Abstract:This presentation focuses on a real-life problem in the daily operation of plasma diagnostics. Due to the co-existence of high-power heating systems in the MW range and diagnostic equipment sensitive on the microwatt to milliwatt level in the torus hall, electromagnetic interference (EMI) is a critical issue. Taking ICRF heating as an example of an EMI source, a few pratical design guidelines will be presented which have been found to be effective in preventing EMI from affecting diagnostic signals. In addition, the DCN interferometer will serve as an example that later EMI hardening of an existing diagnostic that is not compliant with these design guidelines can be a long-lasting project that involves many steps by trial and error.The talk intends to provide diagnosticians with hints on EMI-resistant electronics design, and to initiate the discussion on how to continue the EMI hardening efforts on the interferometer.
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