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

DIII-D Team

    Research output: Contribution to journalArticleScientificpeer-review

    31 Citations (Scopus)

    Abstract

    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 Δv/v ∼ 60% via non-resonant braking. Changes to global Δn/n, Δβ/β and ΔH 98/H98 were ∼3 times smaller. These effects are stronger at higher β. 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.

    Original languageEnglish
    Article number103028
    Number of pages11
    JournalNuclear Fusion
    Volume51
    Issue number10
    DOIs
    Publication statusPublished - 1 Oct 2011
    MoE publication typeNot Eligible

    Fingerprint

    blankets
    modules
    braking
    locking
    simulation
    toroidal plasmas
    ferromagnetic materials
    field tests
    energetic particles
    extrapolation
    coils
    adjusting
    retarding
    harmonics
    perturbation
    causes
    sensitivity
    profiles

    Cite this

    @article{489830df53f64a3aa8904d315589a487,
    title = "ITER test blanket module error field simulation experiments at DIII-D",
    abstract = "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 Δv/v ∼ 60{\%} via non-resonant braking. Changes to global Δn/n, Δβ/β and ΔH 98/H98 were ∼3 times smaller. These effects are stronger at higher β. 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.",
    author = "M.J. Schaffer and J.A. Snipes and P. Gohil and {de Vries}, P.C. and Evans, {T. E.} and Fenstermacher, {M. E.} and X. Gao and A.M. Garofalo and Gates, {D. A.} and Greenfield, {C. M.} and Heidbrink, {W. W.} and G.J. Kramer and {La Haye}, {R. J.} and S. Liu and A. Loarte and Nave, {M. F.F.} and Osborne, {T. H.} and N. Oyama and J.K. Park and N. Ramasubramanian and H. Reimerdes and G. Saibene and Antti Salmi and K. Shinohara and Spong, {D. A.} and W.M. Solomon and Tuomas Tala and Zhu, {Y. B.} and J.A. Boedo and V. Chuyanov and E.J. Doyle and M. Jakubowski and H. Jhang and Nazikian, {R. M.} and Pustovitov, {V. D.} and O. Schmitz and R. Srinivasan and Taylor, {T. S.} and Wade, {M. R.} and You, {K. I.} and L. Zeng and {DIII-D Team}",
    year = "2011",
    month = "10",
    day = "1",
    doi = "10.1088/0029-5515/51/10/103028",
    language = "English",
    volume = "51",
    journal = "Nuclear Fusion",
    issn = "0029-5515",
    publisher = "Institute of Physics IOP",
    number = "10",

    }

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

    In: Nuclear Fusion, Vol. 51, No. 10, 103028, 01.10.2011.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - ITER test blanket module error field simulation experiments at DIII-D

    AU - Schaffer, M.J.

    AU - Snipes, J.A.

    AU - Gohil, P.

    AU - de Vries, P.C.

    AU - Evans, T. E.

    AU - Fenstermacher, M. E.

    AU - Gao, X.

    AU - Garofalo, A.M.

    AU - Gates, D. A.

    AU - Greenfield, C. M.

    AU - Heidbrink, W. W.

    AU - Kramer, G.J.

    AU - La Haye, R. J.

    AU - Liu, S.

    AU - Loarte, A.

    AU - Nave, M. F.F.

    AU - Osborne, T. H.

    AU - Oyama, N.

    AU - Park, J.K.

    AU - Ramasubramanian, N.

    AU - Reimerdes, H.

    AU - Saibene, G.

    AU - Salmi, Antti

    AU - Shinohara, K.

    AU - Spong, D. A.

    AU - Solomon, W.M.

    AU - Tala, Tuomas

    AU - Zhu, Y. B.

    AU - Boedo, J.A.

    AU - Chuyanov, V.

    AU - Doyle, E.J.

    AU - Jakubowski, M.

    AU - Jhang, H.

    AU - Nazikian, R. M.

    AU - Pustovitov, V. D.

    AU - Schmitz, O.

    AU - Srinivasan, R.

    AU - Taylor, T. S.

    AU - Wade, M. R.

    AU - You, K. I.

    AU - Zeng, L.

    AU - DIII-D Team

    PY - 2011/10/1

    Y1 - 2011/10/1

    N2 - 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 Δv/v ∼ 60% via non-resonant braking. Changes to global Δn/n, Δβ/β and ΔH 98/H98 were ∼3 times smaller. These effects are stronger at higher β. 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.

    AB - 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 Δv/v ∼ 60% via non-resonant braking. Changes to global Δn/n, Δβ/β and ΔH 98/H98 were ∼3 times smaller. These effects are stronger at higher β. 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.

    U2 - 10.1088/0029-5515/51/10/103028

    DO - 10.1088/0029-5515/51/10/103028

    M3 - Article

    AN - SCOPUS:80052545157

    VL - 51

    JO - Nuclear Fusion

    JF - Nuclear Fusion

    SN - 0029-5515

    IS - 10

    M1 - 103028

    ER -