Demonstration of H-mode Error Field Identification in a Single Discharge via Island Healing
Abstract
Non-disruptive compass scan error field identification via island healing is demonstrated on KSTAR in a single H-mode discharge. This method can allow for up to a 75% reduction in the operational time necessary for a complete compass scan by reducing the required discharges from four to one. Previous experiments on DIII-D, JET, and MAST-U have demonstrated the technique in Ohmic and L-mode but required multiple discharges and strong real-time n=1 magnetics diagnostics close to the plasma that are unlikely to be viable for future devices. The results presented here were made possible by implementing a new set of triggering algorithms relevant to fusion pilot plant operation into the KSTAR plasma control system, along with KSTAR's strong RMPs and long pulse lengths. This represents a significant step towards the disruption-free error field identification method being demonstrated for deployment on future disruption-averse tokamaks, including ITER and fusion pilot plants. Steps needed to close remaining gaps to viability are addressed.
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BibTeX
@misc{bursch2026demonstration,
title = {{Demonstration of H-mode Error Field Identification in a Single Discharge via Island Healing}},
author = {E. M. Bursch and A. Xie and J. L. Barr and S. K. Kim and N. C. Logan and S. M. Yang and J. G. Bak and W. Choi and Q. Hu and J. W. Juhn and J. Kim and J. Lee and N. Leuthold and J. K. Park and C. Paz-Soldan and L. Piron and G. Seo and J. Seo},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.30452},
eprint = {2609.30452},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.30452},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Demonstration of H-mode Error Field Identification in a Single Discharge via Island Healing
AU - E. M. Bursch
AU - A. Xie
AU - J. L. Barr
AU - S. K. Kim
AU - N. C. Logan
AU - S. M. Yang
AU - J. G. Bak
AU - W. Choi
AU - Q. Hu
AU - J. W. Juhn
AU - J. Kim
AU - J. Lee
AU - N. Leuthold
AU - J. K. Park
AU - C. Paz-Soldan
AU - L. Piron
AU - G. Seo
AU - J. Seo
PY - 2026
DA - 2026/09/24
PB - arXiv
DO - 10.48550/arxiv.2609.30452
UR - https://arxiv.org/abs/2609.30452
AB - Non-disruptive compass scan error field identification via island healing is demonstrated on KSTAR in a single H-mode discharge. This method can allow for up to a 75% reduction in the operational time necessary for a complete compass scan by reducing the required discharges from four to one. Previous experiments on DIII-D, JET, and MAST-U have demonstrated the technique in Ohmic and L-mode but required multiple discharges and strong real-time n=1 magnetics diagnostics close to the plasma that are unlikely to be viable for future devices. The results presented here were made possible by implementing a new set of triggering algorithms relevant to fusion pilot plant operation into the KSTAR plasma control system, along with KSTAR's strong RMPs and long pulse lengths. This represents a significant step towards the disruption-free error field identification method being demonstrated for deployment on future disruption-averse tokamaks, including ITER and fusion pilot plants. Steps needed to close remaining gaps to viability are addressed.
ER -