Alternate Concepts for Generating High Speed DT Pellets for Fueling ITER
نویسندگان
چکیده
There is a growing concern that the velocity of the DT-ice pellets being proposed to fuel ITER will not have the velocity to effectively penetrate through the pedestal of the plasma edge, because with velocities of only 300 m/s, high field side launched pellets will only penetrate to € r /a = 0.90, which may not be adequate for fueling. The likelihood of increasing the pellet velocity is problematic, since the forces on the ice pellet as it goes around bends causes the pellets to disintegrate at velocities above 300 m/s. To achieve deeper penetration, either the pellet needs to have its velocity increased after it has passed the last bend, or the pellet has to be made stronger to survive the increased forces higher velocities create. One method toward higher velocity is to accelerate the DT-ice pellets using microwave power in the last meter of the guide tube after the last bend. A second method to reach higher velocities is to increase the strength of the ice pellets using the technologies developed in the production of the fuel pellets used in Inertial Confinement Fusion. That is to either encapsulate the pellet inside a solid shell of either metal or plastic, or to stiffen the ice by integrating it into a plastic foam sphere. Analysis indicates a plastic shell will increase the strength of a DT Ice pellet by a factor of 100. Bench tests of the microwave pellet acceleration have been performed and are reported below.
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