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MAST Error Field Studies T C Hender, G Cunningham and D F Howell EURATOM/UKAEA Fusion Association

MAST Error Field Studies T C Hender, G Cunningham and D F Howell EURATOM/UKAEA Fusion Association Presented by G. Turri. 4 new Error Field Correction Coils installed on MAST. MAST Error Field Experiments. Intrinsic error. Constant Bt=-.55T, Ip=600kA. n e. 8. n e =2.0e19. 6. SXR. 4.

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MAST Error Field Studies T C Hender, G Cunningham and D F Howell EURATOM/UKAEA Fusion Association

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  1. MAST Error Field Studies T C Hender, G Cunningham and D F Howell EURATOM/UKAEA Fusion Association Presented by G. Turri 4 new Error Field Correction Coils installed on MAST MHD Control workshop - Princeton - Nov 2004

  2. MHD Control workshop - Princeton - Nov 2004

  3. MAST Error Field Experiments Intrinsic error Constant Bt=-.55T, Ip=600kA ne 8 ne=2.0e19 6 SXR 4 2 EFC B current [kAt] 0 IEFCC -8 -6 -4 -2 0 2 4 6 8 -2 Da -4 -6 br -8 EFC A current [kAt] Circle radius = field for locked mode Lock time MHD Control workshop - Princeton - Nov 2004

  4. ne 30% lower Locked mode 0.0 0.1 0.2 0.3 0.4 time (s) Error Correction Extends Operating Space No EFCCs, optimal EFCCs Central SXR Ip IEFCC MHD Control workshop - Princeton - Nov 2004

  5. 4 Constant Bt=-0.55, Ip=600kA 3.5 3 2.5 [G] 2 21 B 1.5 1 0.5 0 0 1 2 3 4 5 19 -3 Line ave electron density [10 m ] Density Scaling JET IPB MAST 2.0E-04 F |/B 2,1 r n/nG=0.75higher li |B 1.0E-04 0.0E+00 0.0E+00 5.0E+18 1.0E+19 1.5E+19 2.0E+19 -3 n (m ) e *IPB, NF 1999 MHD Control workshop - Princeton - Nov 2004

  6. Toroidal Field Scaling 7 Bt=0.35 Constant Bt/Ip Bt=0.49 5 Bt=0.60 3 1 EFC B [kAt] -7 -5 -3 -1 1 3 5 7 -1 Need more points! -3 -5 -7 EFC A [kAt] MHD Control workshop - Princeton - Nov 2004

  7. q-Scaling 4 q95 qcyl 3 1.3601 y = 0.7573x [G] 2 21 B 1.1866 y = 0.1986x 1 0 0 2 4 6 8 q , q 95 cyl MHD Control workshop - Princeton - Nov 2004

  8. Conclusions • Error field limits density operation in MAST • New correction system recently installed, works properly • Measured threshold for locking • Error field correction extends operational space • Scaling seems to be consistent with other experiments MHD Control workshop - Princeton - Nov 2004

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