ITER test blanket module error field simulation experiments at DIII-D

TitleITER test blanket module error field simulation experiments at DIII-D
Publication TypeJournal Article
Year of Publication2011
AuthorsM.J Schaffer, J.A Snipes, P. Gohil, P. 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, MFF Nave, T.H Osborne, N. Oyama, J.K Park, N. Ramasubramanian, H. Reimerdes, G. Saibene, A. Salmi, K. Shinohara, D.A Spong, W.M Solomon, T. Tala, Y.B Zhu, 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
JournalNuclear Fusion
Date PublishedOct
Type of ArticleArticle
ISBN Number0029-5515

Experiments at DIII-D investigated the effects of magnetic error fields similar to those expected from proposed ITER test blanket modules (TBMs) containing ferromagnetic material. Studied were effects on: plasma rotation and locking, confinement, L-H transition, the H-mode pedestal, edge localized modes (ELMs) and ELM suppression by resonant magnetic perturbations, energetic particle losses, and more. The experiments used a purpose-built three-coil mock-up of two magnetized ITER TBMs in one ITER equatorial port. The largest effect was a reduction in plasma toroidal rotation velocity v across the entire radial profile by as much as Delta upsilon/upsilon similar to 60% via non-resonant braking. Changes to global Delta n/n, Delta beta/beta and Delta H(98)/H(98) were similar to 3 times smaller. These effects are stronger at higher beta. Other effects were smaller. The TBM field increased sensitivity to locking by an applied known n = 1 test field in both L-and H-mode plasmas. Locked mode tolerance was completely restored in L-mode by re-adjusting the DIII-D n = 1 error field compensation system. Numerical modelling by IPEC reproduces the rotation braking and locking semi-quantitatively, and identifies plasma amplification of a few n = 1 Fourier harmonics as the main cause of braking. IPEC predicts that TBM braking in H-mode may be reduced by n = 1 control. Although extrapolation from DIII-D to ITER is still an open issue, these experiments suggest that a TBM-like error field will produce only a few potentially troublesome problems, and that they might be made acceptably small.







Alternate TitleNucl. Fusion

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