Observation of Second-Harmonic Ion Bernstein Waves Excited by Fast-Wave Mode Conversion in the Microtor Tokamak

Park, H.; Luhmann, Neville C.; Peebles, W. A.; Kirkwood, R. K.

doi:10.1103/physrevlett.52.1609

Cited by 28 publications

(10 citation statements)

References 6 publications

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“…Signatures of externally driven ion Bernstein waves have been measured with far-infrared CTS in plasmas at Microtor [30,31], ACT-1 [3] and Alcator-C [32]. Cyclotron structure was also found in mm-wave CTS measurements of ion cyclotron resonance heated (ICRH) plasmas in the Tara Tandem Mirror axicell [33].…”

Section: Resultsmentioning

confidence: 94%

Principles of fuel ion ratio measurements in fusion plasmas by collective Thomson scattering

Stejner¹,

Nielsen²,

Bindslev³

et al. 2011

Plasma Phys. Control. Fusion

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For certain scattering geometries collective Thomson scattering (CTS) measurements are sensitive to the composition of magnetically confined fusion plasmas. CTS therefore holds the potential to become a new diagnostic for measurements of the fuel ion ratio-i.e. the tritium to deuterium density ratio. Measurements of the fuel ion ratio will be important for plasma control and machine protection in future experiments with burning fusion plasmas. Here we examine the theoretical basis for fuel ion ratio measurements by CTS. We show that the sensitivity to plasma composition is enhanced by the signatures of ion cyclotron motion and ion Bernstein waves which appear for scattering geometries with resolved wave vectors near perpendicular to the magnetic field. We investigate the origin and properties of these features in CTS spectra and give estimates of their relative importance for fuel ion ratio measurements.

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Section: Resultsmentioning

confidence: 94%

Principles of fuel ion ratio measurements in fusion plasmas by collective Thomson scattering

Stejner¹,

Nielsen²,

Bindslev³

et al. 2011

Plasma Phys. Control. Fusion

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show abstract

“…Measurements of the waves themselves are particularly important since they serve as a direct test of the relevant wave physics. Scattering of a laser beam has been used on tokamak/stellarator plasmas to measure mode converted IBWs on Microtor 28,29 , TFR 30 ,…”

Section: Introductionmentioning

confidence: 99%

Measurements of ion cyclotron range of frequencies mode converted wave intensity with phase contrast imaging in Alcator C-Mod and comparison with full-wave simulations

et al. 2012

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Radio frequency waves in the ion cyclotron range of frequencies (ICRF) are widely used to heat tokamak plasmas. In ICRF heating schemes involving multiple ion species, the launched fast waves convert to ion cyclotron waves or ion Bernstein waves at the two-ion hybrid resonances. Mode converted waves are of interest as actuators to optimise plasma performance through current drive and flow drive. In order to describe these processes accurately in a realistic tokamak geometry, numerical simulations are essential, and it is important that these codes be validated against experiment. In this study, the mode converted waves were measured using a phase contrast imaging technique in D-H and D-3 He plasmas. The measured mode converted wave intensity in the D-3 He mode conversion regime was found to be a factor of ∼50 weaker than the full-wave predictions. The discrepancy was reduced in the hydrogen minority heating regime, where mode conversion is weaker.a)

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“…5 Most important of these is the possibility of multiple harmonics of the fast wave frequency appearing as sidebands in the reflected waves. The key attraction of the method lies in its localization and sensitivity to fluctuations near the cutoff for long wavelength modes.…”

Section: Introductionmentioning

confidence: 99%

Application of microwave reflectometry to the measurement of fast magnetosonic waves in the Tokamak Fusion Test Reactor

Nazikian

Majeski

Mazzucato

et al. 1997

Review of Scientific Instruments

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Observation of Second-Harmonic Ion Bernstein Waves Excited by Fast-Wave Mode Conversion in the Microtor Tokamak

Cited by 28 publications

References 6 publications

Principles of fuel ion ratio measurements in fusion plasmas by collective Thomson scattering

Principles of fuel ion ratio measurements in fusion plasmas by collective Thomson scattering

Measurements of ion cyclotron range of frequencies mode converted wave intensity with phase contrast imaging in Alcator C-Mod and comparison with full-wave simulations

Application of microwave reflectometry to the measurement of fast magnetosonic waves in the Tokamak Fusion Test Reactor

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