RF stabilization of high-density plasma in an axisymmetric mirror II: empirical scaling

Yasaka, Y.; Itatani, Ryohei

doi:10.1088/0029-5515/25/1/003

Cited by 17 publications

(2 citation statements)

References 4 publications

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“…Several other experiments [6] as well as recent results in Phaedrus [7] suggest that central-cell stability can also be provided by the radial ponderomotive force associated with the central-cell ICRF. As a result, the plug beta is no longer needed for centralcell stability, and central-cell ion confinement can be obtained by having high-density plugs that are composed of relatively cold ions.…”

Section: Gas-puffing Experiments With An Icrf-stabilized Central Cellmentioning

confidence: 86%

“…Several recent experiments [6,7] have suggested that an RF-sustained central-cell plasma can be stabilized by radial ponderomotive force provided by central-cell RF and that the requirement of high plug beta need not apply. McBride [8] has also suggested that central-cell ICRF can stabilize interchange modes without invoking ponderomotive force.…”

Section: Introductionmentioning

confidence: 99%

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Gas fuelling of Rf-sustained tandem mirror end plugs

et al. 1984

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The possibility of fuelling pure RF-powered tandem mirror end plugs by gas puffing is considered. It is shown experimentally that gas puffing can lead to significant increases in plug density and that the details of the plug density buildup depended on the antenna locations relative to the central cell and the plug midplane. Large charge-exchange energy loss resulting from the puff gas makes it an inefficient technique for fuelling high-temperature end plugs. The possibility of employing gas puffing for building up high-density end plugs composed of relatively cold ions is also considered as a means of achieving electrostatic confinement for an ICRF-stabilized central cell. Experimental enhancement of the central-cell density, which shows no significant cooling of the central cell by the colder plug plasmas, is demonstrated. The RF power requirements for refuelling an ICRF-powered end plug to a given density and temperature are estimated.

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Section: Gas-puffing Experiments With An Icrf-stabilized Central Cellmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Gas fuelling of Rf-sustained tandem mirror end plugs

et al. 1984

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Observation of ion-cyclotron heating due to mode conversion of fast waves in a simple mirror

Yasaka

Takeno

Fukuyama

et al. 1992

Physics of Fluids B: Plasma Physics

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In this paper the observation of mode conversion of the m=−1 (right-rotating propagation) fast magnetosonic wave into the slow ion-cyclotron wave via the ion–ion hybrid resonance in a mirror magnetic field is presented. The left-circularly polarized component of the wave magnetic field strongly depends on the minority ion concentration in a helium–hydrogen plasma. The associated ion heating up to 250% of the initial value is in correlation with the enhancement of the left-circularly polarized component of the wave field, showing evidence of ion cyclotron heating due to the mode conversion. The two-dimensional calculation of the wave propagation and mode conversion is performed and compared with the experiment.

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Excitation characteristics of sideband wave in a radio frequency stabilized simple mirror plasma

Takeno

Yasaka

Itatani

1992

Physics of Fluids B: Plasma Physics

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A nonlinearly excited sideband wave due to a magnetohydrodynamic interchange mode is observed in a radio frequency (t-f)-produced simple mirror plasma, and its excitation is discussed. The measured amplitude of the sideband wave field is compared with the theoretical value showing the agreement in order of magnitude, but the radial distribution is different. As the rfcurrent of the production source is changed, the sideband excitation level varies and this variation is explained by the density fluctuation and the difference of the dispersion relations between pump and sideband waves. Using the difference of the dispersion relations, it would be possible to suppress the sideband excitation and to reduce its destabilizing contribution.

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RF stabilization of high-density plasma in an axisymmetric mirror II: empirical scaling

Cited by 17 publications

References 4 publications

Gas fuelling of Rf-sustained tandem mirror end plugs

Gas fuelling of Rf-sustained tandem mirror end plugs

Observation of ion-cyclotron heating due to mode conversion of fast waves in a simple mirror

Excitation characteristics of sideband wave in a radio frequency stabilized simple mirror plasma

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