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Coupling M3D-C1 to ADAS

Presented at the

M3D-C1 Users Meeting

April 1st, 2024

by

Brendan C. Lyons1

1General Atomics

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Overview

  • M3D-C1 has been coupled to KPRAD, a coronal non-equilibrium model for impurity ionization and radiation
  • Coronal model low-collisionality, so all line excitations result in line radiation
  • Fusion plasmas are typically in the collisional-radiative (CR) regime – some line radiation, some collisionally returned to plasma
  • ADAS provides comprehensive impurity data in CR regime, plus routines for processing it
  • OPEN-ADAS is open-source version, but some data out-of-date

From T.W. Abrams Dissertation, PPPL 2015

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M3D-C1 has been coupled to ADAS two ways

  • Full ADAS
    • Directly link to ADAS libraries on available ADAS-member systems
    • Right now, only PPPL & GA clusters
    • Results checked against ADAS routines for values at given density and temperature with excellent agreement
  • OPEN-ADAS
    • Use OPEN-ADAS data and file-reading routines
    • Use M3D-C1 1D spline routines to interpolate data (slightly different results)
    • Makefile setup to download data and compile open-source routines – can be used on any system

N.B. – OPEN-ADAS has know error in Ne ionization rate, though at high temperature so likely not relevant to real-world scenarios

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Trace Ne impurity test

KPRAD Ne-0 and Ne-1 �ionlization rates are bad

Line radiation lower in CR as expected

ADAS and OPEN-ADAS indistinguishable

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2D pellet test – realistic KSTAR parameters

Higher densities achieved

Delayed radiation peak

More ionization

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Realistic 3D KSTAR simulation – Single mixed pellet

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Realistic 3D KSTAR simulation – Dual mixed pellets

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