Enhancement of detachment control with simplified real-time modelling on the KSTAR tokamak

Eldon, D.; Anand, H.; Bak, J-G; Barr, J.; Hahn, S-H; Jeong, J. H.; Kim, H-S; Lee, H. H.; Leonard, A. W.; Sammuli, B.; Shin, G. W.; Wang, H. Q.

doi:10.1088/1361-6587/ac6ff9

Title: Enhancement of detachment control with simplified real-time modelling on the KSTAR tokamak

Journal Article · Thu May 26 00:00:00 EDT 2022 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/ac6ff9· OSTI ID:1870176

;

; Bak, J-G;

;

; Jeong, J. H.; Kim, H-S; Lee, H. H.;

; Sammuli, B.;

;

Abstract Detachment control based on ion saturation current I _sat measurements from Langmuir probes (LPs) is implemented in the KSTAR tokamak and shown to be capable of following dynamic and constant target trajectories with good accuracy, in H-mode, by moderating the flow rate of nitrogen or deuterium. I _sat controllers normalize I _sat in order to form attachment fraction ( A _frac ) as their control parameter. The KSTAR implementation of A _frac control differs from previous work in that it continuously calculates a model for attached I _sat and uses that as the denominator in A _frac , whereas prior implementations either record peak I _sat at rollover as they pass it or take estimated $I_{s a t, r o l l o v e r}$ as a manual input prior to the shot. The KSTAR controller therefore does not need to keep track of rollover status and keep separate targets for pre- and post-rollover states, and it can automatically adapt to changes in scenario at any time. It is also less vulnerable to noise as it will not lock in an outlier as a rollover point.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FC02-04ER54698; SC0010685

OSTI ID:: 1870176

Alternate ID(s):: OSTI ID: 1867906; OSTI ID: 1972727

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Vol. 64 Journal Issue: 7; ISSN 0741-3335

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

References (32)

Electric probe diagnostics for measuring SOL parameters, wall and divertor fluxes in KSTAR Kim, Heung-Su; Bak, Jun-Gyo; Bae, Min-Keun Fusion Engineering and Design, Vol. 109-111 https://doi.org/10.1016/j.fusengdes.2016.01.070	journal	November 2016
The dependence of divertor power sharing on magnetic flux balance in near double-null configurations on Alcator C-Mod Brunner, D.; Kuang, A. Q.; LaBombard, B. Nuclear Fusion, Vol. 58, Issue 7 https://doi.org/10.1088/1741-4326/aac006	journal	May 2018
Integrated modeling applications for tokamak experiments with OMFIT Meneghini, O.; Smith, S. P.; Lao, L. L. Nuclear Fusion, Vol. 55, Issue 8 https://doi.org/10.1088/0029-5515/55/8/083008	journal	July 2015
Atomic processes leading to asymmetric divertor detachment in KSTAR L-mode plasmas Park, Jae Sun; Groth, Mathias; Pitts, Richard Nuclear Fusion, Vol. 58, Issue 12 https://doi.org/10.1088/1741-4326/aae865	journal	November 2018
Reconstruction of current profile parameters and plasma shapes in tokamaks Lao, L. L.; St. John, H.; Stambaugh, R. D. Nuclear Fusion, Vol. 25, Issue 11 https://doi.org/10.1088/0029-5515/25/11/007	journal	November 1985
Thermographic studies of outer target heat fluxes on KSTAR Lee, H. H.; Pitts, R. A.; Kang, C. S. Nuclear Materials and Energy, Vol. 12 https://doi.org/10.1016/j.nme.2016.12.019	journal	August 2017
Plasma detachment in JET Mark I divertor experiments Loarte, A.; Monk, R. D.; Martín-Solís, J. R. Nuclear Fusion, Vol. 38, Issue 3 https://doi.org/10.1088/0029-5515/38/3/303	journal	March 1998
Survey of target plate heat flux in diverted DIII-D tokamak discharges Lasnier, C. J.; Hill, D. N.; Petrie, T. W. Nuclear Fusion, Vol. 38, Issue 8 https://doi.org/10.1088/0029-5515/38/8/209	journal	August 1998
A flexible software architecture for tokamak discharge control systems Ferron, J. R.; Penaflor, B.; Walker, M. L. Proceedings of 16th International Symposium on Fusion Engineering https://doi.org/10.1109/FUSION.1995.534361	conference	January 1995
An analysis of controlled detachment by seeding various impurity species in high performance scenarios on DIII-D and EAST Eldon, D.; Wang, H. Q.; Wang, L. Nuclear Materials and Energy, Vol. 27 https://doi.org/10.1016/j.nme.2021.100963	journal	June 2021
Empiricial scaling of inter-ELM power widths in ASDEX Upgrade and JET Eich, T.; Sieglin, B.; Scarabosio, A. Journal of Nuclear Materials, Vol. 438 https://doi.org/10.1016/j.jnucmat.2013.01.011	journal	July 2013
Plasma detachment in divertor tokamaks Leonard, A. W. Plasma Physics and Controlled Fusion, Vol. 60, Issue 4 https://doi.org/10.1088/1361-6587/aaa7a9	journal	February 2018
Integration of full divertor detachment with improved core confinement for tokamak fusion plasmas Wang, L.; Wang, H. Q.; Ding, S. Nature Communications, Vol. 12, Issue 1 https://doi.org/10.1038/s41467-021-21645-y	journal	March 2021
Density limits in toroidal plasmas Greenwald, Martin Plasma Physics and Controlled Fusion, Vol. 44, Issue 8 https://doi.org/10.1088/0741-3335/44/8/201	journal	July 2002
Observation of fully detached divertor integrated with improved core confinement for tokamak fusion plasmas Wang, H. Q.; Wang, L.; Ding, S. Physics of Plasmas, Vol. 28, Issue 5 https://doi.org/10.1063/5.0048428	journal	May 2021
Controlling marginally detached divertor plasmas Eldon, D.; Kolemen, E.; Barton, J. L. Nuclear Fusion, Vol. 57, Issue 6 https://doi.org/10.1088/1741-4326/aa6b16	journal	May 2017
Advances in radiated power control at DIII-D Eldon, D.; Kolemen, E.; Humphreys, D. A. Nuclear Materials and Energy, Vol. 18 https://doi.org/10.1016/j.nme.2019.01.010	journal	January 2019
Identifying the location of the OMP separatrix in DIII-D using power accounting Stangeby, P. C.; Canik, J. M.; Elder, J. D. Nuclear Fusion, Vol. 55, Issue 9 https://doi.org/10.1088/0029-5515/55/9/093014	journal	August 2015
Real time equilibrium reconstruction for tokamak discharge control Ferron, J. R.; Walker, M. L.; Lao, L. L. Nuclear Fusion, Vol. 38, Issue 7 https://doi.org/10.1088/0029-5515/38/7/308	journal	July 1998
H mode power threshold database for ITER Snipes, J. A.; Granetz, R. S.; Greenwald, M. Nuclear Fusion, Vol. 36, Issue 9 https://doi.org/10.1088/0029-5515/36/9/I11	journal	September 1996
Physics basis for the first ITER tungsten divertor Pitts, R. A.; Bonnin, X.; Escourbiac, F. Nuclear Materials and Energy, Vol. 20 https://doi.org/10.1016/j.nme.2019.100696	journal	August 2019
Progress in quantifying the edge physics of the H mode regime in DIII-D Groebner, R. J.; Baker, D. R.; Burrell, K. H. Nuclear Fusion, Vol. 41, Issue 12 https://doi.org/10.1088/0029-5515/41/12/306	journal	December 2001
Scaling of the tokamak near the scrape-off layer H-mode power width and implications for ITER Eich, T.; Leonard, A. W.; Pitts, R. A. Nuclear Fusion, Vol. 53, Issue 9 https://doi.org/10.1088/0029-5515/53/9/093031	journal	August 2013
Development and experimental qualification of novel disruption prevention techniques on DIII-D Barr, J. L.; Sammuli, B.; Humphreys, D. A. Nuclear Fusion, Vol. 61, Issue 12 https://doi.org/10.1088/1741-4326/ac2d56	journal	October 2021
High precision strike point control to support experiments in the DIII-D small angle slot divertor Eldon, D.; Hyatt, A. W.; Covele, B. Fusion Engineering and Design, Vol. 160 https://doi.org/10.1016/j.fusengdes.2020.111797	journal	November 2020
Analysis of a multi-machine database on divertor heat fluxes Makowski, M. A.; Elder, D.; Gray, T. K. Physics of Plasmas, Vol. 19, Issue 5 https://doi.org/10.1063/1.4710517	journal	May 2012
The first implementation of active detachment feedback control in EAST PCS Yuan, Q. P.; Wu, K.; Wang, L. Fusion Engineering and Design, Vol. 154 https://doi.org/10.1016/j.fusengdes.2020.111557	journal	May 2020
Real-time classification of L-H transition and ELM in KSTAR Shin, Giwook; Juhn, J. -W.; Kwon, G. I. Fusion Engineering and Design, Vol. 157 https://doi.org/10.1016/j.fusengdes.2020.111634	journal	August 2020
Real-time control of divertor detachment in H-mode with impurity seeding using Langmuir probe feedback in JET-ITER-like wall Guillemaut, C.; Lennholm, M.; Harrison, J. Plasma Physics and Controlled Fusion, Vol. 59, Issue 4 https://doi.org/10.1088/1361-6587/aa5951	journal	February 2017
CAKE: Consistent Automatic Kinetic Equilibrium reconstruction Xing, Z. A.; Eldon, D.; Nelson, A. O. Fusion Engineering and Design, Vol. 163 https://doi.org/10.1016/j.fusengdes.2020.112163	journal	February 2021
Multi-machine analysis of termination scenarios with comparison to simulations of controlled shutdown of ITER discharges de Vries, P. C.; Luce, T. C.; Bae, Y. S. Nuclear Fusion, Vol. 58, Issue 2 https://doi.org/10.1088/1741-4326/aa9c4c	journal	December 2017
The design of two color interferometer system for the 3-dimensional analysis of plasma density evolution on KSTAR Lee, K. C.; Juhn, J. -W.; Nam, Y. U. Fusion Engineering and Design, Vol. 113 https://doi.org/10.1016/j.fusengdes.2016.10.008	journal	December 2016

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