et al. 2003

Plasma Sources Sci. Technol.

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Section: Apparatusmentioning

confidence: 75%

Superiority of half-wavelength helicon antennae

Porte

Yun

Arnush³

et al. 2003

Plasma Sources Sci. Technol.

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“…The axial variation of the B z component of the wave field was measured [10] with a balanced, 5-turn magnetic probe with its long, shielded leads terminating in a balun transformer. Figure 9 shows the axial variation of the magnitude of B z with the R-antenna; a 'standing wave' pattern is clearly seen.…”

Section: Behaviour Of the Helicon Wavesmentioning

confidence: 99%

“…Axial scans were made with different types of thin-shafted probes which could be moved inside the discharge chamber without interfering with the discharge. Details of the apparatus can be found in previous papers [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Downstream physics of the helicon discharge

Chen¹,

Sudit²,

Light³

1996

Plasma Sources Sci. Technol.

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Abstract. Measurements of the radial and axial profiles of both the plasma parameters and the wave properties in a long, thin helicon discharge show that most of the RF power is deposited near the antenna and that a dense, cool (T e < 2 eV) plasma can be obtained in the downstream region. The density n and electron temperature T e profiles in that region can be explained quantitatively with classical collisional theory, and factor-of-two agreement can be obtained on total particle and energy balance. Spatial modulation of the helicon wave amplitude can be explained by the beating of two different radial modes launched simultaneously by the antenna. Though the helicon wave can be shown to be essential to the production of high densities, it plays little role in the downstream evolution of the plasma. These results indicate that helicon discharges can produce the cool plasmas normally associated with afterglows without the attendant loss of density.

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“…Circuits balanced in this manner have been shown to offer excellent common-mode signal rejection. 3 Integration errors dominate this measurement and grow with time, resulting in an overall error at the end of a pulse that is ∼±5% of the maximum measured value.…”

Section: Vig Antennamentioning

confidence: 99%

Operational Characteristics of a Low-Energy FARAD Thruster

Polzin

Rose

Miller

2008

44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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Data from a 100 J per pulse electrodeless accelerator employing pulsed RF-preionization are presented to gain insight into the accelerator's operating characteristics. The data suggest that the propellant distribution is highly unoptimized, with most of the gas inaccessible to the discharge and the remainder mostly concentrated at the inner radius of the coil. The pulsed RF-preionization discharge produces a visible plasma, but like the gas distribution it mostly appears concentrated at the inner radius of the thruster. Magnetic field probes in the discharge point to a current sheet that is not magnetically impermeable. These data also exhibit signs of nonrepeatability, and time-integrated discharge photography shows signs of spatial nonuniformity in both the radial and azimuthal directions. Terminal voltage measurements on the two capacitor banks of the thruster do not exhibit the asymmetric nature (in time) typically associated with an efficient pulsed plasma accelerator. Based on the experimental evidence, the poor performance of the thruster is thought to be due to insufficient preionization, which at these low discharge energy levels severely limits the ability of the main current pulse to couple with and effectively accelerate the propellant.

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Axial propagation of helicon waves

Cited by 81 publications

References 13 publications

Superiority of half-wavelength helicon antennae

Superiority of half-wavelength helicon antennae

Downstream physics of the helicon discharge

Operational Characteristics of a Low-Energy FARAD Thruster

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