Robust Control of ECH Deposition Profiles on DIII-D
Abstract
Electron Cyclotron Heating (ECH) is a key actuator in DIII-D and future tokamaks that provides auxiliary heating, localized current drive for scenario development and MHD stability, and even impurity pump-out. Due to its control flexibility and applications, a gyrotron optimization algorithm was developed to multitask and fine-tune the deposition location and heating power of each gyrotron while providing robustness to hardware failure. The ECH Optimization (ECHO) algorithm finds the optimal gyrotron mirror angle and power to achieve a target ECH radial deposition profile. This optimization is accomplished in real-time using a parallelized neural network surrogate of the TORBEAM code combined with a genetic optimizer. This has been deployed in a DIII-D experiment and has been validated with experimental ECE measurements and post-experiment offline ray tracing, showing the algorithm's reliability despite gyrotron failures and significant changes to plasma parameters.
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BibTeX
@misc{farrekaga2026robust,
title = {{Robust Control of ECH Deposition Profiles on DIII-D}},
author = {H. J. Farre-Kaga and A. Rothstein and K. Yasoda and J. Lestz and N. Chen and S. K. Kim and A. Jalalvand and E. Kolemen},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2606.13661},
eprint = {2606.13661},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.13661},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Robust Control of ECH Deposition Profiles on DIII-D
AU - H. J. Farre-Kaga
AU - A. Rothstein
AU - K. Yasoda
AU - J. Lestz
AU - N. Chen
AU - S. K. Kim
AU - A. Jalalvand
AU - E. Kolemen
PY - 2026
DA - 2026/09/11
PB - arXiv
DO - 10.48550/arxiv.2606.13661
UR - https://arxiv.org/abs/2606.13661
AB - Electron Cyclotron Heating (ECH) is a key actuator in DIII-D and future tokamaks that provides auxiliary heating, localized current drive for scenario development and MHD stability, and even impurity pump-out. Due to its control flexibility and applications, a gyrotron optimization algorithm was developed to multitask and fine-tune the deposition location and heating power of each gyrotron while providing robustness to hardware failure. The ECH Optimization (ECHO) algorithm finds the optimal gyrotron mirror angle and power to achieve a target ECH radial deposition profile. This optimization is accomplished in real-time using a parallelized neural network surrogate of the TORBEAM code combined with a genetic optimizer. This has been deployed in a DIII-D experiment and has been validated with experimental ECE measurements and post-experiment offline ray tracing, showing the algorithm's reliability despite gyrotron failures and significant changes to plasma parameters.
ER -