DEVELOPMENT AND CHARACTERISTICS OF EIGHT SHOT PELLET INJECTOR FOR HL 1M TOKAMAK

A pneumatic Eight Shot Pellet Injector System（EPI）has been successfully developed, SWIP of CHINA and STU of ROSSIA. After comprehesive engineering commissions the first multishot pellet refueling experiment in China has been carried out on HL 1M Tokamak.In this paper,the development and performance characteristics of EPI were described.The EPI has been capable of making and firing eight pellets with two kinds of diameter（φ1.0mm four pellet and φ1.4 mm four pellet） in great degree of freedom between any guns （5 ms to 10s ）.The velocity of pellets in the range of 0.7 to 1.2 km/s have been reached. Compressed H 2 gas was used as propellant （at pressure from 4 to 6 MPa）. The reliability is more than 90%.