| Paper | Title | Page |
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THSDSC02 |
A High Resolution Multichannel Acquisition System for Magnetic Measurements of Fusion Experiments | |
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| Magnetic fusion experiments rely mainly on coil loops as the primary type of magnetic sensors, offering precision, reliability, and robustness. However, to analyze the magnetic field, the sensors signals need to be time-integrated. Usually, analog integrators were employed due to their wide dynamic range, but they present complexity challenges. The need for a separate channel for the derivative (dB/dt) signals is also required to measure fast events, plasma instabilities, and magnetic turbulences. In this work, we propose a novel system design based on high-resolution analog-to-digital converters (ADCs) that eliminates the need for analog integrators and the second acquisition channel, simplifying the overall system. The system uses 1 MS/s, 20-bit ADCs, electrically comparable to good analog integrators. To ensure accurate measurements, each acquisition channel is electrically isolated, effectively eliminating the ground loops generated by the experiment’s magnetic fields. The system architecture is implemented on 6U boards, where each board serves as an autonomous system housing 12 input channels and its own SOC-FPGA, with a total of 144 channels on a 6U sub-rack. Each board simultaneously provides three essential functionalities: a timing synchronization decoder, transient recording of full-speed ADC data, and continuous Ethernet UDP transmission of subsampled signals to the real-time control system. This comprehensive approach allows for efficient data acquisition, analysis, and integration into the experiment’s control framework. | ||
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