Performance characterization of pneumatic single pellet injection system

D. D. Schuresko, S. L. Milora, J. T. Hogan, C. A. Foster, S. K. Combs
1983 Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films  
COLT 1 -f; 21 0 2 n •'! 1 r r r •: 001954 ABSTRACT The Oak Ridge National Laboratory single-shot pellet injector, which has been used in plasma fueling experiments on ISX and PDX, has been upgraded and extensively instrumented in order to study the gas dynamics of pneumatic pellet injection. An improved pellet transport line was developed which utilizes a 0.3-cm-diam by 100-cm-long guide tube. Pellet gun performance was characterized by measurements of breech and muzzle dynamic pressures and by
more » ... ic pressures and by pellet velocity and mass determinations. Velocities up to 1.4 km/s were achieved for intact hydrogen pellets using hydrogen propellant at 5-MPa breech pressure. These data have been compared with new pellet acceleration calculations which include the effects of propellant friction, heat transfer, timedependent boundary conditions, and finite gun geometry. These results provide a basis for the extrapolation of present-day pneumatic injection system performance to velocities in excess of 2 km/s.
doi:10.1116/1.572162 fatcat:feou2hfyrrc3hoakhli4anmvyi