Evaluation of ITER divertor shunts as a synthetic diagnostic for detachment control

Orrico, Christopher A.; Ravensbergen, Timo; Pitts, Richard A.; Bonnin, X.; Kaveeva, Elizaveta; Park, Jae-Sun; Rozhansky, V.; Senichenkov, Ilya; Watts, C.; de Baar, M.

doi:10.1088/1741-4326/acd947

Evaluation of ITER divertor shunts as a synthetic diagnostic for detachment control

Journal Article · Thu Jun 15 00:00:00 EDT 2023 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/acd947· OSTI ID:1985378

^[1]; ^[2]; ^[2]; Bonnin, X. ^[2]; ^[3]; ^[4]; Rozhansky, V. ^[3]; ^[3]; Watts, C. ^[2]; de Baar, M. ^[5]

Eindhoven Univ. of Technology (Netherlands); ITER Organization, St. Paul Lez Durance (France)
ITER Organization, St. Paul Lez Durance (France)
Peter the Great St. Petersburg Polytechnic University, (Russian Federation)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Dutch Institute for Fundamental Energy Research, Eindhoven (Netherlands)

Reliable diagnostics that measure the detached state of the ITER divertor plasma will be necessary to control heat flux to the divertor targets during steady state, burning plasma operation. This paper conducts an initial exploration into the feasibility of the divertor shunt diagnostic as a lightweight, robust, and real-time detachment sensor. This diagnostic is a set of shunt lead pairs that measure the voltage drop along the divertor cassette body, from which the plasma scrape-off layer (SOL) current is calculated. Using SOLPS-ITER simulations for control-relevant ITER plasma scenarios, the thermoelectric current magnitude along the SOL is shown to decrease significantly with the onset of partial detachment at the outer divertor target. Electromagnetic modelling of a simplified divertor cassette is used to develop a control-oriented inductance-resistance circuit model, from which SOL currents can be calculated from shunt pair voltage measurements. The sensitivity and frequency-response of the resulting system indicates that the diagnostic will accurately measure SOL thermoelectric currents during ITER operation. These currents will be a good measure of the detached state of the divertor plasma, making the divertor shunt diagnostic a potentially extremely valuable and physically robust sensor for real-time detachment control.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1985378

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 8 Vol. 63; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Detachment
Divertor
Exhaust
Plasma control
SOLPS-ITER
Synthetic diagnostics

Evaluation of ITER divertor shunts as a synthetic diagnostic for detachment control

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