Overview of MHD Optimization Proposal Ideas
The proposal outlines various candidates for de-optimized configurations concerning MHD stability, including engineering checks and operational parameters for different pressure profiles. Notably, it highlights the impact of configurations on divertor loads and the importance of considering influences such as toroidal currents and coil geometry. The document also presents new configurations related to MHD stability predictions, emphasizing collaboration among different proponents and the need for comprehensive experimental validation.
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Presentation Transcript
Overview of proposal ideas concerning MHD optimization T.Andreeva, J. Geiger & TG MHD 19.02.2025 TG MHD, 03.03.2022
Candidates for the proposal on de-optimized configurations configuration name engineering checks min < > to observe instabilities divertor loads* comments ILD (low shear ) o k 1.7% (peaked pressure profiles) 1.5-1.6% (broad pressure profiles) high heat flux on the baffle 2.5 T operation problems with clashes seem to be acceptable, but one needs to accompany experiments with EN-measurements; 0.5% overload of vertical div. targets and baffles 1.7 T operation UFM the number of pin-cycles are under evaluation (ANSYS) on-going NCM, JCM, JCM001: > 1.7% (peaked pressure profiles) should be analyzed new conf. * w/o taking into account influence of toroidal currents, finite beta effects, as-built coil geometry, deformations under e/m loads 19.02.2025 TG MHD, 03.03.2022
New configurations w.r.t. MHD-stability predictions Right configuration DB to be used for proposals: https://w7x-info.ipp-hgw.mpg.de Old test-DB (not valid any more!): https://sv-it-dev-4.ipp-hgw.mpg.de:8443/ords/w7x/r/magnetic-field-configurations/login 19.02.2025 TG MHD, 03.03.2022
New configurations w.r.t other topics 19.02.2025 TG MHD, 03.03.2022
Proposal ideas Topic Subtopic Configuration Proponents Comments De-optimized configurations low shear approach low iota, high mirror approach ILD @2.5T UFM @1.7T TA, JG, CN TA, JG, CN de-opt. vs. optimized configurations ST, HM (same conditions as in ILD, UFM) TA, JG, CN 19.02.2025 TG MHD, 03.03.2022
Proposal ideas Topic Subtopic Conf. Proponents Comments Investigation of the mirror term and shear influence on MHD-stability properties in 5/5 finite-beta configurations and covers long discharges at two beta values (x2- and x3-heating scenarios) in standard, high mirror and other ref. configurations. Reference configurations: stability; documentation of main properties Investigation of the MHD- stability in 5/5 reference magnetic configurations ST, HM, other TA, JG Investigation of the mirror term and shear influence on MHD-stability properties in finite-beta configurations (standard and high mirror). Proposal envisages short high performance discharges. Investigation of the MHD- stability in standard and high mirror magnetic configurations in high performance discharges Investigation of the MHD- stability in low iota and high iota magnetic configurations in high performance discharges ST, HM, other TA, JG Investigation of the mirror term and shear influence on MHD-stability properties in finite-beta configurations (low iota and high iota). Proposal envisages short high performance discharges. LJ, HJ TA, JG 19.02.2025 TG MHD, 03.03.2022
Proposal ideas Topic Subtopic Conf. Proponents Comments Iota scan: HJ-ST, diff. island size HJ, ST TA, JG TG Scenarios configuration effects Iota scan with rotated islands HJ, ST TA, JG probably also @1.7 T Poloidally rotated islands to check influence on NBI heating efficiency O. Ford possible proposal Iota scan with rotated islands with different island size HJ, ST TA, JG probably also @1.7 T Investigation of internal islands and off-axis current drive inside island chains HT ECCD-induced internal islands: ECCD modulation J. Schilling possible proposal 5/5-island physics varying island size new JG, TA Structure of island localized modes in Wendelstein 7-X G. Wurden, et al. possible proposal Magnetics-based reconstruction of configurations in the 'iota scan' possible proposal J. Schmitt, et al. Profile-based reconstruction of configurations in the 'iota scan' TA, JG VMEC-compatible radial coordinate inversion of the '5/5' islands in the subtopical configurations J. Schmitt, et al. possible proposal mode activity in islands; calculations with CONTI3/ analytic theory/ CKA /EUTERPE A. K nies, et al. possible proposal 19.02.2025 TG MHD, 03.03.2022
Proposal ideas Topic Subtopic Conf. Possible proponents Comments plasma current evolution; fast convergence of the net toroidal current to the asymptotic bootstrap value employing co-ECCD in the initial phase of the discharge possible proposal equilibrium properties bootstrap current (configuration dependence at comparable plasma parameters, etc.) U. Neuner, et al. possible proposal Modeling of the bootstrap current evolution. V3FIT equilibrium reconstruction of the current, pressure, and kinetic profiles as input parameters to SFINCS, a neoclassical transport calculation. The desired output from SFINCS is the expected bootstrap current profile. With the profile, the Spitzer resistivity and the 3-D geometry information of the plasma column, the current diffusion can be modeled. bootstrap optimization J. Schmitt, et al. possible proposal possible proposal K. Rahbarnia, et al. V3FIT: equilibrium reconstruction including current relaxation modeling improvement and benchmarking of SPEC code as a future replacement of VMEC possible proposal J. Schmitt, et al. J. Schilling, et al. possible proposal 19.02.2025 TG MHD, 03.03.2022
Proposal ideas Topic Subtopic Conf. Proponents Comments Reversed field experiments Tespel / Impurity distribution dynamics Reversal of ExB rotation/ drifts possible proposal possible proposal Bootstrap current and residual ECCD / NBCD Alfvenic mode activity possible proposal possible proposal High performance in reversed field/ density crash ECCD in reversed field vs. normal field possible proposal possible proposal 19.02.2025 TG MHD, 03.03.2022
Proposal ideas Topic Subtopic Conf. Proponents Comments compare mode activity with gyro-kinetic calculations; calculations with the EUTERPE code MHD mode activity & survey possible proposal Subgroup MHD modes [K. Rahbarnia] mode analysis, fast ions, equilibrium reconstruction, NTSS modeling, iota profile, inversion radius, Alfv n continua possible proposal low-frequency spectrum of W7- X studied in the ideal MHD framework modes observation with reflectometers development/ verification of tools for survey of MHD activity possible proposal possible proposal possible proposal 19.02.2025 TG MHD, 03.03.2022
Proposal ideas Topic Subtopic Conf. Proponents Comments ECCD: repetitive central crashes and plasma ending crashes magnetic reconnection instabilities current-crashes (ECCD) possible proposal possible proposal possible proposal possible proposal fast plasma crashes Subgroup MHD modes [K. Rahbarnia] improve the reconstruction and understanding of magnetic diagnostic signals in the presence of fast or transient effects. Understanding the eddy currents would be useful to help inproing various engineering models. resistive MHD calculation of pressure and current driven modes; calculations with the MEGA code gyro-kinetic calculations of current/ pressure driven modes; calculations with the EUTERPE code possible proposal possible proposal magnetic reconnection instabilities; kinetic effects and pressure drive possible proposal magnetic reconnection instabilities; kinetic effects and pressure drive; application of SPEC to post-crash equilibrium magnetic reconnection instabilities; application of CASTOR3D; non-linear 2-fluid cylindrical model possible proposal possible proposal 19.02.2025 TG MHD, 03.03.2022
Thank you very much for your attention and welcome with new ideas! 19.02.2025 TG MHD, 03.03.2022
