UKAEA-CCFE-PR(24)253
FPGA based Langmuir probe system for measurement of plasma parameters at 500 kHz in a HiPIMS plasma
By utilising Field Programmable Gate Arrays (FPGA), in a configuration similar to that of the Mirror Langmuir Probe, it is possible to bias a single probe at 3 precise voltages in sequence. These voltages can be dynamically adjusted in real-time based on the measured plasma temperature to ensure the transition region is always sampled. First results have been obtained by employing this method and have generated real time outputs of electron temperature, ion saturation current, and floating potential on a low temperature pulsed-DC magnetron. This probe is designed with the intention to be implemented onto MAST-U to aid in the study of exhaust physics and enable further investigation into filamentary behaviour.