Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 17: Poster Session II

P 17.2: Poster

Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG

Implementation and exploitation of new bolometer electronics at ASDEX Upgrade — •Alessandro Mancini and Matthias Bernert — Max Planck Institute for Plasma Physics, Garching, Germany

Bolometry is a diagnostic technique employed in magnetic confinement nuclear fusion machines, like tokamaks and stellarators. It measures the full electromagnetic power (visible to soft X rays, without spectral information) radiated by fusion plasmas. This measure is essential for the global power balance of a fusion reactor. Foil ('resistive') bolometers are a type of bolometer which use thin metallic foils that heat up upon radiation absorption. The foils are connected to resistors, arranged as Wheatstone bridge, whose electrical resistance varies according to their temperature. The bolometer cameras are connected to an electronic system that provides an excitation voltage waveform and measures the bridges response voltage, from which the incident radiation power can be inferred. An amplitude demodulation algorithm is used to obtain the real time incident power. So far only a square waveform has been used for the ASDEX Upgrade foil bolometers. New electronics have been designed at ASDEX Upgrade, capable of driving different excitation waveforms. With this contribution an amplitude demodulation technique for sinusoidal waveforms, which is implemented on an FPGA, is presented, with the goal of improving the signal quality and time resolution of foil bolometers. The new system has been tested in the laboratory and in the current ASDEX Upgrade experimental campaign.

Keywords: Bolometry; Electromagnetic radiation; Electronics; FPGA; ASDEX Upgrade