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

M. 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; M. F.F. 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

doi:10.1088/0029-5515/51/10/103028

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

M. 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, M. F.F. Nave, T. H. Osborne, N. Oyama, J. K. Park, N. RamasubramanianH. 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

Research output: Contribution to journal › Article › peer-review

43 Scopus citations

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 language	English
Article number	103028
Journal	Nuclear Fusion
Volume	51
Issue number	10
DOIs	https://doi.org/10.1088/0029-5515/51/10/103028
State	Published - Oct 2011

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1088/0029-5515/51/10/103028

Cite this

Schaffer, M. J., Snipes, J. A., Gohil, P., De Vries, P., Evans, T. E., Fenstermacher, M. E., Gao, X., Garofalo, A. M., Gates, D. A., Greenfield, C. M., Heidbrink, W. W., Kramer, G. J., La Haye, R. J., Liu, S., Loarte, A., Nave, M. F. F., Osborne, T. H., Oyama, N., Park, J. K., ... Zeng, L. (2011). ITER test blanket module error field simulation experiments at DIII-D. Nuclear Fusion, 51(10), Article 103028. https://doi.org/10.1088/0029-5515/51/10/103028

@article{7b6a9598eb8243b3b144d7b06a05c0b9,

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 = "Schaffer, {M. J.} and Snipes, {J. A.} and P. Gohil and {De Vries}, P. and Evans, {T. E.} and Fenstermacher, {M. E.} and X. Gao and Garofalo, {A. M.} and Gates, {D. A.} and Greenfield, {C. M.} and Heidbrink, {W. W.} and Kramer, {G. J.} and {La Haye}, {R. J.} and S. Liu and A. Loarte and Nave, {M. F.F.} and Osborne, {T. H.} and N. Oyama and Park, {J. K.} and N. Ramasubramanian and H. Reimerdes and G. Saibene and A. Salmi and K. Shinohara and Spong, {D. A.} and Solomon, {W. M.} and T. Tala and Zhu, {Y. B.} and Boedo, {J. A.} and V. Chuyanov and Doyle, {E. J.} 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",

year = "2011",

month = oct,

doi = "10.1088/0029-5515/51/10/103028",

language = "English",

volume = "51",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing",

number = "10",

}

Schaffer, MJ, Snipes, JA, Gohil, P, De Vries, P, Evans, TE, Fenstermacher, ME, Gao, X, Garofalo, AM, Gates, DA, Greenfield, CM, Heidbrink, WW, Kramer, GJ, La Haye, RJ, Liu, S, Loarte, A, Nave, MFF, Osborne, TH, Oyama, N, Park, JK, Ramasubramanian, N, Reimerdes, H, Saibene, G, Salmi, A, Shinohara, K, Spong, DA, Solomon, WM, Tala, T, Zhu, YB, Boedo, JA, Chuyanov, V, Doyle, EJ, Jakubowski, M, Jhang, H, Nazikian, RM, Pustovitov, VD, Schmitz, O, Srinivasan, R, Taylor, TS, Wade, MR, You, KI & Zeng, L 2011, 'ITER test blanket module error field simulation experiments at DIII-D', Nuclear Fusion, vol. 51, no. 10, 103028. https://doi.org/10.1088/0029-5515/51/10/103028

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.

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, A.

AU - Shinohara, K.

AU - Spong, D. A.

AU - Solomon, W. M.

AU - Tala, T.

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.

PY - 2011/10

Y1 - 2011/10

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.

UR - http://www.scopus.com/inward/record.url?scp=80052545157&partnerID=8YFLogxK

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

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

M3 - Article

AN - SCOPUS:80052545157

SN - 0029-5515

VL - 51

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 10

M1 - 103028

ER -

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

Abstract

UN SDGs

Access to Document

Other files and links

Fingerprint

Cite this