Alcator C-Mod Experiments in Support of the ITER Baseline 15 MA Scenario

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Experiments on Alcator C-Mod have addressed several issues for the ITER 15 MA baseline scenario from 2009-2012. Rampup studies show ICRF can save significant V-s, and that an H-mode in the ramp can be utilized to save 50% more. ICRF modifications to li(1) are minimal, although the Te profile is peaked relative to ohmic in the plasma center, and alter sawtooth onset times. Rampdown studies show H-modes can be routinely sustained, avoiding an OH coil over-current associated with the H-L transition, that fast rampdowns are preferred, the density drops with Ip, and that the H-L transition occurs at Ploss/Pthr,LH ~ ... continued below

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Kessel, C. May 7, 2013.

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Description

Experiments on Alcator C-Mod have addressed several issues for the ITER 15 MA baseline scenario from 2009-2012. Rampup studies show ICRF can save significant V-s, and that an H-mode in the ramp can be utilized to save 50% more. ICRF modifications to li(1) are minimal, although the Te profile is peaked relative to ohmic in the plasma center, and alter sawtooth onset times. Rampdown studies show H-modes can be routinely sustained, avoiding an OH coil over-current associated with the H-L transition, that fast rampdowns are preferred, the density drops with Ip, and that the H-L transition occurs at Ploss/Pthr,LH ~ 1.0-1.3 at n/nGr ~ 0.85. Flattop plasmas targeting ITER baseline parameters have been sustained for 20 τE or 8-13 τCR, but only reach H98 ~ 0.6 at n/nGr = 0.85, rising to 0.9 at n/nGr = 0.65.

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  • Nuclear Fusion (May 2013)

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  • Report No.: PPPL-4874
  • Grant Number: DE-ACO2-09CH11466
  • DOI: 10.2172/1090607 | External Link
  • Office of Scientific & Technical Information Report Number: 1090607
  • Archival Resource Key: ark:/67531/metadc828993

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  • May 7, 2013

Added to The UNT Digital Library

  • May 19, 2016, 9:45 a.m.

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  • April 3, 2017, 12:24 a.m.

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Kessel, C. Alcator C-Mod Experiments in Support of the ITER Baseline 15 MA Scenario, report, May 7, 2013; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc828993/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.