Abstract
We developed a new diagnostic system of the hydrogen ice pellets for fueling into plasma devices. The system consists of three parts. They are: a light gate system, a microwave mass detector, and a shadowgraph system. This system provides the pellet velocity, mass and shape, simultaneously. In particular, by using multiple mirror system, the light gate system can achieve high detective probability with high signal to noise ratio for submillimeter pellets. At the results of the bench tests carried out on GAMMA 10 and the Large Helical Device, the light gate system completely detected the pellets used in the bench tests and the pellet velocity was estimated by using this system. Similarly, the shadowgraph system was available for the pellet. The microwave mass detector was found to be applicable. These results show the capability of simultaneous measurement of the pellet parameters using this diagnostic system.
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