Author/Authors :
Arnoux، نويسنده , , G. and Andrew، نويسنده , , P. and Beurskens، نويسنده , , M. and Brezinsek، نويسنده , , S. and Challis، نويسنده , , C.D. and Vries، نويسنده , , P. De and Fundamenski، نويسنده , , W. and Gauthier، نويسنده , , E. and Giroud، نويسنده , , C. Dumais-Huber، نويسنده , , A. and Jachmich، نويسنده , , S. and Litaudon، نويسنده , , X. and Pitts، نويسنده , , R.A. and Rimini، نويسنده , , F.، نويسنده ,
Abstract :
Heat loads on the JET MarkIIHD divertor are measured by IR thermography in high triangularity plasmas with edge conditions of advanced tokamak scenarios (AT). AT scenarios operate at low density ( n e , av < 5 × 10 19 m - 3 at JET) to maximise the non inductive current drive, leading to high target temperature ( 20 < T e < 40 eV ), hence high heat loads. Comparisons with a typical baseline inductive scenario ( n e , av ≃ 10 × 10 19 m - 3 ), show that for similar input power ( ≃ 20 MW ) the outer target heat load is higher by a factor 4 in AT scenario, and is above the limit for the ITER-like wall (ILW). Operating long pulses in AT scenarios in the ILW could then be an issue and heat load reduction using impurity seeding is investigated.
