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Report on benchmarking of Coppi-Tang model in ASTRA and CORSICA

This report presents a benchmarking study of the Coppi-Tang model in the ASTRA and CORSICA codes. The study compares various input data and simulation results to evaluate the agreement between the two codes. The report also discusses the impact of different calibration factors and heating profiles on the benchmarking results.

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Report on benchmarking of Coppi-Tang model in ASTRA and CORSICA

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  1. Report on benchmarking of Coppi-Tang model in ASTRA and CORSICA Tom Casper, Irina Voitsekhovitch ISM meeting, summary session, December 3, 2010

  2. DIIID OH current ramp up discharge with diagnostics NBI blips (136779) has been selected for benchmarking CORSICA ASTRA POH PNBI, absorbed • input data for ASTRA are taken from the ITPA database • CORSICA is coupled to DIIID data base, the initial data fit is used • slightly different density: lower core density in ASTRA • slightly different fit of Thomson scattering data for Te

  3. Input data: electron density CORSICA (left), ASTRA (right) 1.4 s 0.7 s sqrt(tor.flux) Coppi-Tang ~ ne(0)/ne()

  4. Coppi-Tang model[S C Jardin, M G Bell, N Pomphrey, Nuc. Fusion 33 (1993) 371] Different calibration of the L-mode e and i in ASTRA (i.e. Jardin et al NF 1993) and CORSICA has been found: e(i)_CORSICA = 2.5e(i)_ASTRA. This multiplier has been introduced in ASTRA and used for benchmarking with CORSICA

  5. Current density and safety factor: CORSICA (left), ASTRA (right) 0.7 s, 1.4 s sqrt(tor.flux)

  6. Ohmic heating profiles: CORSICA (left), ASTRA (right) POH = E2 1.4 s 0.7 s sqrt(tor.flux) eCoppi-Tang ~ Pe()/[P(tot or e)(=1) – Prad]

  7. Time evolution of central temperatures in CORSICA (left) and ASTRA (right) Te0 Ti0 simulations (solid) data fit (symbols)

  8. Electron temperature profiles (OH phase) in CORSICA (left) and ASTRA (right) 1.4 s 0.7 s Data fit (dashed) simulations (solid) sqrt(tor.flux)

  9. Summary/conclusions • re-normalised Coppi-Tang model (multiplied by 2.5) provides better agreement between simulated and measured profiles for DIII-D discharge • better agreement between ASTRA and CORSICA simulations is obtained after the re-normalisation of the Coppi-Tang model, but the temperatures are still different • slightly different input data: density (an increase of the ne/reduction of Te in ASTRA would give a better agreement with CORSICA simulations), absorbed NBI waveform • different OH heating power: OH regime is not an ideal regime for benchmarking – auxiliary heated discharge would be desirable for future benchmarking JET ITER-demonstration discharges: 8Coppi-Tang for OH plasmas, (4.7-4.9)Coppi-Tang for NBI and ICRH heated discharges

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