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

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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",
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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

VL - 51

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

IS - 10

M1 - 103028

ER -