Radial density profile change near lower hybrid frequency in M = 0 helicon wave plasmas

Yun, Seok‐Min; Chang, Hong‐Young

doi:10.1016/s0375-9601(98)00677-x

Cited by 16 publications

(13 citation statements)

References 18 publications

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“…Similar B 0 dependence of radial profiles of n p is reported in Ar. 16 Figure 12͑a͒ shows the axial profiles of the imaginary part of B z , which is normalized by I rf (Im B z /I rf ), 18 measured in He. It is clear that the axial wavelength ( z ) is FIG.…”

Section: Resultsmentioning

confidence: 99%

“…1,11,12 In the experiments, effective ionization by helicon waves at the vicinity of the LH resonance was reported. [13][14][15][16] It is, therefore, necessary to consider ion contributions in order to fully understand the physical mechanisms needed to create high-density plasmas using helicon waves. Furthermore, most of the previous helicon wave experiments were performed using inert gases 13,15,16 such as Ar, He, Ne, and Xe gases.…”

Section: Introductionmentioning

confidence: 99%

“…[13][14][15][16] It is, therefore, necessary to consider ion contributions in order to fully understand the physical mechanisms needed to create high-density plasmas using helicon waves. Furthermore, most of the previous helicon wave experiments were performed using inert gases 13,15,16 such as Ar, He, Ne, and Xe gases. Very few experimental investigations were conducted to find an optimum B 0 in helicon wave discharges using molecular gases such as H 2 and N 2 .…”

Section: Introductionmentioning

confidence: 99%

“…Very few experimental investigations were conducted to find an optimum B 0 in helicon wave discharges using molecular gases such as H 2 and N 2 . 14 In this article, we investigate the contribution of the SW on high-density plasma production by mϭ0 helicon waves 14,[16][17][18][19][20] using several gases such as H 2 , D 2 , He, N 2 , Ne, Ar, and Xe.…”

Section: Introductionmentioning

confidence: 99%

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Contribution of slow waves on production of high-density plasmas by m=0 helicon waves

1999

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Towards a better comprehension of plasma formation and heating in high performances electron cyclotron resonance ion sources (invited) Rev. Sci. Instrum. 83, 02A336 (2012) Commissioning of heating neutral beams for COMPASS-D tokamak Rev. Sci. Instrum. 83, 02B114 (2012) Development of a versatile multiaperture negative ion source Rev. Sci. Instrum. 83, 02A707 (2012) Plasma dynamics in microsecond megaampere plasma opening switchesThe contribution of the slow waves ͑SWs͒ on high-density plasma production by mϭ0 helicon waves is investigated in H 2 , D 2 , He, N 2 , Ne, Ar, and Xe plasmas. The density-jump is observed in all the gases used at optimum external magnetic fields B 0 . The measured plasma density n p as a function of B 0 peaks at a condition close to the lower-hybrid resonance in H 2 , D 2 , He, N 2 , and Ne, whereas, the measured dispersion relation indicates the excitation of helicon wave. Dispersion relation of electromagnetic waves is solved using dielectric tensor elements of a cold uniform plasma including ion terms, which shows two branches: the SW and fast ͑helicon͒ wave. The transition from the ionization by SWs, which are excited in the low-density plasma produced by an antenna induction field, to that by helicon waves has been predicted to explain the mechanism to produce the high-density plasma in the helicon wave discharges.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Contribution of slow waves on production of high-density plasmas by m=0 helicon waves

1999

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“…When realistic collision frequencies are included in the calculations, equations (6)- (8), the resonance in the perpendicular wave number at the lower hybrid frequency for the slow wave becomes finite and the maximum value of both the real and imaginary parts is reduced (figure 3(a)). Not only is the maximum value of the perpendicular wave number reduced, the resonance frequency shifts to smaller magnetic field strengths and the width of the lower hybrid resonance increases [26]. The frequency shift due to collisions is easier to see if the denominators in equations (6)-(8) are converted to real values.…”

Section: Effects Of Plasma Densitymentioning

confidence: 99%

Slow wave ion heating in the HELIX helicon source

Kline

Scime

Boivin

et al. 2002

Plasma Sources Sci. Technol.

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Ion temperature measurements have been made at multiple axial and radial locations in a helicon source for a range of magnetic field strengths and RF frequencies. The observed temperature gradient along the axis suggests limited thermal transport along the magnetic field. The radial profiles are flat near the axis and in some cases peak near the edge of the plasma. The ion temperature measurements combined with calculations of the perpendicular wave numbers for the slow wave or 'Trivelpiece-Gould' mode are consistent with ion heating due to ion Landau damping of the slow wave at the edge of the plasma.

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Basic Helicon Wave Plasma

Shinohara

2022

Springer Series in Plasma Science and Technology

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Radial density profile change near lower hybrid frequency in M = 0 helicon wave plasmas

Cited by 16 publications

References 18 publications

Contribution of slow waves on production of high-density plasmas by m=0 helicon waves

Contribution of slow waves on production of high-density plasmas by m=0 helicon waves

Slow wave ion heating in the HELIX helicon source

Basic Helicon Wave Plasma

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