2013
DOI: 10.1088/0741-3335/55/11/115003
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Experimental characterization of anomalous strong scattering of mm-waves in TEXTOR plasmas with rotating islands

Abstract: Anomalous scattering of high power millimetre waves from gyrotrons at 140 and 110 GHz is investigated for plasma with rotating islands at TEXTOR. The magnetic field and plasma density influence the spectral content of the scattered waves and their power levels significantly. Anomalous strong scattering occurs in two density regimes, one at low densities and one at high densities, that also depend on the magnetic field. The two regimes are separated by a quiescent regime without anomalous scattering. Investigat… Show more

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Cited by 99 publications
(125 citation statements)
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“…Such signals were first observed in TEXTOR [3,4], where a strong dependence of the measured power from the magnetic field and the plasma density was evidenced, as described in [4]. Similar evidences were subsequently found also in ASDEX and FTU.…”
Section: Introductionsupporting
confidence: 65%
“…Such signals were first observed in TEXTOR [3,4], where a strong dependence of the measured power from the magnetic field and the plasma density was evidenced, as described in [4]. Similar evidences were subsequently found also in ASDEX and FTU.…”
Section: Introductionsupporting
confidence: 65%
“…The analyzed parametric decay possesses a very low threshold power of several tens kW and the growth rate being extremely large , which is similar to [3]. The saturation of this strong instability could occur at the level leading to substantial power transfere into UH waves affecting the power budget of the ECRH as it according to [3] was the case in ECRH experiments in TEXTOR tokamak [1,2]. The nonlinear coupling of the UH plasmons is a possible candidate for explanation of the anomalous scattering effect observed in the ECRH experiments in ASDEX Upgrade tokamak [9].…”
Section: Discussionmentioning
confidence: 66%
“…The nonlinear induced charge densities 1,2  arising on the RHS of equations (4) describe coupling of the daughter UH waves in the presence of the pump wave (2). Their explicit representation is given below.…”
Section: Parametric Excitation Of the 2d Trapped Uh Waves By The Pumpmentioning
confidence: 99%
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