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• W1001020799 abstract "Introduction The high-confinement mode (H-mode) is foreseen as the basic operation scenario for ITER. Unfortunately it usually drives transient, edge localized modes (ELMs), causing periodic expulsion of plasma energy and particles. In particular the type-I ELMs, can generate large energy losses from the main plasma, which can lead to unacceptably high heat power loads on the first wall elements, especially on the divertor target plates. ASDEX Upgrade is carrying out experimental studies to control the ELM frequency by mean of an appropriate technique in order to mitigate them. The most successful one was achieved triggering ELMs by cryogenic pellets that has also shown to be a promising technique to investigate ELM physics. Reflectometry, due to its high temporal and spatial resolution, is a diagnostic specially suited for this type of experiments. The ASDEX Upgrade FM-CW reflectometry system has 9 swept channels in K, Ka, Q, V and W frequency bands at the low field side (LFS) and in K, Ka, Q and V bands at the high field side (HFS), probing the plasma simultaneously. In swept mode these channels operate with a minimum repetition rate of 35 μs and in fixed frequency mode with a sampling rate up to 1 MHz. Previous reflectometry analyses of pellet experiments were focused on the study of density profiles (especially at LFS) in the regions between ELMs, where profiles are not distorted by the ELM activity. Comparing intrinsic and triggered ELMs phases no significant differences were found. In order to understand the plasma behavior it became clear that it was necessary to analyze also the density changes occurring during both types of ELMs. For example, it was previously demonstrated that intrinsic ELMs in ASDEX Upgrade start to evolve at the LFS but no indications exist about the evolution of their triggered counterpart. Usually during ELMs strong perturbations are present at the plasma edge and profile evaluation can become difficult, especially at the peak of the ELM. For this reason it was necessary to develop a new method that could visualize in a simple and direct way detailed local profile changes, without the need to evaluate the density profile. The method uses the spectrogram derived from swept frequency data (basic information for density profile inversion) and gives the temporal evolution of spectrogram slices centered at selected plasma densities. In order to have the best time resolution, dedicated experiments were made with all the sweeps at the maximum repetition rate of 35 μs (sweep duration 25 μs), corresponding to a total data acquisition window of 107.24 ms (limitation imposed by present system memory). New information could also be obtained at higher densities (up to 1.2·10 m) after the recent improvement of the W-band channel at the LFS." @default.
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• W1001020799 date "2005-01-01" @default.
• W1001020799 modified "2023-09-23" @default.
• W1001020799 title "A new spectral analysis to study pellet triggered ELMs from broadband reflectometry at ASDEX Upgrade" @default.
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