Excitation of Icrf Waves in RFC-Xx Device

Experimental data for ion cyclotron resonance heating in the RFC-XX machine in IPP-Nagoya are presented. The achieved ion temperature is as high as 100 eV at n = 1013 cm−3 and 1 keV at n = 1012 cm−3. The ion energy confinement becomes worse by the application of a longer pulse, which is found to be due to the enhanced charge-exchange loss and/or electron drag. Axially and azimuthally arrayed antennas are used in the heating, and the importance of the phasing is demonstrated. A simple model of the multiple-antenna problem is also given and used to interpret the experimental data.

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“…This machine was built to test radiofrequency confinement; preliminary results are given in Ref. [ 1 ].…”

Section: Introductionmentioning

confidence: 99%

A slow-wave heating experiment on RFC-XX using an array of phased antennas

et al. 1982

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“…We note the absence of a cut-off density for the m = -1 wave. This wave is capable of being excited in RFC-XX as opposed to the m = 0, 1 fast waves which have cut-off densities well above 10 14 cm" 3 For the ion cyclotron branch, the density for eigenmode resonance scales approximately with k|.…”

Section: Radial Mode Structure Of Rf Electric Fieldsmentioning

confidence: 98%

“…In simple terms, a stabilizing outward radial force such as that provided by a ponderomotive potential is required in the central cell to counteract the destabilizing inward radial force caused by the negative curvature of the field lines in the cusp. Recent experiments on simple mirrors have shown evidence of RF ponderomotive stabilization [3][4][5]. Initial theoretical work on this topic has also been reported [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Suppression of flute instability in an axisymmetric double-cusp plasma by RF ponderomotive force

Parks¹,

Baker²

1984

Nucl. Fusion

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An analysis is made of the stabilizing effect of a radial ponderomotive force on the interchange mode in a double-cusp mirror plasma which has unfavourable curvature on internal flux surfaces. A cavity mode in the long central cell region is set up by exciting electromagnetic ion cyclotron waves and it provides the radial force which opposes the curvature drive. Application of this method to RFC-XX shows that the ICRH power needed for stabilization is comparable to that needed for heating.

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“…This antenna produces a rotating RF field of the m = +1 mode at a frequency which is slightly lower than the local ion cyclotron frequency. The m = +l mode has been confirmed to give better heating efficiency than the m = ±1 mode that is used conventionally [2][3][4]. We use this antenna to change the ion temperature through ion cyclotron heating.…”

Section: Description Of the Experimentsmentioning

confidence: 99%