A TECHNIQUE FOR PRODUCING LARGE DUAL-LAYER PELLETS IN SUPPORT OF DISRUPTION MITIGATION EXPERIMENTS

作者：Combs S K^*; Leachman J W; Meitner S J; Baylor L R; Foust C R; Commaux N; Jernigan T C

来源：Fusion Science and Technology, 2011, 60(2): 473-479.

DOI：10.13182/FST60-473

A special single-shot pellet injection system that produces and accelerates large cryogenic pellets (similar to 16 mm diameter and composed of D(2) or Ne) to relatively high speeds (>300 and 600 m/s, respectively) was previously developed at the Oak Ridge National Laboratory. Subsequently, a similar system was installed on DIII-D and used successfully in disruption mitigation experiments. To circumvent some operational issues with injecting the large Ne pellets, a technique has been developed in which a relatively thin layer (0.1 to 1.0 mm) of D(2) is frozen on the inner wall of the pipe-gun barrel, followed by filling the core with solid Ne. A fast solenoid valve operating with a light gas (H(2) or He) at relatively high pressure (similar to 70 bar) provides the force necessary to break away the dual-layer pellet and accelerate it. The technique and the initial laboratory tests are described, as well as the implementation and operational issues for fusion experiments.

• 出版日期2011-8