Experiments and Simulations of ITER-like Plasmas in Alcator C-Mod

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Alcator C-Mod is performing ITER-like experiments to benchmark and verify projections to 15 MA ELMy H-mode Inductive ITER discharges. The main focus has been on the transient ramp phases. The plasma current in C-Mod is 1.3 MA and toroidal field is 5.4 T. Both Ohmic and ion cyclotron (ICRF) heated discharges are examined. Plasma current rampup experiments have demonstrated that (ICRF and LH) heating in the rise phase can save voltseconds (V-s), as was predicted for ITER by simulations, but showed that the ICRF had no effect on the current profile versus Ohmic discharges. Rampdown experiments show an overcurrent in ... continued below

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Wilson, J. R.; Kessel, C. E.; Wolfe, S.; Hutchinson, I. H.; Bonoli, P.; Fiore, C. et al. September 24, 2010.

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Alcator C-Mod is performing ITER-like experiments to benchmark and verify projections to 15 MA ELMy H-mode Inductive ITER discharges. The main focus has been on the transient ramp phases. The plasma current in C-Mod is 1.3 MA and toroidal field is 5.4 T. Both Ohmic and ion cyclotron (ICRF) heated discharges are examined. Plasma current rampup experiments have demonstrated that (ICRF and LH) heating in the rise phase can save voltseconds (V-s), as was predicted for ITER by simulations, but showed that the ICRF had no effect on the current profile versus Ohmic discharges. Rampdown experiments show an overcurrent in the Ohmic coil (OH) at the H to L transition, which can be mitigated by remaining in H-mode into the rampdown. Experiments have shown that when the EDA H-mode is preserved well into the rampdown phase, the density and temperature pedestal heights decrease during the plasma current rampdown. Simulations of the full C-Mod discharges have been done with the Tokamak Simulation Code (TSC) and the Coppi-Tang energy transport model is used with modified settings to provide the best fit to the experimental electron temperature profile. Other transport models have been examined also. __________________________________________________

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  • IAEA Fusion Energy Conference 2010 Daejon, Korea (October 11-16, 2010)

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  • Report No.: PPPL-4556
  • Grant Number: DE-ACO2-09CH11466
  • Office of Scientific & Technical Information Report Number: 989194
  • Archival Resource Key: ark:/67531/metadc1012825

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  • September 24, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Nov. 6, 2017, 5:46 p.m.

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Wilson, J. R.; Kessel, C. E.; Wolfe, S.; Hutchinson, I. H.; Bonoli, P.; Fiore, C. et al. Experiments and Simulations of ITER-like Plasmas in Alcator C-Mod, article, September 24, 2010; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc1012825/: accessed April 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.