Title :
Thermal design of GA ECH launcher mirror for long pulse operation
Author :
Baxi, C.B. ; Friend, M.E. ; Doane, J.L. ; Reis, E.E. ; Callis, R.W.
Author_Institution :
Gen. Atomics, San Diego, CA, USA
Abstract :
Each GA ECH launcher mirrors is used to transmit 800 kW of power to the plasma. Until 2000, the pulse length for use of these mirrors was limited to 2 s due to temperatures of the mirrors resulting from 1) a high ratcheted bulk temperature and 2) a large increase in temperature of the mirror during the pulse. A new design was proposed and implemented which has extended the capability of the mirror to 10 s with passive cooling. The important features of the new design are 1) increase in the passive heat transfer rate during cooling and 2) a modified shape of the mirror. The analysis shows that, the new mirrors can be used for 10 s pulses. The new mirrors have been installed in DIII-D, they have been used for up to 2 s pulses.
Keywords :
Tokamak devices; fusion reactor design; mirrors; plasma radiofrequency heating; 800 kW; DIII-D; GA ECH launcher mirror; mirrors; passive heat transfer rate; pulse length; temperature; thermal design; Conductivity; Cooling; Finite element methods; Length measurement; Mirrors; Plasma measurements; Plasma temperature; Plasma waves; Propagation losses; Tokamaks;
Conference_Titel :
Fusion Engineering, 2002. 19th Symposium on
Print_ISBN :
0-7803-7073-2
DOI :
10.1109/FUSION.2002.1027661
