Alcator C-Mod - Characteristics - Heating and Current Drive

Heating and Current Drive

Alcator C-Mod uses ion cyclotron range frequencies (ICRF) heating as its primary auxiliary heating source. The source frequency is 80 MHz and the standard minority heating scenarios are: D(H) for 4.4-6.9 T and D(3He) for high field operation (7.3- 8.0 T) . Note that a minority species (Hydrogen or He3) is indicated, and ICRH scenarios use a two component plasma.

Absorption efficiency varies with the minority concentration. It is also possible to transition between minority and mode conversion (MC) heating by varying the minority species concentration. The relative H fraction can be scanned from roughly 2-30% via gas puffing and measured using passive charge exchange . The relative He3 fraction concentration can also be scanned from roughly 2-30% via gas puffing. Phase Contrast Imaging (PCI) can be used to measure the mode converted waves directly in the plasma.

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