Synthetic Diagnostic Assessment of ITER ECE Performance for NTM Detection
POSTER
Abstract
A synthetic diagnostic for the ECE system has demonstrated low-latency detection of neoclassical tearing modes (NTM) and was used to inform radiometer design and optimization. Magnetic islands associated with the 2/1 NTM and as small as 3 cm are shown to be detectable, with detection latency on order of 100s of ms. These studies used a novel helical-flux perturbation model to simulate NTMs. It incorporates the most up-to-date models of island growth and rotation in an ITER plasma, as well as relativistic effects on ECE. The synthetic diagnostic is incorporated into a high-fidelity plasma simulator under development at ITER. The inclusion of the synthetic ECE diagnostic and NTM modeling into an ITER network compatible workflow will allow self-consistent end-to-end testing of ITER IMAS database plasma scenarios. From ramp-up to ramp-down, the expected ECE is modeled for scenarios spanning the ITER operational range. The results inform diagnostic capabilities and operation and provide quantitative guidance for configuration and NTM mitigation strategies.
*Work supported by the U.S. DOE under Contract No. DE-AC02-09CH11466 with Princeton University and Contract No. DE-FG02-04ER54742. All U.S. ITER activities are managed by the U.S. ITER Project Office, hosted by Oak Ridge National Laboratory with partner labs Princeton Plasma Physics Laboratory and Savannah River National Laboratory. The project is being accomplished through a collaboration of DOE Laboratories, universities, and industry. The views and opinions expressed herein do not necessarily reflect those of the ITER Organization.
Presenters
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Joseph P Ziegel
- University of Texas at Austin