2010
DOI: 10.1103/physrevlett.104.245002
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Observation of Beat Oscillation Generation by Coupled Waves Associated with Parametric Decay during Radio Frequency Wave Heating of a Spherical Tokamak Plasma

Abstract: We present an observation of beat oscillation generation by coupled modes associated with parametric decay instability (PDI) during radio frequency (rf) wave heating experiments on the Tokyo Spherical Tokamak-2. Nearly identical PDI spectra, which are characterized by the coexistence of the rf pump wave, the lower-sideband wave, and the low-frequency oscillation in the ion-cyclotron range of frequency, are observed at various locations in the edge plasma. A bispectral power analysis was used to experimentally … Show more

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Cited by 6 publications
(4 citation statements)
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“…All of the 17 major junctional and 18 downstream signaling or junctional regulating proteins ( Figure 1a ) known to play important roles in regulating EC junctions, 3 , 5 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 are potential targets of at least one member of miR-23-27-24 clusters. Thus, it is highly likely that the whole cistron has a major role in governing endothelial function.…”
Section: Resultsmentioning
confidence: 99%
“…All of the 17 major junctional and 18 downstream signaling or junctional regulating proteins ( Figure 1a ) known to play important roles in regulating EC junctions, 3 , 5 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 are potential targets of at least one member of miR-23-27-24 clusters. Thus, it is highly likely that the whole cistron has a major role in governing endothelial function.…”
Section: Resultsmentioning
confidence: 99%
“…There are other processes by which the heating heats turbulence: For instance, the parametric coupling between RF waves (for heating) and fluctuations that induce transport can cause an additional path for the direct influence of heating on turbulent transport. Recent experimentation has observed the beat oscillation generation by coupled waves via parametric decay during RF wave heating [38]. If such a mechanism works, the turbulence intensity includes the component, which increases with the RF wave intensity (amplitude squared).…”
Section: Summary and Discussionmentioning
confidence: 99%
“…TST-2 is a small spherical tokamak device with major radius R 0 ∼ 0.38 m, minor radius a ∼ 0.25 m (aspect ratio A ≥ 1.5), elongation κ ≤ 1.2-1.8, and toroidal magnetic field B t ≤ 0.3 T. Typical plasma parameters are: plasma current I p ≤ 200 kA, line-averaged electron density n e ≤ 2 × 10 19 m −3 , and electron temperature at plasma center T e,0 = 100-300 eV. There are two kinds of operation in TST-2: One is ohmically heated discharge with/without auxiliary rf heatings at the ion cyclotron (21 MHz) and lower-hybrid (200 MHz) range of frequency [9,10]. The other is electron cyclotron heating (ECH) discharge [11].…”
Section: Methodsmentioning
confidence: 99%