ITER Test Blanket Module Error Field Experiments at DIII-D

M.J. Schaffer, J.A. Snipes, P. Gohil, Antti Salmi, Tuomas Tala, P.C. de Vries, T. E. Evans, M.E. Fenstermacher, X. Gao, A.M. Garofalo, D. A. Gates, C. M. Greenfield, W. W. Heidbrink, G.J. Kramer, R.J. La Haye, S. Liu, A. Loarte, M.F.F. Nave, T. H. Osborne, N. OyamaJ.K. Park, N. Ramasubramanian, H. Reimerdes, G. Saibene, K. Shinohara, D. A. Spong, W.M. Solomon, J.A. Boedo, V. Chuyanov, E.J. Doyle, M. Jakubowski, H. Jhang, R. M. Nazikian, V. D. Pustovitov, O. Schmitz, R. Srinivasan, T. S. Taylor, M.R. Wade, K. I. You, L. Zeng, DIII-D Team

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific


    Experiments at DIII-D investigated the effects of ferromagnetic error fields similar to those expected from proposed ITER Test Blanket Modules (TBMs). Studied were effects on: plasma rotation and locking; confinement; L-H transition; edge localized mode (ELM) suppression by resonant magnetic perturbations; ELMs and the H-mode pedestal; energetic particle losses; and more. The experiments used a 3-coil mock-up of 2 magnetized ITER TBMs in one ITER equatorial port. The experiments did not reveal any effect likely to preclude ITER operations with a TBM-like error field. The largest effect was slowed plasma toroidal rotation ν across the entire radial profile by as much as Δν/ν0 ~50% via non-resonant braking. Changes to global Δn/n, Δβ/β and ΔH98/H98 were ~3 times smaller. These effects are stronger at higher β and lower ν. Other effects were smaller. The TBM field increased sensitivity to locking by an applied n=1 test field, but it was nulled in an L-mode plasma by re-adjusting the DIII-D n=1 error field compensation system. Numerical modeling by IPEC reproduces the locking semi-quantitatively and predicts similar compensation of locking in H-mode.
    Original languageEnglish
    Title of host publicationProceedings of the 23rd IAEA Fusion Energy Conference
    PublisherInternational Atomic Energy Agency IAEA
    Publication statusPublished - 2010
    MoE publication typeNot Eligible
    Event23rd IAEA Fusion Energy Conference, FEC 2010 - Daejon, Korea, Republic of
    Duration: 10 Oct 201016 Oct 2010


    Conference23rd IAEA Fusion Energy Conference, FEC 2010
    Country/TerritoryKorea, Republic of


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