@inproceedings{a2a2042fb11e470bbad35d06917cb4d5,
title = "High-speed repetitive pellet injector for plasma fueling of magnetic confinement fusion devices",
abstract = "The projected fueling requirements of future magnetic confinement devices for controlled thermonuclear research [e.g., the International Thermonuclear Experimental Reactor (ITER)] indicate that a flexible plasma fueling capability is required. This includes a mix of traditional gas puffing and low- and high-velocity deuterium-tritium pellets. Conventional pellet injectors (based on light gas guns or centrifugal accelerators) can reliably provide frozen hydrogen pellets (1- to 6-mm-diam sizes tested) up to approximately 1.3-km/s velocity at the appropriate pellet fueling rates (1 to 10 Hz or greater). For long-pulse operation in a higher velocity regime (>2 km/s), an experiment in collaboration between Oak Ridge National Laboratory (ORNL) and ENEA Frascati is under way. This activity will be carried out in the framework of a collaborative agreement between the U.S. Department of Energy and European Atomic Energy Community - ENEA Association. In this experiment, an existing ORNL hydrogen extruder (equipped with a pellet chambering mechanism/gun barrel assembly) and a Frascati two-stage light gas gun driver have been combined on a test facility at ORNL. Initial testing has been carried out with single deuterium pellets accelerated up to 2.1 km/s with the two-stage driver; in addition, some preliminary repetitive testing (to commission the diagnostics) was performed at reduced speeds, including sequences at 0.5 to 1 Hz and 10 to 30 pellets. The primary objective of this study is to demonstrate repetitive operation (up to approximately 1 Hz) with speeds in the 2- to 3-km/s range. In addition, the strength of extruded hydrogen ice as opposed to that produced in situ by direct condensation in pipe guns can be investigated. The equipment and initial experimental results are described.",
author = "Combs, {S. K.} and Baylor, {L. R.} and Foust, {C. R.} and Gouge, {M. J.} and Milora, {S. L.} and A. Frattolillo and M. Gasparotto and S. Migliori and F. Scaramuzzi and G. Angelone and M. Baldarelli and M. Capobianchi and C. Domma and G. Ronci",
year = "1993",
language = "English",
isbn = "0780314131",
series = "Proceedings - Symposium on Fusion Engineering",
publisher = "Publ by IEEE",
pages = "48--51",
booktitle = "Proceedings - Symposium on Fusion Engineering",
note = "Proceedings of the 15th IEEE/NPSS Symposium on Fusion Engineering ; Conference date: 12-10-1993 Through 12-10-1993",
}