Results of ITER test blanket module mock-up experiments on DIII-D

DIII-DにおけるITERテストブランケットモジュール模擬実験結果

Snipes, J. A.*; Schaffer, M. J.*; Gohil, P.*; de Vries, P.*; Fenstermacher, M. E.*; Evans, T. E.*; Gao, X. M.*; Garofalo, A.*; Gates, D. A.*; Greenfield, C. M.*; Heidbrink, W. W.*; Kramer, G. J.*; Liu, S.*; Loarte, A.*; Nave, M. F. F.*; 大山 直幸; Park, J.-K.*; Ramasubramanian, N.*; Reimerdes, H.*; Saibene, G.*; Salmi, A.*; 篠原 孝司; Spong, D. A.*; Solomon, W. M.*; Tala, T.*; Boedo, J. A.*; Budny, R.*; Chuyanov, V.*; Doyle, E. J.*; Jakubowski, M.*; Jhang, H.*; Nazikian, R. M.*; Pustovitov, V. D.*; Schmitz, O.*; Osborne, T. H.*; Srinivasan, R.*; Taylor, T. S.*; Wade, M. R.*; You, K.-I.*; Zeng, L.*; DIII-Dチーム*

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

磁性体で作られているITERのテストブランケットモジュール(TBM)が作る誤差磁場がプラズマ運転と性能へ与える影響を調べる実験をDIII-Dで実施した。ポロイダル磁場とトロイダル磁場を作る一組のコイルをプラズマ近傍の水平ポートに設置した。TBMコイルは、トロイダル磁場リップルとの総和で5.7%という局所磁場リップルを作り出すことが可能で、この値は1.3トンのITER用TBMが作る局所磁場リップルの4倍に相当する。実験では、トロイダル回転の減少はリップルに敏感であるが、閉じ込め性能への影響では、3%以上の局所磁場リップルで15-18%の減少、1.7%以下では影響はほとんど見られないことがわかった。

A series of experiments was performed on DIII-D to mock-up the field that will be induced in a pair of ferromagnetic Test Blanket Modules (TBMs) in ITER to determine the effects of such error fields on plasma operation and performance. A set of coils producing both poloidal and toroidal fields was placed inside a re-entrant horizontal port close to the plasma. The coils produce a localized ripple due to the toroidal field (TF) + TBM up to 5.7%, which is more than four times that expected from a pair of representative 1.3 ton TBMs in ITER. The experiments show that the reduction in the toroidal rotation is sensitive to the ripple. On the other hand, the confinement is reduced by up to 15-18% for local ripple 3% but is hardly affected at 1.7% local ripple.