Diagnostic Edge Cases – Physics of q-parallel disagreements
2024 Research Campaign, Diagnostics and Actuators
Purpose of Experiment
The physics for interpreting plasma diagnostics is often as complex as the plasma physics we seek to unravel. DIII-D is equipped with four diagnostics capable of measuring the parallel heat flux to the target, and good agreement is typically found [1,2], but edge cases exist where measurements do not agree [6] including cases where the sheath heat transmission coefficient needed to bring the measurements into mutual agreement are non-physical [3-5]. The purpose of this experiment is to explore the plasma physics for the far more interesting cases where these diagnostics do not agree.