We report the first applications of the quasioptical (QO) ray tracing code PARADE (PAraxial RAy DEscription) for modeling electron cyclotron emission (ECE) diagnostic. Geometrical optics (GO) has been exploited to predict the ECE intensity received into the antenna. Nevertheless, due to the fact that an actual receiving antenna has finite sensitivity not only for the line of sight direction...
In present and future magnetic confinement fusion devices, Electron Cyclotron Emission (ECE) diagnostics are key for the measurement of the electron temperature profile and its fluctuations, often providing data complementary to Thomson Scattering systems. By virtue of their fast time response, ECE diagnostics also provide indispensable information for plasma operation, through real-time...
A 105 GHz collective Thomson scattering (CTS) diagnostic for measurement of velocity distribution of fast ions has been developed on HL-2A tokamak. A high gain Cassegrain antenna installed below the gyrotron launcher is used to receive the scattering beam from the central chord inside the vacuum vessel. The transmission system and notch filters provide a suppression level >60 dB at 105 GHz, to...
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The electron cyclotron maser instability (ECMI) has been considered as the mechanism of the coherent radio bursts called auroral kilometric radiation emitted from the auroral zone where the electrons are accelerated along the magnetic field line. The excitation of the ECMI is explained as the enhancement of positive 𝜕f/𝜕v⊥ as the effect of the magnetic compression. The electron cyclotron...
