Experimental inference of neutral and impurity transport in Alcator C-Mod using high-resolution x-ray and ultra-violet spectra

Sciortino, Francesco; Howard, N. T.; Reksoatmodjo, R.; Foster, A. R.; Hughes, J. W.; Marmar, E. S.; Miller, M. A.; Mordijck, S.; Odstrčil, T.; Pütterich, T.; Reinke, M. L.; Rice, J. E.; Rodriguez-Fernandez, P.

doi:10.1088/1741-4326/ac32f2

Experimental inference of neutral and impurity transport in Alcator C-Mod using high-resolution x-ray and ultra-violet spectra

Journal Article · Wed Nov 17 23:00:00 EST 2021 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac32f2· OSTI ID:1979401

^[1]; ^[2]; Reksoatmodjo, R. ^[3]; Foster, A. R. ^[4]; ^[2]; Marmar, E. S. ^[2]; Miller, M. A. ^[2]; Mordijck, S. ^[3]; ^[5]; ^[6]; Reinke, M. L. ^[7]; ^[2]; ^[2]

Massachusetts Institute of Technology (MIT), Cambridge, MA (United States); Max-Planck-Institut für Plasmaphysik, Garching (Germany); OSTI
Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
College of William and Mary, Williamsburg, VA (United States)
Center for Astrophysics Harvard & Smithsonian, Cambridge, MA (United States)
General Atomics, San Diego, CA (United States)
Max-Planck-Institut für Plasmaphysik, Garching (Germany)
Commonwealth Fusion Systems, Cambridge, MA (United States)

We present experimental inferences of cross-field impurity transport coefficients for AlcatorC-Mod plasmas without edge-localized modes, leveraging a novel forward model for the entire Ca Kα spectrum, including satellite lines within the spectral range, to compare to high-resolution x-ray imaging crystal spectroscopy (XICS). These measurements are complemented by extreme ultra-violet (EUV) spectroscopy that constrains transport closer to the edge. Using new atomic data sets for both XICS and EUV analysis has enabled consideration of line ratios across both spectral ranges and has increased the accuracy of inferred transport coefficients. Inclusion of charge exchange between edge thermal neutrals and impurities is shown to be extremely important in C-Mod pedestals. Atomic D neutral densities from experimental D Lyα measurements at the midplane are compared to SOLPS-ITER simulations, finding good agreement. Bayesian inferences of impurity transport coefficients are presented for L-, EDA H-, and I-mode discharges, making use of the Aurora package for forward modeling and combining our spectroscopic constraints. Experimentally inferred diffusion profiles are found to match turbulent transport models at midradius within uncertainties, using both quasilinear gyro-fluid TGLF SAT-1 and nonlinear ion-scale gyrokinetic CGYRO simulations. Furthermore, significant discrepancies in convection are observed in some cases, suggesting difficulties in predictions of flat or hollow impurity profiles.

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States); Massachusetts Institute of Technology (MIT), Cambridge, MA (United States); College of William and Mary, Williamsburg, VA (United States); University of California, Oakland, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: FC02-04ER54698; FG02-91ER54109; SC0007880; SC0014264; AC02-05CH11231

OSTI ID:: 1979401

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 12 Vol. 61; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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