Author/Authors :
Yamada، نويسنده , , H. and Sakamoto، نويسنده , , R. and Viniar، نويسنده , , Elena I. and Oda، نويسنده , , Y. and Kikuchi، نويسنده , , K. and Lukin، نويسنده , , A. and Skoblikov، نويسنده , , S. and Umov، نويسنده , , A. and Takaura، نويسنده , , K. and Onozuka، نويسنده , , M. and Kato، نويسنده , , S. and Sudo، نويسنده , , S.، نويسنده ,
Abstract :
A repetitive pellet injector has been developed for investigation of fueling issues towards the steady-state operation in Large Helical Device (LHD). The goal of this approach is achievement of the plasma operation for longer than 1000 s. A principal technical element of the pellet injector is solidification of hydrogen and extrusion of a solid hydrogen rod through a cryogenic screw extruder cooled by Giffard–McMahon (GM) cryo-coolers. Continuous operation of more than 10 000 pellet launches at 10 Hz has been demonstrated. The reliability of pellet launch exceeds 99%. The pellet mass and velocity, the consumption of propellant gas and quality of pellets have been successfully tested to fit the experimental requirement in LHD.
